linux-kernel - Re: Linus 2.6.23-rc1

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Message-ID: <alpine.LFD.0.999.0707281518490.3442@woody.linux-foundation.org>
Date:	Sat, 28 Jul 2007 15:22:31 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
cc:	Kasper Sandberg <lkml@...anurb.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	CK Mailinglist <ck@....kolivas.org>
Subject: Re: Linus 2.6.23-rc1

On Sat, 28 Jul 2007, Jan Engelhardt wrote:
> 
> I generally run with CONFIG_HZ=100, CONFIG_NO_HZ=n, CONFIG_PREEMPT_NONE.

Ok, that's HZ=100 is likely the worst case, as it effectively multiples 
all the scheduler latencies by 10 (rather than by 4, which is what the 
default 250Hz does).

That said, I think most testing showed that the CFS scheduler tunables 
didn't have a huge amount of impact on how things felt, so that 
factor-of-ten might not even matter that much. The 3D game issues may well 
be totally elsewhere.

But it's certainly worth looking at.

		Linus
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