From: Bill Huey (hui) <billh@gnuppy.monkey.org>
To: Chris Snook <csnook@redhat.com>
Cc: Chris Friesen <cfriesen@nortel.com>,
Tong Li <tong.n.li@intel.com>,
mingo@elte.hu, linux-kernel@vger.kernel.org,
"Bill Huey (hui)" <billh@gnuppy.monkey.org>,
Con Kolivas <kernel@kolivas.org>
Subject: Re: [RFC] scheduler: improve SMP fairness in CFS
Date: Tue, 24 Jul 2007 14:06:07 -0700 [thread overview]
Message-ID: <20070724210607.GB32582@gnuppy.monkey.org> (raw)
In-Reply-To: <46A66393.5000705@redhat.com>
On Tue, Jul 24, 2007 at 04:39:47PM -0400, Chris Snook wrote:
> Chris Friesen wrote:
>> We currently use CKRM on an SMP machine, but the only way we can get away
>> with it is because our main app is affined to one cpu and just about
>> everything else is affined to the other.
>
> If you're not explicitly allocating resources, you're just low-latency, not
> truly realtime. Realtime requires guaranteed resources, so messing with
> affinities is a necessary evil.
You've mentioned this twice in this thread. If you're going to talk about this
you should characterize this more specifically because resource allocation is
a rather incomplete area in the Linux. Rebalancing is still an open research
problem the last time I looked.
Tong's previous trio patch is an attempt at resolving this using a generic
grouping mechanism and some constructive discussion should come of it.
bill
next prev parent reply other threads:[~2007-07-24 21:34 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-23 18:38 Tong Li
2007-07-23 20:00 ` Andi Kleen
2007-07-23 21:10 ` Li, Tong N
2007-07-23 21:25 ` Chris Friesen
2007-07-24 9:43 ` Andi Kleen
2007-07-23 23:40 ` Chris Snook
2007-07-24 8:07 ` Chris Snook
2007-07-24 17:11 ` Li, Tong N
2007-07-24 17:07 ` Tong Li
2007-07-24 18:08 ` Chris Snook
2007-07-24 19:47 ` Chris Friesen
2007-07-24 20:39 ` Chris Snook
2007-07-24 20:58 ` Li, Tong N
2007-07-24 21:09 ` Chris Snook
2007-07-24 21:23 ` Chris Friesen
2007-07-24 21:45 ` Chris Snook
2007-07-24 23:33 ` Chris Friesen
2007-07-24 21:06 ` Bill Huey [this message]
2007-07-24 21:22 ` Chris Snook
2007-07-24 23:14 ` Bill Huey
2007-07-24 21:12 ` Chris Friesen
2007-07-25 11:01 ` Ingo Molnar
2007-07-25 12:03 ` Ingo Molnar
2007-07-25 17:23 ` Tong Li
2007-07-25 19:24 ` Ingo Molnar
2007-07-25 20:38 ` Chris Friesen
2007-07-25 20:55 ` Chris Snook
2007-07-25 21:15 ` Li, Tong N
2007-07-25 22:24 ` Chris Snook
2007-07-26 19:00 ` Tong Li
2007-07-26 21:31 ` Ingo Molnar
2007-07-26 22:00 ` Li, Tong N
2007-07-27 1:34 ` Tong Li
2007-07-27 17:16 ` Chris Snook
2007-07-27 19:03 ` Tong Li
2007-07-27 22:20 ` Bill Huey
2007-07-27 23:36 ` Chris Snook
2007-07-28 0:54 ` Bill Huey
2007-07-28 2:59 ` Chris Snook
2007-07-28 19:38 ` Tong Li
2007-07-29 2:40 ` Chris Snook
2007-07-28 19:23 ` Tong Li
2007-07-29 3:01 ` Chris Snook
2007-07-25 18:20 ` Li, Tong N
2007-07-25 19:18 ` Ingo Molnar
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