From: Con Kolivas <con@kolivas.org>
To: "Artem S. Tashkinov" <t.artem@lycos.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: HT (Hyper Threading) aware process scheduling doesn't work as it should
Date: Mon, 31 Oct 2011 21:06:29 +1100 [thread overview]
Message-ID: <1479015.f2tEjKr9vR@quad> (raw)
In-Reply-To: <269467866.49093.1320004632156.JavaMail.mail@webmail17>
On Sun, 30 Oct 2011 07:57:12 PM Artem S. Tashkinov wrote:
> I've found out that even on Linux 3.0.8 the process scheduler doesn't
> correctly distributes the load amongst virtual CPUs. E.g. on a 4-core
> system (8 total virtual CPUs) the process scheduler often run some
> instances of four different tasks on the same physical CPU.
> Any thoughts? comments? I think this is quite a serious problem.
Intense cache locality logic, power saving concepts, cpu frequency governor
behaviour and separate runqueues per CPU within the current CPU process
scheduler in the current mainline linux kernel will ocasionally do this. Some
workloads will be better, while others will be worse. Feel free to try my BFS
cpu scheduler if you wish a CPU process scheduler that spreads work more
evenly across CPUs.
Alas the last version I synced up with will not apply cleanly past about 3.0.6
I believe:
http://ck.kolivas.org/patches/bfs/3.0.0/3.0-sched-bfs-413.patch
Regards,
Con Kolivas
--
-ck
next prev parent reply other threads:[~2011-10-31 10:17 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-30 19:57 HT (Hyper Threading) aware process scheduling doesn't work as it should Artem S. Tashkinov
2011-10-30 21:26 ` Henrique de Moraes Holschuh
2011-10-30 21:51 ` Artem S. Tashkinov
2011-10-31 9:16 ` Henrique de Moraes Holschuh
2011-10-31 9:40 ` Artem S. Tashkinov
2011-10-31 11:58 ` Henrique de Moraes Holschuh
2011-11-01 4:14 ` Zhu Yanhai
2011-11-01 5:15 ` ffab ffa
2011-10-31 18:59 ` Chris Friesen
2011-11-01 6:01 ` Mike Galbraith
2011-10-30 22:12 ` Arjan van de Ven
2011-10-30 22:29 ` Artem S. Tashkinov
2011-10-31 3:19 ` Yong Zhang
2011-10-31 8:18 ` Artem S. Tashkinov
2011-10-31 10:06 ` Con Kolivas [this message]
2011-10-31 11:42 ` Mike Galbraith
2011-11-01 0:41 ` Con Kolivas
2011-11-01 0:58 ` Gene Heskett
2011-11-01 5:08 ` Mike Galbraith
2011-11-03 8:18 ` Ingo Molnar
2011-11-03 9:44 ` Artem S. Tashkinov
2011-11-03 10:29 ` Ingo Molnar
2011-11-03 12:42 ` Henrique de Moraes Holschuh
2011-11-03 13:06 ` Artem S. Tashkinov
2011-11-03 13:00 ` Mike Galbraith
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