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Date: Fri, 11 Sep 2009 18:37:34 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Arjan van de Ven <arjan@...radead.org> Cc: linux-kernel@...r.kernel.org, lenb@...nel.org, mingo@...e.hu, akpm@...ux-foundation.org, peterz@...radead.org, yanmin_zhang@...ux.intel.com, torvalds@...ux-foundation.org Subject: Re: PATCH] cpuidle: A new variant of the menu governor to boost IO performance On Fri, Sep 11 2009, Arjan van de Ven wrote: > From: Arjan van de Ven <arjan@...ux.intel.com> > Subject: [PATCH] cpuidle: A new variant of the menu governor > > This patch adds a new idle governor which balances power savings, > energy efficiency and performance impact. > > The reason for a reworked governor is that there have been > serious performance issues reported with the existing code > on Nehalem server systems. > > To show this I'm sure Andrew wants to see benchmark results: > (benchmark is "fio", "no cstates" is using "idle=poll") > > no cstates current linux new algorithm > 1 disk 107 Mb/s 85 Mb/s 105 Mb/s > 2 disks 215 Mb/s 123 Mb/s 209 Mb/s > 12 disks 590 Mb/s 320 Mb/s 585 Mb/s Heh that's interesting, I have noticed some oddities that I haven't pursued further yet. But it was definitely power state related, so I'll give your patch spin. -- Jens Axboe -- 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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