linux-kernel - Re: [PATCH 3/3] Subject: SCHED - Use a 2-d bitmap for searching lowest-pri CPU

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Message-ID: <20071205093412.GA17911@elte.hu>
Date:	Wed, 5 Dec 2007 10:34:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	rostedt@...dmis.org, linux-rt-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Subject: SCHED - Use a 2-d bitmap for searching
	lowest-pri CPU


* Gregory Haskins <ghaskins@...ell.com> wrote:

> The current code use a linear algorithm which causes scaling issues on 
> larger SMP machines.  This patch replaces that algorithm with a 
> 2-dimensional bitmap to reduce latencies in the wake-up path.

hm, what kind of scaling issues - do you have any numbers? What workload 
did you measure and on what hardware?

	Ingo
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