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Date: Mon, 24 May 2010 16:44:35 -0400 From: Rik van Riel <riel@...hat.com> To: Ingo Molnar <mingo@...e.hu> CC: Arjan van de Ven <arjan@...radead.org>, linux-kernel@...r.kernel.org, davej@...hat.com, Andrew Morton <akpm@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [PATCH v2 0/8] Fix performance issue with ondemand governor On 05/09/2010 01:49 PM, Ingo Molnar wrote: > * Arjan van de Ven<arjan@...radead.org> wrote: > >> [Version 2 includes the acks/etc. Andrew: no changes from the patches that >> are in -mm] >> >> There have been various reports of the ondemand governor causing some >> serious performance issues, one of the latest ones from Andrew. There are >> several fundamental issues with ondemand (being worked on), but the report >> from Andrew can be fixed relatively easily. >> >> The fundamental issue is that ondemand will go to a (too) low CPU frequency >> for workloads that alternatingly disk and CPU bound... > > I've applied your series to sched/core and started testing it, thanks Arjan! This code seems to help significantly with some workloads, allowing more systems to use the ondemand governor (and having fewer systems waste power by using the performance governor all the time). It would be nice to see it in 2.6.35 -- All rights reversed -- 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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