From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
To: alistair@devzero.co.uk, LKML <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.9: performance issues on Via Epia
Date: Tue, 19 Oct 2004 23:46:14 +0300
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On Tuesday 19 October 2004 18:04, Alistair John Strachan wrote:
> Hi,
> 
> I recently upgraded from 2.6.8.1 to 2.6.9 (the release, not -final) on my Via 
> Epia 5000 router. Now when I transfer files from the machine's HD vsftpd can 
> only achieve 3MB/s.

> I believe this is some performance problem specifically related to XFS, or 
> something specific to the local VM, because if I transfer from an NFS mounted 
> directory on the same machine, vsftpd easily achieves the 10MB/s I'm used to.

Sound like 'DMA off' problem.
 
> Top shows something typical to this during transfers from the machine's local 
> HD;
> 
> Cpu(s):  0.7% us,  9.2% sy,  0.0% ni,  0.3% id, 84.5% wa,  5.3% hi,  0.0% si
> 
> Which seems like an awful lot of wait time. Anybody got any suggestions of 
> where to start reverting patches? The amount of difference between 2.6.8.1 
> and 2.6.9 is quite daunting.

Binary search is converging quickly.
 
> By the way, copying a file locally on the system from the same partition to 
> another directory is far more efficient.
> 
> [root] 16:02 [~] time cp /var/cache/swapfile here
> `/var/cache/swapfile' -> `here'
> 
> real    0m37.904s
> user    0m0.115s
> sys     0m13.033s

size of this file?

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