linux-kernel - Re: high power consumption in recent kernels

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1278615991.1900.187.camel@laptop>
Date:	Thu, 08 Jul 2010 21:06:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Norbert Preining <preining@...ic.at>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	akpm <akpm@...ux-foundation.org>, Mike Galbraith <efault@....de>,
	tglx <tglx@...utronix.de>
Subject: Re: high power consumption in recent kernels

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..
--
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/