linux-kernel - Re: KS/Plumbers: c-state governor BOF

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Message-ID: <504F65A7.3040203@redhat.com>
Date:	Tue, 11 Sep 2012 12:24:07 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Youquan Song <youquan.song@...ux.intel.com>
CC:	Linux kernel Mailing List <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Boris Ostrovsky <boris.ostrovsky@....com>,
	Len Brown <len.brown@...el.com>,
	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>,
	ShuoX Liu <shuox.liu@...el.com>, youquan.song@...el.com
Subject: Re: KS/Plumbers: c-state governor BOF

On 09/12/2012 12:15 AM, Youquan Song wrote:
>> Your patches could make a lot of sense when integrated with my
>> patches:
>>
>> http://people.redhat.com/riel/cstate/
>> However, we should probably get the tracepoint upstream first,
>> so we can know for sure :)
>
> I can not access the patches at this directory. Can you send it to me?
> I will look at your patches and then integrated with my patches to look
> what will happen tomorrow.

Argh, fixed!

> Do you have test case share? or ideas how to show the benefit.
>
> I have done many test for my pathes. It show some benefit big or small
> in various cases, but there is no negative effect showed at least.
>
> I have two onviced test cases to show the great benefit
> 1.  turbostat v1 (before 3.5)
> 2. I write the simple test application which also show greate benefit.
> running it by #./idle_predict -l 8
>
>
> I write a simple application using usleep which it is clear to the
> repeat mode prediction failure will greatly effect the application with
> such repeat pattern.

Your test looks exactly like the kind of thing that could benefit
from my changes to the menu governor :)

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