linux-kernel - Re: RFC: revert request for cpuidle patches e11538d1 and 69a37bea

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Date:	Sat, 27 Jul 2013 02:22:53 -0400
From:	Len Brown <lenb@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Rik van Riel <riel@...hat.com>, Jeremy Eder <jeder@...hat.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	youquan.song@...el.com, paulmck@...ux.vnet.ibm.com,
	daniel.lezcano@...aro.org, "Brown, Len" <len.brown@...el.com>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: RFC: revert request for cpuidle patches e11538d1 and 69a37bea

>> OK, I'll queue up the reverts as fixes for 3.11-rc4.
>
> So, the reverts are on the fixes-next branch of the linux-pm.git tree that you
> can access at
>
> http://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/log/?h=fixes-next
>
> However, they are not simple reverts as we've had some non-trivial changes on
> top of those commits already, so I'd appreciate it a lot if somebody could
> double check if I didn't break anything in them.

I've verified that the reverts improve netperf TCP_RR performance.

Here I've got two Xeon's, slightly different, so I run in both directions.
Also I run two ways -- Out-of-the-box, plus with cpufreq
set to max frequency.  The reverts improve all 4 cases:

JKT → IVT                IVT → JKT

 3.11.0-rc2        baseline w/o revert                Out of Box

20420                19963
20658                19915
20298                20320

 3.11.0-rc2        baseline w/o revert                max freq

59658                51427
59663                51503
59416                51343

3.11.0-rc2-00002-g74bce39                        Linux-pm “fixes-next” branch

3.11.0-rc2-00002-g74bce39                Out of box
23227                22056
23306                22125
23387                40226                40k result saw some 2.2 ghz
vs 1.2 ghz in other runs
                21991

3.11.0-rc2-00002-g74bce39                Max-freq
67240                57645
64880                56764
65924                57435

Tested-by: Len Brown <len.brown@...el.com>

thanks,
Len Brown, Intel Open Source Technology Center
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