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

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Date:	Tue, 17 Apr 2007 11:36:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Williams <pwil3058@...pond.net.au>
Cc:	Nick Piggin <npiggin@...e.de>,
	"Michael K. Edwards" <medwards.linux@...il.com>,
	William Lee Irwin III <wli@...omorphy.com>,
	Matt Mackall <mpm@...enic.com>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]


* Peter Williams <pwil3058@...pond.net.au> wrote:

> There's a lot of ugly code in the load balancer that is only there to 
> overcome the side effects of SMT and dual core.  A lot of it was put 
> there by Intel employees trying to make load balancing more friendly 
> to their systems.  What I'm suggesting is that an N CPUs per runqueue 
> is a better way of achieving that end.  I may (of course) be wrong but 
> I think that the idea deserves more consideration than you're willing 
> to give it.

i actually implemented that some time ago and i'm afraid it was ugly as 
hell and pretty fragile. Load-balancing gets simpler, but task picking 
gets alot uglier.

	Ingo
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