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Re: [Fwd: XFS lstat() _very_ slow on SMP]

To: Steve Lord <lord@xxxxxxx>
Subject: Re: [Fwd: XFS lstat() _very_ slow on SMP]
From: Dave Chinner <dgc@xxxxxxx>
Date: Thu, 19 May 2005 11:06:02 +1000
Cc: XFS Linux <linux-xfs@xxxxxxxxxxx>, kas@xxxxxxxxxx
In-reply-to: <4288D8B8.4070302@xxxxxxx>; from lord@xxxxxxx on Mon, May 16, 2005 at 12:30:32PM -0500
References: <4288D8B8.4070302@xxxxxxx>
Sender: linux-xfs-bounce@xxxxxxxxxxx
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On Mon, May 16, 2005 at 12:30:32PM -0500, Steve Lord wrote:
> Forwarding from lkml to somewhere where it might be seen.
> 
> Steve
> 
> -------- Original Message --------
> Subject: XFS lstat() _very_ slow on SMP
> Date: Mon, 16 May 2005 18:25:06 +0200
> From: Jan Kasprzak <kas@xxxxxxxxxx>
> To: linux-kernel@xxxxxxxxxxxxxxx
> 
>       Hi all,
> 
>       I have a big XFS volume on my fileserver, and I have noticed that
> making an incremental backup of this volume is _very_ slow. The incremental
> backup essentially checks mtime of all files on this volume, and it
> takes ~4ms of _system_ time (i.e. no iowait or what) to do a lstat().
> 
>       The server is quad opteron with 26GB of RAM, 2.6.11.x kernel.
> The volume in question is this big:
> 
> $ df -i /export/home
> Filesystem            Inodes   IUsed   IFree IUse% Mounted on
> /dev/array-vg/home   2147502080 7917653 2139584427    1% /export/home
> $ df -k /export/home
> Filesystem           1K-blocks      Used Available Use% Mounted on
> /dev/array-vg/home   2147371008 558965100 1588405908  27% /export/home

Have you tried setting the ihashsize mount option?

Cheers,

Dave.
-- 
Dave Chinner
R&D Software Engineer
SGI Australian Software Group


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