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

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Message-Id: <1185863461.3092.4.camel@twins>
Date:	Tue, 31 Jul 2007 08:31:01 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kasper Sandberg <lkml@...anurb.dk>
Cc:	Ingo Molnar <mingo@...e.hu>,
	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)

On Tue, 2007-07-31 at 01:46 +0200, Kasper Sandberg wrote:

> could perhaps be filesystem related, i have my maildir(extremely large)
> on reiserfs, and /home on xfs. what my mail client will do is download
> mail, spamasassin it(loading database from home), then it will put to
> imap server placing it on reiserfs, and then a "local" copy in my home.

Ooh, do you perchance have PREEMPT_BKL=y? 

If so, try on another filesystem than reiserfs (or disable PREEMPT_BKL,
but that is obviously the lesser of the two choices).

Ingo traced a 1+ second latency at my end to BKL priority inversion
between tty and reiserfs.

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