Re: [PATCH] xfstests 235: do smaller test IO

[Eric Sandeen <sandeen@xxxxxxxxxx>]

On 3/26/12 5:09 PM, Dave Chinner wrote:
> On Mon, Mar 26, 2012 at 02:30:33PM -0500, Eric Sandeen wrote:
>> Test 235 fails on ext2/ext3 with 1024 fs block size because a
>> 16k write uses an extra metadata block.  If we do a smaller write
>> this won't happen.
> .....
>>  
>> -$XFS_IO_PROG -F -c 'pwrite 0 16k' -c 'fsync' \
>> +$XFS_IO_PROG -F -c 'pwrite 0 8k' -c 'fsync' \
> 
> So now it fails only on 512 byte block size filesystems?

ext[23] don't do 512 byte block filesystems, so no.  ;)

> Perhaps rather than an exact match, a "within_tolerance" match could
> be done on the relevant fields?
> 
> i.e something like:
> 
> blksused=`{requota cmd} | awk '/fsgqa/ { print $3 }'`
> _within_tolerance "blocks used" $blksused 16 1
> 
> If you wanted to get really fancy, the tolerance could be set
> depending on filesystem type and block size, but I don't think that
> is really necessary....

But I don't want to get really fancy, I spend enough time in xfstests
already.  ;)


TBH even the _within_tolerance will take more munging around to get right,
it doesn't seem worth it, but if it's required for a review, ok...

-Eric

> Cheers,
> 
> Dave.

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