From: Mike Galbraith <efault@gmx.de>
To: Chris Friesen <chris.friesen@genband.com>
Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
"Artem S. Tashkinov" <t.artem@lycos.com>,
linux-kernel@vger.kernel.org
Subject: Re: HT (Hyper Threading) aware process scheduling doesn't work as it should
Date: Tue, 01 Nov 2011 07:01:46 +0100 [thread overview]
Message-ID: <1320127306.6305.82.camel@marge.simson.net> (raw)
In-Reply-To: <4EAEF004.8070005@genband.com>
On Mon, 2011-10-31 at 12:59 -0600, Chris Friesen wrote:
> I created a tiny cpu burner program that just busy-loops. Running two
> instances on my system they were always scheduled on separate physical
> cpus regardless of the values in sched_mc_power_savings or
> sched_smt_power_savings.
A wakeup driven load using sync wakeup hint will wake to siblings of the
same core if there's too not too much imbalance though. Whether that's
good or bad.. depends.
If you turn SD_SHARE_PKG_RESOURCES off in the sibling sched domain,
wakees should be awakened CPU affine in sync hint case, or on separate
cores in no sync hint case. They are here anyway.
-Mike
next prev parent reply other threads:[~2011-11-01 6:01 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 [this message]
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
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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