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Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of rac
From: |
Max Reitz |
Subject: |
Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO |
Date: |
Wed, 6 Apr 2016 18:15:45 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 |
On 05.04.2016 11:21, Sascha Silbe wrote:
> On systems with fast IO, qemu-io may write more than 1 MiB before
> receiving the block-job-cancel command, causing the test case to fail.
>
> 141 is inherently racy, but we can at least reduce the likelihood of the
> job completing before the cancel command arrives by bumping the size of
> the data getting written; we'll try 32 MiB for a start.
Hm, interesting. I tried to prevent this by setting the block jobs'
speed to 1, which should make it stop after the block job has processed
the first block of data.
I won't oppose this patch, because if it fixes things for you, that's
good. But I don't think it should be necessary.
Max
>
> Once we actually move enough data around for the block job not to
> complete prematurely, the test will still fail because the offset value
> in the BLOCK_JOB_CANCELLED event will vary. Since this is more or less
> inherent to the nature of this event, we just replace it with a fixed
> value globally (in _filter_qmp), the same way we handle timestamps.
>
> Signed-off-by: Sascha Silbe <address@hidden>
> Reviewed-by: Bo Tu <address@hidden>
> ---
> tests/qemu-iotests/141 | 11 ++++++-----
> tests/qemu-iotests/141.out | 24 ++++++++++++------------
> tests/qemu-iotests/common.filter | 1 +
> 3 files changed, 19 insertions(+), 17 deletions(-)
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- Re: [Qemu-block] [PATCH 7/7] qemu-iotests: iotests.py: get rid of __all__, (continued)
- [Qemu-block] [PATCH 2/7] qemu-iotests: fix 051 on non-PC architectures, Sascha Silbe, 2016/04/05
- [Qemu-block] [PATCH 3/7] qemu-iotests: iotests.VM: remove qtest socket on error, Sascha Silbe, 2016/04/05
- [Qemu-block] [PATCH 1/7] qemu-iotests: check: don't place files with predictable names in /tmp, Sascha Silbe, 2016/04/05
- [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO, Sascha Silbe, 2016/04/05
- Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO,
Max Reitz <=
- Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO, Kevin Wolf, 2016/04/06
- Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO, Sascha Silbe, 2016/04/07
- Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO, Kevin Wolf, 2016/04/08
- Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO, Sascha Silbe, 2016/04/08
- Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO, Kevin Wolf, 2016/04/08
- Re: [Qemu-block] [PATCH 6/7] qemu-iotests: 141: reduce likelihood of race condition on systems with fast IO, Sascha Silbe, 2016/04/08
[Qemu-block] [PATCH 4/7] qemu-iotests: 148: properly skip test if quorum support is missing, Sascha Silbe, 2016/04/05
Re: [Qemu-block] [PATCH 0/7] next round of qemu-iotests fixes, Max Reitz, 2016/04/08