linux-kernel - Re: Re: HT (Hyper Threading) aware process scheduling doesn't work as it should

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Message-ID: <20111031031907.GB18057@zhy>
Date:	Mon, 31 Oct 2011 11:19:07 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	"Artem S. Tashkinov" <t.artem@...os.com>
Cc:	arjan@...radead.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: Re: HT (Hyper Threading) aware process scheduling doesn't work
 as it should

On Sun, Oct 30, 2011 at 10:29:23PM +0000, Artem S. Tashkinov wrote:
> > On Oct 31, 2011, Arjan van de Ven wrote:
> >
> > On Sun, 30 Oct 2011 19:57:12 +0000 (GMT)
> > "Artem S. Tashkinov" wrote:
> >
> > > Hello,
> > >
> > > It's known that if you want to reach maximum performance on HT
> > > enabled Intel CPUs you should distribute the load evenly between
> > > physical cores, and when you have loaded all of them you should then
> > > load the remaining virtual cores.
> >
> > this is a bold statement, and patently false if you have to threads of
> > one process that heavily share data between eachother...
> > (but true for more independent workloads)
> 
> In my initial message I was talking about completely unrelated tasks/
> processes which share no data/instructions/whatever else. You don't
> need to trust my test case as you can carry out this test on your own.

(Cc'ing more people)

Maybe you can also show your test case here?

Thanks,
Yong
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