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

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Message-ID: <20070724094313.GB26724@one.firstfloor.org>
Date:	Tue, 24 Jul 2007 11:43:14 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	"Li, Tong N" <tong.n.li@...el.com>,
	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] scheduler: improve SMP fairness in CFS

On Mon, Jul 23, 2007 at 03:25:12PM -0600, Chris Friesen wrote:
> Li, Tong N wrote:
> >On the other hand, if locking does
> >become a problem for certain systems/workloads, increasing
> >sysctl_base_round_slice can reduce the locking frequency and alleviate
> >the problem, at the cost of being relatively less fair across the CPUs. 
> 
> If locking does become a problem, it may make sense to switch instead to 
> a lockless algorithm of some sort...

That usually has the same issue with cache lines. It would be better
to analyze first if such global synchronization is really needed.
I hope not.

-Andi
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