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

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Message-ID: <51DB75D4.6050302@linux.vnet.ibm.com>
Date:	Tue, 09 Jul 2013 10:30:44 +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

Thanks for the testing :)

On 07/09/2013 02:59 AM, Davidlohr Bueso wrote:
[snip]
>>
>> OK, I'll apply the patches, we'll see what happens. If there significant
>> fallout we'll immediately have more information anyway ;-)
> 
> So I gave the v2 a spin on my aim7 benchmark on an 80-core 8 socket
> DL980. Not much changed, most numbers are in the noise range, however,
> with HT off, the high_systime workload suffered in throughput with this
> patch with higher concurrency (after 600 users). Image attached.

To make sure I'm not on the wrong way... HT here means hyperthreading,
correct?

I have some questions like:
1. how do you disable the hyperthreading? by manual or some other way?
2. is the 3.10-rc5 in image also disabled the hyperthreading?
3. is the v3 patch set show the same issue?

Regards,
Michael Wang

> 
> Thanks,
> Davidlohr
> 

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