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Date: Tue, 12 Nov 2002 15:23:54 +0100
From: Jens Axboe <axboe@suse.de>
To: Aaron Lehmann <aaronl@vitelus.com>
Cc: Andrew Morton <akpm@digeo.com>, Con Kolivas <conman@kolivas.net>,
       linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: [BENCHMARK] 2.5.47{-mm1} with contest
Message-ID: <20021112142354.GC832@suse.de>
References: <1037057498.3dd03dda5a8b9@kolivas.net> <20021112030453.GB15812@vitelus.com> <3DD0E037.1FC50147@digeo.com> <20021112142014.GC15812@vitelus.com>
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On Tue, Nov 12 2002, Aaron Lehmann wrote:
> On Tue, Nov 12, 2002 at 03:04:23AM -0800, Andrew Morton wrote:
> > It will never be stunningly better than 2.4 for normal workloads on
> > normal machines, because 2.4 just ain't that bad.
> 
> Actually, I am having serious problems with 2.4 (.20-pre5). Copying a
> file from hda to hdc without really doing anything else goes very
> slowly and lags the whole system ruthlessly. The load average rises to
> about three. Any app which tries to touch the disk will hang for
> several seconds. Yes, DMA is on on both drives (udma5), as well as
> 32-bit I/O and unmaskirq. Bad IDE controller or driver? I don't know.
> It's a ServerWorks CSB5. I've been meaning to try 2.5-mm to see if it
> improves this.

Testing 2.5 for this would be interesting too indeed, but you should
also try 2.4.20-rc1. Between -pre3 and -pre8 (iirc) you could have
awfully slow io. And you should probably do

# elvtune -r512 /dev/hd{a,c}

too, in 2.4.20-rc1

-- 
Jens Axboe

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