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Message-ID: <29495f1d0702281620j43f576ack2d7e942136e8ea56@mail.gmail.com>
Date: Wed, 28 Feb 2007 16:20:54 -0800
From: "Nish Aravamudan" <nish.aravamudan@gmail.com>
To: "Bill Davidsen" <davidsen@tmr.com>
Subject: Re: SMP performance degradation with sysbench
Cc: "Paulo Marques" <pmarques@grupopie.com>, "Rik van Riel" <riel@redhat.com>,
       "=?ISO-8859-1?Q?J.A._Magall=F3n?=" <jamagallon@ono.com>,
       "Hiro Yoshioka" <hyoshiok@miraclelinux.com>, davej@redhat.com,
       harlan@artselect.com, nickpiggin@yahoo.com.au, l_allegrucci@yahoo.it,
       linux-kernel@vger.kernel.org, mingo@elte.hu, suparna@in.ibm.com,
       jens.axboe@oracle.com
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On 2/27/07, Nish Aravamudan <nish.aravamudan@gmail.com> wrote:
> On 2/27/07, Bill Davidsen <davidsen@tmr.com> wrote:
> > Paulo Marques wrote:
> > > Rik van Riel wrote:
> > >> J.A. Magall=F3n wrote:
> > >>> [...]
> > >>> Its the same to answer 4+4 queries than 8 at half the speed, isn't =
it ?
> > >>
> > >> That still doesn't fix the potential Linux problem that this
> > >> benchmark identified.
> > >>
> > >> To clarify: I don't care as much about MySQL performance as
> > >> I care about identifying and fixing this potential bug in
> > >> Linux.
> > >
> > > IIRC a long time ago there was a change in the scheduler to prevent a
> > > low prio task running on a sibling of a hyperthreaded processor to sl=
ow
> > > down a higher prio task on another sibling of the same processor.
> > >
> > > Basically the scheduler would put the low prio task to sleep during a=
n
> > > adequate task slice to allow the other sibling to run at full speed f=
or
> > > a while.
<snip>
> > > If that is the case, turning off CONFIG_SCHED_SMT would solve the pro=
blem.
<snip>
> > Note that Intel does make multicore HT processors, and hopefully when
> > this code works as intended it will result in more total throughput. My
> > supposition is that it currently is NOT working as intended, since
> > disabling SMT scheduling is reported to help.
>
> It does help, but we still drop off, clearly. Also, that's my
> baseline, so I'm not able to reproduce the *sharp* dropoff from the
> blog post yet.
>
> > A test with MC on and SMT off would be informative for where to look ne=
xt.
>
> I'm rebooting my box with 2.6.20.1 and exactly this setup now.

Here are the results:

idle.png: average % idle over 120s runs from 1 to 32 threads
transactions.png: TPS over 120s runs from 1 to 32 threads

Hope the data is useful. All I can conclude right now is that SMT
appears to help (contradicting what I said earlier), but that MC seems
to have no effect (or no substantial effect).

Thanks,
Nish

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