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

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Message-ID: <20140806110748.GC27033@pd.tnic>
Date:	Wed, 6 Aug 2014 13:07:48 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Lan Tianyu <tianyu.lan@...el.com>
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" <todd.e.brandt@...el.com>
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.
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