From: Peter Zijlstra <peterz@infradead.org>
To: Norbert Preining <preining@logic.at>
Cc: Arjan van de Ven <arjan@infradead.org>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
akpm <akpm@linux-foundation.org>, Mike Galbraith <efault@gmx.de>,
tglx <tglx@linutronix.de>
Subject: Re: high power consumption in recent kernels
Date: Thu, 08 Jul 2010 21:06:31 +0200 [thread overview]
Message-ID: <1278615991.1900.187.camel@laptop> (raw)
In-Reply-To: <1278604779.1900.157.camel@laptop>
On Thu, 2010-07-08 at 17:59 +0200, Peter Zijlstra wrote:
> OK, so Arjan said the gain could come from tricking the idle governor
> into not using deeper C states. He also said he significantly cured said
> governor in .35.
>
> Mike could you re-run your netperf tests that showed the 10% throughput
> gain? Hopefully the fixed governor will yield the same result and we can
> kill off this ratelimit thing.
FWIW, on my test-box, 35-rc4-tip, using ondemand:
with nohz_ratelimit() : ~2119.54 MB/s
without nohz_ratelimit() : ~2353.03 MB/s
Seems to suggest we should simply kill the thing..
next prev parent reply other threads:[~2010-07-08 19:06 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-06 16:45 high power consumption in recent kernels Norbert Preining
2010-07-08 9:06 ` Peter Zijlstra
2010-07-08 11:57 ` Arjan van de Ven
2010-07-08 11:58 ` Peter Zijlstra
2010-07-08 12:04 ` Norbert Preining
2010-07-08 12:22 ` Peter Zijlstra
2010-07-08 12:46 ` Norbert Preining
2010-07-08 13:23 ` Peter Zijlstra
2010-07-08 15:59 ` Peter Zijlstra
2010-07-08 19:06 ` Peter Zijlstra [this message]
2010-07-08 19:40 ` Mike Galbraith
2010-07-08 20:44 ` Peter Zijlstra
2010-07-09 3:08 ` Arjan van de Ven
2010-07-09 5:55 ` Mike Galbraith
2010-07-08 19:37 ` Mike Galbraith
2010-07-08 15:11 ` Arjan van de Ven
2010-07-09 19:09 ` Pavel Machek
[not found] <1283840425.26157.6486.camel@debian>
[not found] ` <20100909093140.GC29648@gamma.logic.tuwien.ac.at>
[not found] ` <EA929A9653AAE14F841771FB1DE5A1366008738EC2@rrsmsx501.amr.corp.intel.com>
[not found] ` <20100909205115.GD11053@gamma.logic.tuwien.ac.at>
[not found] ` <1284107099.402.30.camel@laptop>
2010-09-10 14:48 ` Shi, Alex
2010-09-10 14:54 ` Norbert Preining
2010-09-13 5:21 ` Alex,Shi
2010-09-17 2:09 ` Alex,Shi
2010-09-22 15:44 ` Norbert Preining
2010-09-28 10:40 ` Alex,Shi
2010-09-29 14:39 ` Norbert Preining
2010-09-29 15:48 ` Chen, Tim C
2010-09-30 0:50 ` Alex,Shi
2010-09-30 2:01 ` Norbert Preining
2010-09-30 6:59 ` Norbert Preining
2010-09-30 8:27 ` Alex,Shi
2010-09-30 12:36 ` Peter Zijlstra
2010-09-30 13:21 ` Shi, Alex
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