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

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Message-ID: <20070724210607.GB32582@gnuppy.monkey.org>
Date:	Tue, 24 Jul 2007 14:06:07 -0700
From:	Bill Huey (hui) <billh@...ppy.monkey.org>
To:	Chris Snook <csnook@...hat.com>
Cc:	Chris Friesen <cfriesen@...tel.com>, Tong Li <tong.n.li@...el.com>,
	mingo@...e.hu, linux-kernel@...r.kernel.org,
	"Bill Huey (hui)" <billh@...ppy.monkey.org>,
	Con Kolivas <kernel@...ivas.org>
Subject: Re: [RFC] scheduler: improve SMP fairness in CFS

On Tue, Jul 24, 2007 at 04:39:47PM -0400, Chris Snook wrote:
> Chris Friesen wrote:
>> We currently use CKRM on an SMP machine, but the only way we can get away 
>> with it is because our main app is affined to one cpu and just about 
>> everything else is affined to the other.
>
> If you're not explicitly allocating resources, you're just low-latency, not 
> truly realtime.  Realtime requires guaranteed resources, so messing with 
> affinities is a necessary evil.

You've mentioned this twice in this thread. If you're going to talk about this
you should characterize this more specifically because resource allocation is
a rather incomplete area in the Linux. Rebalancing is still an open research
problem the last time I looked.

Tong's previous trio patch is an attempt at resolving this using a generic
grouping mechanism and some constructive discussion should come of it.

bill

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