linux-kernel - Re: [RFC] scheduler: improve SMP fairness in CFS

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Message-ID: <p73ir8aubzx.fsf@bingen.suse.de>
Date:	23 Jul 2007 22:00:02 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Tong Li <tong.n.li@...el.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [RFC] scheduler: improve SMP fairness in CFS

Tong Li <tong.n.li@...el.com> writes:
> +
> +        read_lock_irqsave(&dwrr_highest_lock, flags);

That lock looks like it would bounce between CPUs like crazy.
Did you try any benchmarks on a larger system? 

-Andi
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