Re: [linux-audio-dev] latency performance of 2.4 and 2.5...

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Subject: Re: [linux-audio-dev] latency performance of 2.4 and 2.5...
From: Joern Nettingsmeier (nettings_AT_folkwang-hochschule.de)
Date: Mon Oct 14 2002 - 11:52:40 EEST

Andrew Morton wrote:
>
> Joern Nettingsmeier wrote:
> >
> > some new interesting results with 2.5.42:
> >
> > http://spunk.dnsalias.org/latencytest/2.5.42/2x256.html
> >
> > overall much worse, *but* greatly reduced latency peaks (max. 6 ms) as
> > compared to 2.5.41:
> >
> > http://spunk.dnsalias.org/latencytest/2.5.41/2x256.html
> >
> > here the peaks easily reach 13 ms.
>
> Rather depends on the filesystem. ext3 does its own write scheduling,
> and does stuff inside lock_kernel(). It needs a couple of scheduling
> points I guess.
>
> I'd expect ext2 to work OK with preemption, but nobody has really
> looked yet. Unless you're using ftruncate() (grr.)

oh, i should have stated i'm using reiserfs on /, /usr and /var (var
being a softraid-0). 

-- 
Jörn Nettingsmeier     
Kurfürstenstr 49, 45138 Essen, Germany      
http://spunk.dnsalias.org (my server)
http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)

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