Re: Fw: 2.6.11-rc5-mm1: reiser4 eating cpu time

From: Denis Vlasenko
Date: Tue Mar 15 2005 - 01:59:30 EST

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.

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