linux-kernel - Re: [PATCH] sched: smart wake-affine

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Message-ID: <51E38517.5040300@linux.vnet.ibm.com>
Date:	Mon, 15 Jul 2013 13:13:59 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Davidlohr Bueso <davidlohr.bueso@...com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Alex Shi <alex.shi@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH] sched: smart wake-affine

Hi, Davidlohr

On 07/09/2013 10:52 AM, Michael Wang wrote:
> On 07/09/2013 10:36 AM, Davidlohr Bueso wrote:
> [snip]
>>> 2. is the 3.10-rc5 in image also disabled the hyperthreading?
>>
>> Yes, I happened to have data already collected for 3.10-rc5. While the
>> runs with this patch was with -rc7, unless there was some performance
>> related commit I missed, I don't think the performance difference was
>> because of that.
>>
>>> 3. is the v3 patch set show the same issue?
>>
>> Uhmmm shoot, I didn't realize there was a v3, sorry about that.
>>
>> /me takes another look at the thread.
> 
> V3 will reduce the overhead, should make things better, especially when
> workload is high and platform is big (your box is really what I desired
> ;-), honestly).
> 
> And if it is possible, comparison based on the same basement will be
> better :)

I have done some tests with reaim high_systime workfile, and I could not
find regression on my box (the tool itself has some issue, but I got the
results), v3 works well.

I suppose the issue have been addressed, but please let us know if v3
also show regression on your box, we could try to solve the problem ;-)

Regards,
Michael Wang

> 
> Regards,
> Michael Wang
> 
>>
>> Thanks,
>> Davidlohr
>>
> 
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