From: William Lee Irwin III <wli@holomorphy.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: Con Kolivas <kernel@kolivas.org>, Andrew Morton <akpm@osdl.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.0-test2-mm1 results
Date: Thu, 31 Jul 2003 14:19:58 -0700 [thread overview]
Message-ID: <20030731211958.GD15452@holomorphy.com> (raw)
In-Reply-To: <59900000.1059664740@[10.10.2.4]>
At some point in the past, Con Kolivas wrote:
>> How do we get around this? I'll be brave here and say I'm not sure
>> we need to, as cpu hogs have a knack of slowing things down for
>> everyone, and it is best not just for interactivity for this to
>> happen, but for fairness.
On Thu, Jul 31, 2003 at 08:19:01AM -0700, Martin J. Bligh wrote:
> Well, what you want to do is prioritise interactive tasks over cpu hogs.
> What *seems* to be happening is you're just switching between cpu hogs
> more ... that doesn't help anyone really. I don't have an easy answer
> for how to fix that, but it doesn't seem desireable to me - we need some
> better way of working out what's interactive, and what's not.
I don't believe so. You're describing the precise effect of finite-
quantum FB (or tiny quantum RR) on long-running tasks. Generally
multilevel queues are used to back off to a service-time dependent
queueing discipline (e.g. use RR with increasing quanta for each level
and use level promotion and demotion to discriminate interactive tasks,
which remain higher-priority since overall policy is FB) with longer
timeslices for such beasts for less context-switching overhead. I say
lengthen timeslices with service time and make priority preemption work.
-- wli
next prev parent reply other threads:[~2003-07-31 21:18 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-29 14:37 Panic on 2.6.0-test1-mm1 Martin J. Bligh
2003-07-29 21:18 ` Martin J. Bligh
2003-07-30 15:01 ` 2.6.0-test2-mm1 results Martin J. Bligh
2003-07-30 15:28 ` Con Kolivas
2003-07-30 16:27 ` Martin J. Bligh
2003-07-31 14:56 ` Martin J. Bligh
2003-07-31 15:13 ` Con Kolivas
2003-07-31 15:19 ` Martin J. Bligh
2003-07-31 15:35 ` Con Kolivas
2003-07-31 16:01 ` Martin J. Bligh
2003-07-31 16:11 ` Con Kolivas
2003-07-31 21:19 ` William Lee Irwin III [this message]
2003-07-31 17:03 ` Bill Davidsen
2003-07-31 22:37 ` Panic on 2.6.0-test1-mm1 William Lee Irwin III
2003-07-31 22:41 ` William Lee Irwin III
2003-07-31 22:40 ` Andrew Morton
2003-08-01 0:15 ` William Lee Irwin III
2003-08-01 0:18 ` Zwane Mwaikambo
2003-08-01 0:20 ` William Lee Irwin III
2003-08-01 0:47 ` Martin J. Bligh
2003-08-01 0:53 ` William Lee Irwin III
2003-08-01 0:57 ` Martin J. Bligh
2003-08-01 1:02 ` William Lee Irwin III
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