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From: Marc-Christian Petersen <m.c.p@wolk-project.de>
Organization: WOLK - Working Overloaded Linux Kernel
To: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] 2.4.20-rmap15a
Date: Sun, 1 Dec 2002 22:41:04 +0100
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Cc: Rik van Riel <riel@conectiva.com.br>, Con Kolivas <conman@kolivas.net>
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On Sunday 01 December 2002 22:25, you wrote:

Hi Rik,

> That was my gut feeling as well, but I guess it's a good thing
> to quantify how much of a difference it makes.  I wonder if we
> could convince Con to test a kernel both with and without this
> patch and look at the difference.
yep, would be a good idea. Con: *wake up ;)*

> > So, here my patch proposal. Ontop of 2.4.20-rmap15a.
> Looks good, now lets test it.  If the patch is as needed as you
> say we should push it to marcelo ;)
yep, Andrew should do it. Anyway, all those patches do _not_ get rid of those 
I/O pauses/stops since 2.4.19-pre6. Andrea did a good approach with his 
lowlatency elevator, even if it drops throughput (needs more testing to 
become equivalent to throughput w/o it) and also Con and me did a Mini 
Lowlatency Elevator + Config option, so you can decide weather you are 
building for serverusage where interactive "desktop performance" is not 
needed ;) or not.

I wish I'll have the time to eleminate the broken code which went into 2.4.19 
that causes those I/O stops.

*Repetition: those stopps do not occur with 2.4.18* ;)

ciao, Marc


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