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Peter Lieven 465bee1da8 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>
2014-05-19 13:42:27 +02:00
..
sample_images block: add test for vhdx image created by Disk2VHD 2014-05-19 11:36:48 +02:00
.gitignore .gitignore: ignore tests/qemu-iotests/socket_scm_helper 2013-10-01 16:06:07 +04:00
001 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
001.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
002 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
002.out qemu-iotests: A few more bdrv_pread/pwrite tests 2013-04-15 08:26:18 +02:00
003 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
003.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
004 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
004.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
005 qemu-iotests: Don't run 005 on vmdk split formats 2014-02-14 18:05:39 +01:00
005.out iotests: fix error in 005 2012-04-19 15:48:52 +02:00
006 qemu-iotests: add support for rbd and sheepdog protocols 2012-02-23 10:29:46 +01:00
006.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
007 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
007.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
008 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
008.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
009 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
009.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
010 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
010.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
011 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
011.out qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
012 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
012.out qemu-io: correctly print non-integer values as decimals 2012-05-10 10:32:12 +02:00
013 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
013.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
014 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
014.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
015 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
015.out qemu-iotests: Always filter cluster_size out in _make_test_img 2012-04-19 15:48:52 +02:00
016 qemu-iotests: enable test 016 and 025 to work with NFS protocol 2014-02-09 09:12:38 +01:00
016.out qemu-io: correctly print non-integer values as decimals 2012-05-10 10:32:12 +02:00
017 qemu-iotests: Add _unsupported_imgopts for vmdk subformats 2014-01-22 12:07:16 +01:00
017.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
018 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
018.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
019 block: qemu-iotests: make test 019 and 086 work with spaced pathnames 2014-04-29 16:19:37 +02:00
019.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
020 qemu-iotests: blacklist test 020 for NFS protocol 2014-02-09 09:12:38 +01:00
020.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
021 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
021.out qemu-iotests: test invalid pattern argument handling in qemu-io 2012-02-22 16:17:02 +01:00
022 qemu-iotests: add support for rbd and sheepdog protocols 2012-02-23 10:29:46 +01:00
022.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
023 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
023.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
024 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
024.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
025 qemu-iotests: enable test 016 and 025 to work with NFS protocol 2014-02-09 09:12:38 +01:00
025.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
026 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
026.out qcow2: Don't rely on free_cluster_index in alloc_refcount_block() (CVE-2014-0147) 2014-04-01 15:21:03 +02:00
026.out.nocache qemu-iotests: Correct 026 output 2013-10-07 13:23:19 +02:00
027 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
027.out qemu-io: correctly print non-integer values as decimals 2012-05-10 10:32:12 +02:00
028 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
028.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
029 qcow2: Fix L1 allocation size in qcow2_snapshot_load_tmp() (CVE-2014-0145) 2014-04-01 15:22:35 +02:00
029.out qcow2: Fix L1 allocation size in qcow2_snapshot_load_tmp() (CVE-2014-0145) 2014-04-01 15:22:35 +02:00
030 qemu-iotests: Fix blkdebug in VM drive in 030 2014-05-19 11:36:49 +02:00
030.out qemu-iotests: add tests for streaming error handling 2012-09-28 19:40:56 +02:00
031 Revert "iotests: Use configured python" 2014-05-15 13:41:19 +01:00
031.out qcow2: Add corrupt bit 2013-08-30 15:48:43 +02:00
032 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
032.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
033 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
033.out qemu-io: correctly print non-integer values as decimals 2012-05-10 10:32:12 +02:00
034 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
034.out qemu-iotests: Test backing file COW with zero clusters 2012-04-20 15:57:30 +02:00
035 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
035.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
036 Revert "iotests: Use configured python" 2014-05-15 13:41:19 +01:00
036.out qcow2: Add corrupt bit 2013-08-30 15:48:43 +02:00
037 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
037.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
038 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
038.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
039 qemu-iotests: Fix core dump suppression in test 039 2014-05-19 11:36:49 +02:00
039.out qemu-iotests: Fix core dump suppression in test 039 2014-05-19 11:36:49 +02:00
040 qemu-iotests: Drop assert_no_active_commit in case 040 2014-01-31 22:05:03 +01:00
040.out qemu-iotests: add relative backing file tests for block-commit (040) 2012-10-24 10:26:19 +02:00
041 qemu-iotests: Fix test 041 2013-11-27 07:53:32 -08:00
041.out qemu-iotests: Fix test 041 2013-11-27 07:53:32 -08:00
042 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
042.out qemu-iotests: Test qemu-img operation on zero size image 2012-10-24 10:26:18 +02:00
043 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
043.out qemu-iotests: Add 043 backing file chain infinite loop test 2012-10-24 10:26:19 +02:00
044 qemu-iotests: qcow2: Test growing large refcount table 2012-11-14 18:19:21 +01:00
044.out qcow2: Don't rely on free_cluster_index in alloc_refcount_block() (CVE-2014-0147) 2014-04-01 15:21:03 +02:00
045 qemu-iotests: add tests for runtime fd passing via SCM rights 2013-09-12 10:12:47 +02:00
045.out qemu-iotests: add tests for runtime fd passing via SCM rights 2013-09-12 10:12:47 +02:00
046 qcow2: Set zero flag for discarded clusters 2014-02-21 21:02:21 +01:00
046.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
047 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
047.out qemu-iotests: Filter out 'qemu-io> ' prompt 2013-11-29 17:41:13 +01:00
048 qemu-iotests: Split qcow2 only cases in 048 2013-12-04 14:31:39 +01:00
048.out qemu-iotests: Split qcow2 only cases in 048 2013-12-04 14:31:39 +01:00
049 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
049.out qemu-iotests: Adjustments due to error propagation 2013-09-12 10:12:48 +02:00
050 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
050.out qemu-iotests: add tests for rebasing zero clusters 2013-03-15 16:07:51 +01:00
051 block: Fix open flags with BDRV_O_SNAPSHOT 2014-05-09 20:57:31 +02:00
051.out block: Fix open flags with BDRV_O_SNAPSHOT 2014-05-09 20:57:31 +02:00
052 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
052.out qemu-iotests: add 052 BDRV_O_SNAPSHOT test 2013-03-19 11:48:37 +01:00
053 qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage 2013-09-27 11:10:45 +02:00
053.out qemu-iotests: add 053 unaligned compressed image size test 2013-04-22 11:37:12 +02:00
054 Revert "iotests: Use configured python" 2014-05-15 13:41:19 +01:00
054.out qemu-iotests: Adjustments due to error propagation 2013-09-12 10:12:48 +02:00
055 qemu-iotests: Make test case 030, 040 and 055 deterministic 2013-11-29 13:40:37 +01:00
055.out Add tests for sync modes 'TOP' and 'NONE' 2013-07-26 22:01:31 +02:00
056 qemu-iotests: Improve and make use of QMPTestCase.wait_until_completed() 2014-04-25 18:05:05 +02:00
056.out Add tests for sync modes 'TOP' and 'NONE' 2013-07-26 22:01:31 +02:00
057 qemu-iotests: add 057 internal snapshot for block device test case 2013-09-12 10:12:47 +02:00
057.out qemu-iotests: add 057 internal snapshot for block device test case 2013-09-12 10:12:47 +02:00
058 qemu-iotests: add test for snapshot in qemu-img convert 2013-12-04 15:19:00 +01:00
058.out qemu-iotests: add test for snapshot in qemu-img convert 2013-12-04 15:19:00 +01:00
059 qemu-iotests: Test converting to streamOptimized from small cluster size 2014-05-09 13:32:17 +02:00
059.out qemu-iotests: Test converting to streamOptimized from small cluster size 2014-05-09 13:32:17 +02:00
060 Revert "iotests: Use configured python" 2014-05-15 13:41:19 +01:00
060.out iotests: Test corruption during COW request 2014-03-13 14:23:27 +01:00
061 Revert "iotests: Use configured python" 2014-05-15 13:41:19 +01:00
061.out qemu-iotests: Preallocated zero clusters in 061 2013-09-27 11:16:36 +02:00
062 qemu-iotests: Snapshotting zero clusters 2013-08-30 15:28:52 +02:00
062.out qemu-iotests: Snapshotting zero clusters 2013-08-30 15:28:52 +02:00
063 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
063.out add qemu-img convert -n option (skip target volume creation) 2013-09-06 15:25:07 +02:00
064 block: qemu-iotests for vhdx, add write test support 2013-11-07 13:58:59 +01:00
064.out block: qemu-iotests for vhdx, add write test support 2013-11-07 13:58:59 +01:00
065 Revert "iotests: Use configured python" 2014-05-15 13:41:19 +01:00
065.out qemu-iotests: Additional info from qemu-img info 2013-10-11 16:49:50 +02:00
066 qemu-iotests: Discard preallocated zero clusters 2013-10-11 16:49:59 +02:00
066.out qemu-iotests: Discard preallocated zero clusters 2013-10-11 16:49:59 +02:00
067 qemu-iotests: Filter out actual image size in 067 2013-11-07 13:53:30 +01:00
067.out block: optimize zero writes with bdrv_write_zeroes 2014-05-19 13:42:27 +02:00
068 qemu-iotests: Test for loading VM state from qcow2 2013-10-25 11:08:20 +02:00
068.out qemu-iotests: Test for loading VM state from qcow2 2013-10-25 11:08:20 +02:00
069 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
069.out block: Print its file name if backing file opening failed 2013-11-14 13:09:06 +01:00
070 block: add test for vhdx image created by Disk2VHD 2014-05-19 11:36:48 +02:00
070.out block: add test for vhdx image created by Disk2VHD 2014-05-19 11:36:48 +02:00
071 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
071.out iotests: Test new blkdebug/blkverify interface 2014-01-22 12:07:18 +01:00
072 qemu-iotests: change _supported_proto to file for various tests 2014-02-09 09:12:38 +01:00
072.out iotests: Test file format nesting 2014-01-22 12:07:18 +01:00
073 qemu-iotests: Test qcow2 count_contiguous_clusters() 2013-11-15 13:37:43 +01:00
073.out qemu-iotests: Test qcow2 count_contiguous_clusters() 2013-11-15 13:37:43 +01:00
074 qemu-iotests: Split qcow2 only cases in 048 2013-12-04 14:31:39 +01:00
074.out qemu-iotests: Split qcow2 only cases in 048 2013-12-04 14:31:39 +01:00
075 block/cloop: fix offsets[] size off-by-one 2014-04-01 13:59:47 +02:00
075.out block/cloop: fix offsets[] size off-by-one 2014-04-01 13:59:47 +02:00
076 parallels: Sanity check for s->tracks (CVE-2014-0142) 2014-04-01 15:22:35 +02:00
076.out parallels: Sanity check for s->tracks (CVE-2014-0142) 2014-04-01 15:22:35 +02:00
077 qemu-iotest: Make 077 raw-only 2014-02-09 09:12:38 +01:00
077.out qemu-iotests: Test pwritev RMW logic 2014-01-24 17:40:25 +01:00
078 bochs: Fix catalog size check 2014-04-11 13:59:49 +02:00
078.out bochs: Fix catalog size check 2014-04-11 13:59:49 +02:00
079 qemu-iotests: add test for qcow2 preallocation with different cluster sizes 2014-02-09 09:12:39 +01:00
079.out qemu-iotests: add test for qcow2 preallocation with different cluster sizes 2014-02-09 09:12:39 +01:00
080 qcow2: Check maximum L1 size in qcow2_snapshot_load_tmp() (CVE-2014-0143) 2014-04-01 15:22:35 +02:00
080.out qcow2: Check maximum L1 size in qcow2_snapshot_load_tmp() (CVE-2014-0143) 2014-04-01 15:22:35 +02:00
081 qemu-io-test: Disable Quorum test when not compiled in. 2014-02-28 18:59:07 +01:00
081.out qmp: Make Quorum error events more palatable. 2014-02-28 18:59:06 +01:00
082 qemu-iotests: Check qemu-img command line parsing 2014-02-21 22:10:31 +01:00
082.out qemu-iotests: Check qemu-img command line parsing 2014-02-21 22:10:31 +01:00
083 Revert "iotests: Use configured python" 2014-05-15 13:41:19 +01:00
083.out qemu-iotests: add 083 NBD client disconnect tests 2014-03-14 16:29:02 +01:00
084 block: vdi bounds check qemu-io tests 2014-04-01 15:22:35 +02:00
084.out block: Catch integer overflow in bdrv_rw_co() 2014-04-22 11:57:02 +02:00
085 block: qemu-iotests - update 085 to use common.qemu 2014-05-09 20:57:32 +02:00
085.out block: qemu-iotests 085 - live snapshots tests 2014-03-07 11:36:12 +01:00
086 block: qemu-iotests: make test 019 and 086 work with spaced pathnames 2014-04-29 16:19:37 +02:00
086.out qemu-iotests: Test progress output for conversion 2014-03-05 15:58:32 +01:00
087 qemu-iotests: Check common namespace for id and node-name 2014-04-22 12:12:30 +02:00
087.out qemu-iotests: Check common namespace for id and node-name 2014-04-22 12:12:30 +02:00
088 vpc: Validate block size (CVE-2014-0142) 2014-04-01 13:59:47 +02:00
088.out vpc: Validate block size (CVE-2014-0142) 2014-04-01 13:59:47 +02:00
089 iotests: Add test for the JSON protocol 2014-05-19 11:36:49 +02:00
089.out iotests: Add test for the JSON protocol 2014-05-19 11:36:49 +02:00
090 iotests: Discarding compressed clusters on qcow2 2014-04-29 16:39:51 +02:00
090.out iotests: Discarding compressed clusters on qcow2 2014-04-29 16:39:51 +02:00
091 block: qemu-iotests - test for live migration 2014-05-09 20:57:32 +02:00
091.out block: qemu-iotests - test for live migration 2014-05-09 20:57:32 +02:00
092 qcow1: Stricter backing file length check 2014-05-19 11:36:49 +02:00
092.out qcow1: Stricter backing file length check 2014-05-19 11:36:49 +02:00
check Revert "iotests: Use configured python" 2014-05-15 13:41:19 +01:00
common parallels: Fix catalog size integer overflow (CVE-2014-0143) 2014-04-01 15:22:35 +02:00
common.config qemu-iotests: Add basic ability to use binary sample images 2013-09-27 10:59:07 +02:00
common.filter qemu-iotests: Fix core dump suppression in test 039 2014-05-19 11:36:49 +02:00
common.pattern block: qemu-iotests, add quotes to $TEST_IMG usage io pattern tests 2013-11-07 13:53:31 +01:00
common.qemu block: qemu-iotests - add common.qemu, for bash-controlled qemu tests 2014-05-09 20:57:32 +02:00
common.rc block: qemu-iotests - fix image cleanup when using spaced pathnames 2014-04-29 16:19:33 +02:00
COPYING qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
group qcow1: Check maximum cluster size 2014-05-19 11:36:49 +02:00
iotests.py qemu-iotests: Improve and make use of QMPTestCase.wait_until_completed() 2014-04-25 18:05:05 +02:00
Makefile qemu-iotests: Initial import into the public repository. 2012-02-22 16:15:22 +01:00
nbd-fault-injector.py tests: add nbd-fault-injector.py utility 2014-03-14 16:28:28 +01:00
qcow2.py qcow2.py: Subcommand for changing header fields 2013-05-24 16:17:55 +02:00
qed.py qemu-iotests: add qed.py image manipulation utility 2012-08-06 22:39:14 +02:00
README qemu-iotests: README: Fix spelling 2012-02-23 10:29:46 +01:00
socket_scm_helper.c qemu-iotests: add unix socket help program 2013-09-12 10:12:46 +02:00

README 

=== This is the QEMU I/O test suite ===

* Intro

This package contains a simple test suite for the I/O layer of qemu.
It does not require a guest, but only the qemu, qemu-img and qemu-io
binaries.  This does limit it to exercise the low-level I/O path only
but no actual block drivers like ide, scsi or virtio.

* Usage

Just run ./check to run all tests for the raw image format, or ./check
-qcow2 to test the qcow2 image format.  The output of ./check -h explains
additional options to test further image formats or I/O methods.

* Feedback and patches

Please send improvements to the test suite, general feedback or just
reports of failing tests cases to qemu-devel@savannah.nongnu.org.