[Question]: xfstests test generic/233 failure

[Question]: xfstests test generic/233 failure

[Zeng Linggang]

Hello,

When I take XFS filesystem as test target, the case generic/233 often
fails in my test machines (RHEL7.0GA: 3.10.0-123) with output like this:
generic/233  [failed, exit status 1] - output mismatch (see
/var/lib/xfstests/results//generic/233.out.bad)
--- tests/generic/233.out       2014-10-22 14:17:06.239461640 +0800
+++ results/generic/233.out.bad 2014-10-23 14:39:48.210480319 +0800
@@ -4,4 +4,7 @@
seed = S
Comparing user usage
-Comparing group usage
+4c4
+< #1001     --   31348   32000   32000            772  1000  1000
+---
+> #1001     --   31144   32000   32000            772  1000  1000
...
generic/231 and generic/270 also have the similar quota accounting mismatch.

Could anyone give me some hints about it?

Thanks,
Zeng

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Re: [Question]: xfstests test generic/233 failure

[Dave Chinner]

On Wed, Oct 29, 2014 at 05:46:17PM +0800, Zeng Linggang wrote:
> Hello,
> 
> When I take XFS filesystem as test target, the case generic/233 often
> fails in my test machines (RHEL7.0GA: 3.10.0-123) with output like this:
> generic/233  [failed, exit status 1] - output mismatch (see
> /var/lib/xfstests/results//generic/233.out.bad)
> --- tests/generic/233.out       2014-10-22 14:17:06.239461640 +0800
> +++ results/generic/233.out.bad 2014-10-23 14:39:48.210480319 +0800
> @@ -4,4 +4,7 @@
> seed = S
> Comparing user usage
> -Comparing group usage
> +4c4
> +< #1001     --   31348   32000   32000            772  1000  1000
> +---
> +> #1001     --   31144   32000   32000            772  1000  1000
> ...
> generic/231 and generic/270 also have the similar quota accounting mismatch.

fsstress can result in different file and directory layouts, hence
result in different amounts of metadata in the filesystem. Metadata
is also accounted to quotas (e.g. to the user who owns the
directory) and so even if data usage is identical the metadata can
still vary.

I see these test give small variations quite frequently, but they
are are usually only quite small (a handful of blocks) so I've never
really worried about it too much.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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Re: [Question]: xfstests test generic/233 failure

[Zeng Linggang]

On Wed, 2014-10-29 at 21:36 +1100, Dave Chinner wrote:
> On Wed, Oct 29, 2014 at 05:46:17PM +0800, Zeng Linggang wrote:
> > Hello,
> > 
> > Comparing user usage
> > -Comparing group usage
> > +4c4
> > +< #1001     --   31348   32000   32000            772  1000  1000
> > +---
> > +> #1001     --   31144   32000   32000            772  1000  1000
> > ...
> > generic/231 and generic/270 also have the similar quota accounting mismatch.
> 
> fsstress can result in different file and directory layouts, hence
> result in different amounts of metadata in the filesystem. Metadata
> is also accounted to quotas (e.g. to the user who owns the
> directory) and so even if data usage is identical the metadata can
> still vary.
> 
> I see these test give small variations quite frequently, but they
> are are usually only quite small (a handful of blocks) so I've never
> really worried about it too much.
> 

Yep, it make me more clearer.
And thank you very much.

Best regards,
Zeng

> Cheers,
> 
> Dave.


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