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Date: Wed, 18 Apr 2007 22:14:32 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Nick Piggin <npiggin@...e.de> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Matt Mackall <mpm@...enic.com>, William Lee Irwin III <wli@...omorphy.com>, Peter Williams <pwil3058@...pond.net.au>, Mike Galbraith <efault@....de>, Con Kolivas <kernel@...ivas.org>, Ingo Molnar <mingo@...e.hu>, ck list <ck@....kolivas.org>, Bill Huey <billh@...ppy.monkey.org>, linux-kernel@...r.kernel.org, Arjan van de Ven <arjan@...radead.org>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS] On Thu, 19 Apr 2007 05:18:07 +0200 Nick Piggin <npiggin@...e.de> wrote: > And yes, by fairly, I mean fairly among all threads as a base resource > class, because that's what Linux has always done Yes, there are potential compatibility problems. Example: a machine with 100 busy httpd processes and suddenly a big gzip starts up from console or cron. Under current kernels, that gzip will take ages and the httpds will take a 1% slowdown, which may well be exactly the behaviour which is desired. If we were to schedule by UID then the gzip suddenly gets 50% of the CPU and those httpd's all take a 50% hit, which could be quite serious. That's simple to fix via nicing, but people have to know to do that, and there will be a transition period where some disruption is possible. - 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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