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Re: XFS unlink still slow on 3.1.9 kernel ?

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: XFS unlink still slow on 3.1.9 kernel ?
From: Richard Ems <richard.ems@xxxxxxxxxxxxxxxxx>
Date: Mon, 13 Feb 2012 18:53:20 +0100
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20120213172937.GA25248@xxxxxxxxxxxxx>
References: <4F394116.8080200@xxxxxxxxxxxxxxxxx> <20120213170825.GA7197@xxxxxxxxxxxxx> <4F394442.9020307@xxxxxxxxxxxxxxxxx> <20120213171556.GA13449@xxxxxxxxxxxxx> <4F3947D6.5060402@xxxxxxxxxxxxxxxxx> <20120213172937.GA25248@xxxxxxxxxxxxx>
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On 02/13/2012 06:29 PM, Christoph Hellwig wrote:
> On Mon, Feb 13, 2012 at 06:26:46PM +0100, Richard Ems wrote:
>> YES. All files (and dirs) that I checked do show something as
>> 0: [0..7]: 18531216..18531223
>> So, what improvements can I expect from a kernel > 3.2 ?
>> Can I read somewhere about the changes/patches introduced?
> On some crazy workloads I've seen speedups up to a factor of 10.000 (5
> orders or magnitude).  You probably won't get that much of a speedup,
> but it will still be significant.
> The patch in mainline for this is:
> commit 859f57ca00805e6c482eef1a7ab073097d02c8ca
> Author: Christoph Hellwig <hch@xxxxxxxxxxxxx>
> Date:   Sat Aug 27 14:45:11 2011 +0000
>     xfs: avoid synchronous transactions when deleting attr blocks
>> Is there another way to mount/create/mkfs the XFS to improve the unlink
>> time for this case?
> Try increasing the inode size during filesystem creating using the
> "-i size=512" option or even "-i size=1024" if you still have
> out of line attributes.  The should give you even bigger speedups
> for this workload than the patch above.

Ok, Many thanks for this good info!

I will try to install a > 3.2 kernel and will create new XFS partitions
with "-i size=1024", since we use ACLs a lot for user access.
Is there a chance to change existing XFS partitions to "-i size=1024" ?
I already have 5 big partitions, all full of ACLs and not running
kernels > 3.2 !

Many thanks again,

Richard Ems       mail: Richard.Ems@xxxxxxxxxxxxxxxxx

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