From: Denis Vlasenko <vda@ilport.com.ua>
To: Alexander Gran <alex@zodiac.dnsalias.org>,
       "E.Gryaznova" <grev@namesys.com>
Subject: Re: Fw: 2.6.11-rc5-mm1: reiser4 eating cpu time
Date: Tue, 15 Mar 2005 08:57:36 +0200
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On Sunday 13 March 2005 15:24, Alexander Gran wrote:
> Hi, 
> 
> Well, of course it cannot handle that large files (I wouldn't expect that, 
> either). My Problem is that when I open the file, it's not just kwrite but 
> other processes that need so much cpu time. That kwrite is eating cpu is ok. 
> I cannot reproduce the behaviour for some reason however. 
> So for short what's now (2.6.11-mm3) hapening:
> I open a file of 150MB with kwrite. Kwrite start using all cpu it can get
> After some seconds pdflush kicks in. Kwrite seems to wait, and pdflush is 
> eating cpu cyles. These 2 alternate for some time, until file is loaded. 

I bet kwrite does something silly.

Use strace -tt to find out whether kwrite spends that much CPU
by doing zillions of syscalls or not. 
--
vda

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