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

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Message-ID: <53E33D39.7040706@intel.com>
Date:	Thu, 07 Aug 2014 16:47:53 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	Gene Heskett <gheskett@...v.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 2014年08月06日 21:57, Gene Heskett wrote:
> 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.

Hi Gene:
	Sorry. I meant the config file I attached in the my last reply.

>>
>> -----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
> 


-- 
Best regards
Tianyu Lan

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