block: optimize zero writes with bdrv_write_zeroes
this patch tries to optimize zero write requests by automatically using bdrv_write_zeroes if it is supported by the format. This significantly speeds up file system initialization and should speed zero write test used to test backend storage performance. I ran the following 2 tests on my internal SSD with a 50G QCOW2 container and on an attached iSCSI storage. a) mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 /dev/vdX QCOW2 [off] [on] [unmap] ----- runtime: 14secs 1.1secs 1.1secs filesize: 937M 18M 18M iSCSI [off] [on] [unmap] ---- runtime: 9.3s 0.9s 0.9s b) dd if=/dev/zero of=/dev/vdX bs=1M oflag=direct QCOW2 [off] [on] [unmap] ----- runtime: 246secs 18secs 18secs filesize: 51G 192K 192K throughput: 203M/s 2.3G/s 2.3G/s iSCSI* [off] [on] [unmap] ---- runtime: 8mins 45secs 33secs throughput: 106M/s 1.2G/s 1.6G/s allocated: 100% 100% 0% * The storage was connected via an 1Gbit interface. It seems to internally handle writing zeroes via WRITESAME16 very fast. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Lieven
Kevin Wolf
parent
82a402e99f
commit
465bee1da8
9
block.c
9
block.c
@ -3289,6 +3289,15 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
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ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req);
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if (!ret && bs->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF &&
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!(flags & BDRV_REQ_ZERO_WRITE) && drv->bdrv_co_write_zeroes &&
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qemu_iovec_is_zero(qiov)) {
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flags |= BDRV_REQ_ZERO_WRITE;
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if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) {
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flags |= BDRV_REQ_MAY_UNMAP;
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}
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}
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if (ret < 0) {
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/* Do nothing, write notifier decided to fail this request */
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} else if (flags & BDRV_REQ_ZERO_WRITE) {
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@ -50,6 +50,7 @@ BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs)
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}
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info->backing_file_depth = bdrv_get_backing_file_depth(bs);
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info->detect_zeroes = bs->detect_zeroes;
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if (bs->io_limits_enabled) {
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ThrottleConfig cfg;
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24
blockdev.c
24
blockdev.c
@ -343,6 +343,7 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
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QemuOpts *opts;
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const char *id;
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bool has_driver_specific_opts;
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BlockdevDetectZeroesOptions detect_zeroes;
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BlockDriver *drv = NULL;
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/* Check common options by copying from bs_opts to opts, all other options
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@ -471,6 +472,24 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
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}
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}
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detect_zeroes =
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parse_enum_option(BlockdevDetectZeroesOptions_lookup,
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qemu_opt_get(opts, "detect-zeroes"),
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BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
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BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
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&error);
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if (error) {
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error_propagate(errp, error);
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goto early_err;
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}
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if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
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!(bdrv_flags & BDRV_O_UNMAP)) {
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error_setg(errp, "setting detect-zeroes to unmap is not allowed "
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"without setting discard operation to unmap");
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goto early_err;
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}
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/* init */
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dinfo = g_malloc0(sizeof(*dinfo));
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dinfo->id = g_strdup(qemu_opts_id(opts));
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@ -481,6 +500,7 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
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}
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dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
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dinfo->bdrv->read_only = ro;
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dinfo->bdrv->detect_zeroes = detect_zeroes;
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dinfo->refcount = 1;
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if (serial != NULL) {
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dinfo->serial = g_strdup(serial);
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@ -2474,6 +2494,10 @@ QemuOptsList qemu_common_drive_opts = {
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.name = "copy-on-read",
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.type = QEMU_OPT_BOOL,
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.help = "copy read data from backing file into image file",
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},{
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.name = "detect-zeroes",
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.type = QEMU_OPT_STRING,
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.help = "try to optimize zero writes (off, on, unmap)",
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},
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{ /* end of list */ }
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},
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5
hmp.c
5
hmp.c
@ -341,6 +341,11 @@ void hmp_info_block(Monitor *mon, const QDict *qdict)
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info->value->inserted->backing_file_depth);
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}
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if (info->value->inserted->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF) {
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monitor_printf(mon, " Detect zeroes: %s\n",
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BlockdevDetectZeroesOptions_lookup[info->value->inserted->detect_zeroes]);
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}
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if (info->value->inserted->bps
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|| info->value->inserted->bps_rd
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|| info->value->inserted->bps_wr
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@ -364,6 +364,7 @@ struct BlockDriverState {
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BlockJob *job;
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QDict *options;
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BlockdevDetectZeroesOptions detect_zeroes;
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};
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int get_tmp_filename(char *filename, int size);
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@ -942,6 +942,8 @@
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# @encryption_key_missing: true if the backing device is encrypted but an
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# valid encryption key is missing
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#
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# @detect_zeroes: detect and optimize zero writes (Since 2.1)
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#
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# @bps: total throughput limit in bytes per second is specified
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#
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# @bps_rd: read throughput limit in bytes per second is specified
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@ -977,6 +979,7 @@
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'data': { 'file': 'str', '*node-name': 'str', 'ro': 'bool', 'drv': 'str',
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'*backing_file': 'str', 'backing_file_depth': 'int',
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'encrypted': 'bool', 'encryption_key_missing': 'bool',
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'detect_zeroes': 'BlockdevDetectZeroesOptions',
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'bps': 'int', 'bps_rd': 'int', 'bps_wr': 'int',
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'iops': 'int', 'iops_rd': 'int', 'iops_wr': 'int',
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'image': 'ImageInfo',
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@ -4254,6 +4257,22 @@
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{ 'enum': 'BlockdevDiscardOptions',
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'data': [ 'ignore', 'unmap' ] }
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##
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# @BlockdevDetectZeroesOptions
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#
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# Describes the operation mode for the automatic conversion of plain
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# zero writes by the OS to driver specific optimized zero write commands.
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#
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# @off: Disabled (default)
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# @on: Enabled
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# @unmap: Enabled and even try to unmap blocks if possible. This requires
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# also that @BlockdevDiscardOptions is set to unmap for this device.
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#
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# Since: 2.1
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##
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{ 'enum': 'BlockdevDetectZeroesOptions',
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'data': [ 'off', 'on', 'unmap' ] }
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##
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# @BlockdevAioOptions
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#
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@ -4306,20 +4325,22 @@
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# Options that are available for all block devices, independent of the block
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# driver.
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#
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# @driver: block driver name
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# @id: #optional id by which the new block device can be referred to.
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# This is a required option on the top level of blockdev-add, and
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# currently not allowed on any other level.
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# @node-name: #optional the name of a block driver state node (Since 2.0)
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# @discard: #optional discard-related options (default: ignore)
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# @cache: #optional cache-related options
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# @aio: #optional AIO backend (default: threads)
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# @rerror: #optional how to handle read errors on the device
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# (default: report)
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# @werror: #optional how to handle write errors on the device
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# (default: enospc)
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# @read-only: #optional whether the block device should be read-only
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# (default: false)
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# @driver: block driver name
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# @id: #optional id by which the new block device can be referred to.
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# This is a required option on the top level of blockdev-add, and
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# currently not allowed on any other level.
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# @node-name: #optional the name of a block driver state node (Since 2.0)
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# @discard: #optional discard-related options (default: ignore)
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# @cache: #optional cache-related options
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# @aio: #optional AIO backend (default: threads)
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# @rerror: #optional how to handle read errors on the device
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# (default: report)
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# @werror: #optional how to handle write errors on the device
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# (default: enospc)
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# @read-only: #optional whether the block device should be read-only
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# (default: false)
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# @detect-zeroes: #optional detect and optimize zero writes (Since 2.1)
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# (default: off)
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#
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# Since: 1.7
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##
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@ -4332,7 +4353,8 @@
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'*aio': 'BlockdevAioOptions',
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'*rerror': 'BlockdevOnError',
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'*werror': 'BlockdevOnError',
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'*read-only': 'bool' } }
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'*read-only': 'bool',
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'*detect-zeroes': 'BlockdevDetectZeroesOptions' } }
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##
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# @BlockdevOptionsFile
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@ -414,6 +414,7 @@ DEF("drive", HAS_ARG, QEMU_OPTION_drive,
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" [,serial=s][,addr=A][,rerror=ignore|stop|report]\n"
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" [,werror=ignore|stop|report|enospc][,id=name][,aio=threads|native]\n"
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" [,readonly=on|off][,copy-on-read=on|off]\n"
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" [,detect-zeroes=on|off|unmap]\n"
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" [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]]\n"
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" [[,iops=i]|[[,iops_rd=r][,iops_wr=w]]]\n"
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" [[,bps_max=bm]|[[,bps_rd_max=rm][,bps_wr_max=wm]]]\n"
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@ -475,6 +476,11 @@ Open drive @option{file} as read-only. Guest write attempts will fail.
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@item copy-on-read=@var{copy-on-read}
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@var{copy-on-read} is "on" or "off" and enables whether to copy read backing
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file sectors into the image file.
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@item detect-zeroes=@var{detect-zeroes}
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@var{detect-zeroes} is "off", "on" or "unmap" and enables the automatic
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conversion of plain zero writes by the OS to driver specific optimized
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zero write commands. You may even choose "unmap" if @var{discard} is set
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to "unmap" to allow a zero write to be converted to an UNMAP operation.
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@end table
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By default, the @option{cache=writeback} mode is used. It will report data
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@ -2032,6 +2032,8 @@ Each json-object contain the following:
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- "iops_rd_max": read I/O operations max (json-int)
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- "iops_wr_max": write I/O operations max (json-int)
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- "iops_size": I/O size when limiting by iops (json-int)
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- "detect_zeroes": detect and optimize zero writing (json-string)
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- Possible values: "off", "on", "unmap"
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- "image": the detail of the image, it is a json-object containing
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the following:
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- "filename": image file name (json-string)
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@ -2108,6 +2110,7 @@ Example:
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"iops_rd_max": 0,
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"iops_wr_max": 0,
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"iops_size": 0,
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"detect_zeroes": "on",
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"image":{
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"filename":"disks/test.qcow2",
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"format":"qcow2",
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@ -6,7 +6,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
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Testing: -drive file=TEST_DIR/t.qcow2,format=qcow2,if=none,id=disk -device virtio-blk-pci,drive=disk,id=virtio0
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QMP_VERSION
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{"return": {}}
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{"return": [{"io-status": "ok", "device": "disk", "locked": false, "removable": false, "inserted": {"iops_rd": 0, "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "type": "unknown"}, {"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}]}
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{"return": [{"io-status": "ok", "device": "disk", "locked": false, "removable": false, "inserted": {"iops_rd": 0, "detect_zeroes": "off", "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "type": "unknown"}, {"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}]}
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{"return": {}}
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{"return": {}}
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{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral/virtio0/virtio-backend"}}
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@ -24,7 +24,7 @@ QMP_VERSION
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Testing: -drive file=TEST_DIR/t.qcow2,format=qcow2,if=none,id=disk
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QMP_VERSION
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{"return": {}}
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{"return": [{"device": "disk", "locked": false, "removable": true, "inserted": {"iops_rd": 0, "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "tray_open": false, "type": "unknown"}, {"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}]}
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{"return": [{"device": "disk", "locked": false, "removable": true, "inserted": {"iops_rd": 0, "detect_zeroes": "off", "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "tray_open": false, "type": "unknown"}, {"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}]}
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{"return": {}}
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{"return": {}}
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{"return": {}}
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@ -44,7 +44,7 @@ Testing:
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QMP_VERSION
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{"return": {}}
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{"return": "OK\r\n"}
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{"return": [{"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "disk", "locked": false, "removable": true, "inserted": {"iops_rd": 0, "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "tray_open": false, "type": "unknown"}]}
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{"return": [{"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "disk", "locked": false, "removable": true, "inserted": {"iops_rd": 0, "detect_zeroes": "off", "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "tray_open": false, "type": "unknown"}]}
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{"return": {}}
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{"return": {}}
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{"return": {}}
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@ -64,14 +64,14 @@ Testing:
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QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": [{"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "disk", "locked": false, "removable": true, "inserted": {"iops_rd": 0, "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "tray_open": false, "type": "unknown"}]}
|
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{"return": [{"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "disk", "locked": false, "removable": true, "inserted": {"iops_rd": 0, "detect_zeroes": "off", "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "tray_open": false, "type": "unknown"}]}
|
||||
{"return": {}}
|
||||
{"return": {}}
|
||||
{"return": {}}
|
||||
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral/virtio0/virtio-backend"}}
|
||||
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "DEVICE_DELETED", "data": {"device": "virtio0", "path": "/machine/peripheral/virtio0"}}
|
||||
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "RESET"}
|
||||
{"return": [{"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"io-status": "ok", "device": "disk", "locked": false, "removable": true, "inserted": {"iops_rd": 0, "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "tray_open": false, "type": "unknown"}]}
|
||||
{"return": [{"io-status": "ok", "device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false, "removable": true, "tray_open": false, "type": "unknown"}, {"io-status": "ok", "device": "disk", "locked": false, "removable": true, "inserted": {"iops_rd": 0, "detect_zeroes": "off", "image": {"virtual-size": 134217728, "filename": "TEST_DIR/t.qcow2", "cluster-size": 65536, "format": "qcow2", "actual-size": SIZE, "format-specific": {"type": "qcow2", "data": {"compat": "1.1", "lazy-refcounts": false}}, "dirty-flag": false}, "iops_wr": 0, "ro": false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0, "encrypted": false, "bps": 0, "bps_rd": 0, "file": "TEST_DIR/t.qcow2", "encryption_key_missing": false}, "tray_open": false, "type": "unknown"}]}
|
||||
{"return": {}}
|
||||
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN"}
|
||||
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "ide1-cd0", "tray-open": true}}
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user