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Re: LWN.net article: creating 1 billion files -> XFS looses

To: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Subject: Re: LWN.net article: creating 1 billion files -> XFS looses
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 19 Aug 2010 08:05:12 -0400
Cc: xfs@xxxxxxxxxxx
In-reply-to: <201008191312.49346@xxxxxx>
References: <201008191312.49346@xxxxxx>
User-agent: Mutt/1.5.20 (2009-08-17)
On Thu, Aug 19, 2010 at 01:12:45PM +0200, Michael Monnerie wrote:
> The subject is a bit harsh, but overall the article says:
> XFS is slowest on creating and deleting a billion files
> XFS fsck needs 30GB RAM to fsck that 100TB filesystem.
> 
> http://lwn.net/SubscriberLink/400629/3fb4bc34d6223b32/

The creation and deletion performance is a known issue, and too a large
extent fixes by the new delaylog code.  We're not quite as fast as ext4
yet, but it's getting close.

The repair result looks a lot like the pre-3.1.0 xfsprogs repair.

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