Message-ID: <41A2F3C0.90400@mrv.com>
Date: Tue, 23 Nov 2004 10:24:32 +0200
From: emann@mrv.com (Eran Mann)
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To: Ingo Molnar <mingo@elte.hu>
CC: linux-kernel@vger.kernel.org
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-2
References: <20041116125402.GA9258@elte.hu> <20041116130946.GA11053@elte.hu> <20041116134027.GA13360@elte.hu> <20041117124234.GA25956@elte.hu> <20041118123521.GA29091@elte.hu> <20041118164612.GA17040@elte.hu> <20041122005411.GA19363@elte.hu> <41A1A6E6.5090807@mrv.com> <20041122100140.GD6817@elte.hu> <41A1EAE0.9080504@mrv.com> <20041122144248.GB28211@elte.hu>
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Ingo Molnar wrote:
> * Eran Mann <emann@mrv.com> wrote:
> 
>>Right on.
>>After hdparm -d0 I see maximum latency of 35 us after a full kernel 
>>build with a few GUI apps in the background. I?ll try to find a 
>>reasonable compromise.
> 
> it might make sense to report this to the hw vendor as well, as these
> latencies dont occur at _every_ IDE DMA, it might be some sort of
> chipset (or BIOS) bug they might want to see resolved as well (if this
> isnt a ship-and-forget vendor). 2 msec stalls are not nice to a fair
> number of applications.
> 
> 	Ingo

It?s a rather old white-box machine with a noname VIA-based motherboard, 
So I don?t really have whom to report the problem to. On the other hand 
with udma2 I see latencies < 170 us which seems reasonable.
Thanks for the advice.
   Eran.
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