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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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