From: Peter Chubb <peter@chubb.wattle.id.au>
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Message-ID: <16376.31727.114173.311369@wombat.chubb.wattle.id.au>
Date: Mon, 5 Jan 2004 07:47:43 +1100
To: Willy Tarreau <willy@w.ods.org>
Cc: Soeren Sonnenburg <kernel@nn7.de>,
       Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: xterm scrolling speed - scheduling weirdness in 2.6 ?!
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	<20040103191901.GC3728@alpha.home.local>
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>>>>> "Willy" == Willy Tarreau <willy@w.ods.org> writes:

Willy> Hi !  On Sat, Jan 03, 2004 at 07:52:36PM +0100, Soeren
Willy> Sonnenburg wrote:
 
>> So it is like 30 times slower on 2.6. when running for the first
>> time...  this also happens if I do e.g. find ./ and watch the
>> output pass by...
>> 
>> This is without preemption on powerpc...
>> 
>> Anyone else with that problem - ideas of the cause ?

I see a very similar problem ... seems like a process doing disc I.O
isn't being woken up fast enough after the I/O completes.

For some processes, allowing interrupts back on (hdparm -u1) helps;
for others, switching to the deadline elevator helps; neither are
complete solutions.

PeterC
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