linux-kernel - Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Message-ID: <20070415193531.GD2986@holomorphy.com>
Date:	Sun, 15 Apr 2007 12:35:31 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Willy Tarreau <w@....eu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Slaby <jirislaby@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

On Sun, Apr 15, 2007 at 09:20:46PM +0200, Ingo Molnar wrote:
> so Linus was right: this was caused by scheduler starvation. I can see 
> one immediate problem already: the 'nice offset' is not divided by 
> nr_running as it should. The patch below should fix this but i have yet 
> to test it accurately, this change might as well render nice levels 
> unacceptably ineffective under high loads.

I've been suggesting testing CPU bandwidth allocation as influenced by
nice numbers for a while now for a reason.


-- wli
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