| Message ID | 20200601181118.579-14-vsementsov@virtuozzo.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | backup performance: block_status + async | expand |
23.07.2020 11:03, Max Reitz wrote: > On 01.06.20 20:11, Vladimir Sementsov-Ogievskiy wrote: >> After introducing parallel async copy requests instead of plain >> cluster-by-cluster copying loop, backup job may finish earlier than >> final assertion in do_test_stop. Let's require slow backup explicitly >> by specifying speed parameter. > > Isn’t the problem really that block_set_io_throttle does absolutely > nothing? (Which is a long-standing problem with 129. I personally just > never run it, honestly.) Hmm.. is it better to drop test_drive_backup() from here ? > >> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> >> --- >> tests/qemu-iotests/129 | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/tests/qemu-iotests/129 b/tests/qemu-iotests/129 >> index 4db5eca441..bca56b589d 100755 >> --- a/tests/qemu-iotests/129 >> +++ b/tests/qemu-iotests/129 >> @@ -76,7 +76,7 @@ class TestStopWithBlockJob(iotests.QMPTestCase): >> def test_drive_backup(self): >> self.do_test_stop("drive-backup", device="drive0", >> target=self.target_img, >> - sync="full") >> + sync="full", speed=1024) >> >> def test_block_commit(self): >> self.do_test_stop("block-commit", device="drive0") >> > > -- Best regards, Vladimir
On 22.10.20 23:10, Vladimir Sementsov-Ogievskiy wrote: > 23.07.2020 11:03, Max Reitz wrote: >> On 01.06.20 20:11, Vladimir Sementsov-Ogievskiy wrote: >>> After introducing parallel async copy requests instead of plain >>> cluster-by-cluster copying loop, backup job may finish earlier than >>> final assertion in do_test_stop. Let's require slow backup explicitly >>> by specifying speed parameter. >> >> Isn’t the problem really that block_set_io_throttle does absolutely >> nothing? (Which is a long-standing problem with 129. I personally just >> never run it, honestly.) > > Hmm.. is it better to drop test_drive_backup() from here ? I think the best would be to revisit this: https://lists.nongnu.org/archive/html/qemu-block/2019-06/msg00499.html Max
04.11.2020 20:30, Max Reitz wrote: > On 22.10.20 23:10, Vladimir Sementsov-Ogievskiy wrote: >> 23.07.2020 11:03, Max Reitz wrote: >>> On 01.06.20 20:11, Vladimir Sementsov-Ogievskiy wrote: >>>> After introducing parallel async copy requests instead of plain >>>> cluster-by-cluster copying loop, backup job may finish earlier than >>>> final assertion in do_test_stop. Let's require slow backup explicitly >>>> by specifying speed parameter. >>> >>> Isn’t the problem really that block_set_io_throttle does absolutely >>> nothing? (Which is a long-standing problem with 129. I personally just >>> never run it, honestly.) >> >> Hmm.. is it better to drop test_drive_backup() from here ? > > I think the best would be to revisit this: > > https://lists.nongnu.org/archive/html/qemu-block/2019-06/msg00499.html > > Max > I've checked, no, that doesn't help. I suppose that throttling has same defect as original block-job speed: it calculates throttling after request, and if we issue simultaneously many requests they all will be handled (and after it we'll have long throttling pause). New solution for backup in these series works better with parallel requests (see patch [PATCH v2 07/20] block/block-copy: add ratelimit to block-copy). So, I'd keep this patch for now. -- Best regards, Vladimir
diff --git a/tests/qemu-iotests/129 b/tests/qemu-iotests/129 index 4db5eca441..bca56b589d 100755 --- a/tests/qemu-iotests/129 +++ b/tests/qemu-iotests/129 @@ -76,7 +76,7 @@ class TestStopWithBlockJob(iotests.QMPTestCase): def test_drive_backup(self): self.do_test_stop("drive-backup", device="drive0", target=self.target_img, - sync="full") + sync="full", speed=1024) def test_block_commit(self): self.do_test_stop("block-commit", device="drive0")
After introducing parallel async copy requests instead of plain cluster-by-cluster copying loop, backup job may finish earlier than final assertion in do_test_stop. Let's require slow backup explicitly by specifying speed parameter. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> --- tests/qemu-iotests/129 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)