From: Jens Axboe <jens.axboe@oracle.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: linux-kernel@vger.kernel.org, lenb@kernel.org, mingo@elte.hu,
akpm@linux-foundation.org, peterz@infradead.org,
yanmin_zhang@linux.intel.com, torvalds@linux-foundation.org
Subject: Re: PATCH] cpuidle: A new variant of the menu governor to boost IO performance
Date: Fri, 11 Sep 2009 18:37:34 +0200 [thread overview]
Message-ID: <20090911163733.GL14984@kernel.dk> (raw)
In-Reply-To: <20090911174019.1ed02737@infradead.org>
On Fri, Sep 11 2009, Arjan van de Ven wrote:
> From: Arjan van de Ven <arjan@linux.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
next prev parent reply other threads:[~2009-09-11 16:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-11 15:40 PATCH] cpuidle: A new variant of the menu governor to boost IO performance Arjan van de Ven
2009-09-11 16:37 ` Jens Axboe [this message]
2009-09-11 19:16 ` John Stoffel
2009-09-11 19:51 ` Arjan van de Ven
2009-09-14 3:30 ` Zhang, Yanmin
2009-09-11 22:03 ` Matthew Garrett
2009-09-12 3:26 ` Arjan van de Ven
2009-09-12 11:39 ` Matthew Garrett
2009-09-12 14:04 ` Arjan van de Ven
2009-09-13 23:30 ` Andrew Morton
2009-09-14 2:45 ` Arjan van de Ven
2009-09-14 7:43 ` Andrew Morton
2009-09-14 8:04 ` Tejun Heo
2009-09-14 8:15 ` Peter Zijlstra
2009-09-14 9:09 ` Tejun Heo
2009-09-14 20:31 ` Arjan van de Ven
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