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

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Message-ID: <20070802114557.GC4067@elte.hu>
Date:	Thu, 2 Aug 2007 13:45:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Kasper Sandberg <lkml@...anurb.dk>,
	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)


* Lee Revell <rlrevell@...-job.com> wrote:

> On 7/31/07, Ingo Molnar <mingo@...e.hu> wrote:
> > 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.
> 
> Also NFS:
> 
> $ grep -rIi lock_kernel kernel-source/linux-2.6.17/fs/nfs/ | wc -l
> 94

yeah - but i never saw NFS cause really big BKL latencies. IIRC it uses 
the BKL mostly for archaic reasons, most of the NFS code is SMP-safe. 
Almost all of the reiser3 code runs under the BKL on the other hand.

	Ingo
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