linux-kernel - Re: [PATCH] X86/CPU: Avoid 100ms sleep for cpu offline during S3

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Message-Id: <201408060957.59268.gheskett@wdtv.com>
Date:	Wed, 6 Aug 2014 09:57:58 -0400
From:	Gene Heskett <gheskett@...v.com>
To:	"Lan, Tianyu" <tianyu.lan@...el.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
	"toshi.kani@...com" <toshi.kani@...com>,
	"imammedo@...hat.com" <imammedo@...hat.com>,
	"jan.kiszka@...mens.com" <jan.kiszka@...mens.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"huawei.libin@...wei.com" <huawei.libin@...wei.com>,
	"prarit@...hat.com" <prarit@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Brandt, Todd E" <todd.e.brandt@...el.com>
Subject: Re: [PATCH] X86/CPU: Avoid 100ms sleep for cpu offline  during S3

On Wednesday 06 August 2014, Lan, Tianyu wrote:
>Have you tried my attached kernel config file? When someone reported
>the issue to me, I also was very hard to reproduce the issue by my own
>config file. Maybe once 100 tries. But I can reproduced the issue every
>time with the attached configure file on several my machines and even
>on server.

There was no attachment.
>
>-----Original Message-----
>From: Borislav Petkov [mailto:bp@...en8.de]
>Sent: Wednesday, August 06, 2014 7:08 PM
>To: Lan, Tianyu
>Cc: tglx@...utronix.de; mingo@...hat.com; hpa@...or.com; x86@...nel.org;
>toshi.kani@...com; imammedo@...hat.com; jan.kiszka@...mens.com;
>mingo@...nel.org; huawei.libin@...wei.com; prarit@...hat.com;
>linux-kernel@...r.kernel.org; Brandt, Todd E Subject: Re: [PATCH]
>X86/CPU: Avoid 100ms sleep for cpu offline during S3
>
>On Tue, Aug 05, 2014 at 05:29:18PM +0800, Lan Tianyu wrote:
>> I think you can pull Tod's tool from git hub and do test from your
>> laptop. I attached a configure file come from ubuntu which is easier
>> to produce the issue. You can use it to reproduce the issue.
>
>Right, so I ran it on an old dualcore AMD laptop I have lying around
>here and it didn't show any difference with or without your patch.
>
>For all 4 runs I did with the tool running it without any arguments (so
>it did the default thing), I got suspend time for CPU1 of 4-6 msec and
>resume of ~20msec.
>
>I don't know whether it is the dual core or AMD but your patch doesn't
>change anything on that laptop which is ok, I'd guess.
>
>> Ok. BTW, I have tested it on the Ivbridge and Haswell machines.
>
>Yeah, add those numbers to the commit message too.
>
>Thanks.
>
>--
>Regards/Gruss,
>    Boris.
>
>Sent from a fat crate under my desk. Formatting is fine.
>--


Cheers, Gene Heskett
-- 
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