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Date: Sun, 15 Apr 2007 12:35:31 -0700
From: William Lee Irwin III <wli@holomorphy.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Willy Tarreau <w@1wt.eu>, "Eric W. Biederman" <ebiederm@xmission.com>,
       Nick Piggin <npiggin@suse.de>, linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Con Kolivas <kernel@kolivas.org>, Mike Galbraith <efault@gmx.de>,
       Arjan van de Ven <arjan@infradead.org>,
       Thomas Gleixner <tglx@linutronix.de>, Jiri Slaby <jirislaby@gmail.com>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
Message-ID: <20070415193531.GD2986@holomorphy.com>
References: <20070414132732.GA22103@1wt.eu> <20070414161927.GD3099@elte.hu> <m1abxanahn.fsf@ebiederm.dsl.xmission.com> <20070414172920.GA2433@1wt.eu> <m1647yn956.fsf@ebiederm.dsl.xmission.com> <20070414175433.GA17527@elte.hu> <20070414181854.GA5826@1wt.eu> <20070415175555.GA28524@elte.hu> <20070415180604.GA550@1wt.eu> <20070415192046.GA7504@elte.hu>
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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