linux-kernel - Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1)

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Message-ID: <20070802121018.GA11900@elte.hu>
Date:	Thu, 2 Aug 2007 14:10:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Kasper Sandberg <lkml@...anurb.dk>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ck@....kolivas.org
Subject: Re: SD still better than CFS for 3d   ?(was Re: 2.6.23-rc1)


* Kasper Sandberg <lkml@...anurb.dk> wrote:

> > ah, indeed, that makes quite a bit of sense. Almost all of the 
> > Reiser3 code runs under the BKL, and the only other major kernel 
> > infrastructure that has BKL dependencies is the TTY code. Kasper, as 
> > a debugging matter, could you try to move that spamassassin workload 
> > off into a non-Reiser3 filesystem and/or disable PREEMPT_BKL? If 
> > that makes a noticeable difference (for the better ;) then we can 
> > continue figuring out what's happening exactly.
> 
> the pricess is as this:
> mail client fetches mail
> mail client invokes spamasassin
>  if spam -> spam
>  else filtering
> if it matches certain filters, it gets put into my imap server, which is
> reiserfs.

do you have any filesystem that is not reiserfs? If yes, could you, as a 
test, check whether file activities on _that_ file system still cause 
these lags, or is the lag purely connected to the reiser3 filesystem?

	Ingo
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