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SubjectRe: anticipatory scheduling questions
----- Original Message -----  
From: Andrew Morton <akpm@digeo.com>
Date: Sun, 2 Mar 2003 12:43:58 -0800
To: "Felipe Alfaro Solana" <felipe_alfaro@linuxmail.org>
Subject: Re: anticipatory scheduling questions

> "Felipe Alfaro Solana" <felipe_alfaro@linuxmail.org> wrote:
> > Both 2.5.63 and 2.5.63-mm1 exhibit this behavior, but
> > can't be reproduced with 2.4.20-2.54.
>
> By 2.54 I assume you mean 2.5.54?

No, I meant Red Hat's kernel 2.4.20-54. It's based on 2.4.21-pre4
with patches from Alan Cox, Arjan van den Ven and several
other people from RedHat.

> Your vmstat traces were showing tons of user time as well as system
> time. Please make sure that you have the latest version of procps,
> from http://surriel.com/procps/ or http://procps.sourceforge.net/

OK, I have downloaded procps 3.1.6 and have retested this on
both 2.4.20-2.54 (2.4), 2.5.63 (stock) and 2.5.63-mm1. I have attached
to this message "top -d1 -b" and "vmstat 1" command outputs,
compressed with bzip2 to shorten the message length. I hope they
will help in clarifying things a little. Both command were started up a
while before clicking "Reply" and a few seconds after the message
window opened up, just to let the system stabilize.

> Well certainly the IO stream _looks_ like it is stuck in IO-wait a lot.
>
> It is strange that this has been happening for a couple of months and seems
> to only affect Felipe Solana's copy of evolution. I still can't get my copy
> to spellcheck a thing. I need to wrestle with it a bit more.

A little bit more about my scenario: I'm running Red Hat Phoebe Beta 3
(what will in fact turn 8.1) with glibc-2.3.1, Evolution 1.2.2, XFree86 4.3.0
and KDE 3.1. I think Evolution has been compiled against glibc-2.3.1 and
so it will be using NPTL. As for XFree86 and KDE, I compiled them myself
and I'm sure they are using glibc-2.3.1 and NPTL.

Please, dont' hesitate in contacting me for further investigations.
Thanks!

Felipe Alfaro

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