linux-kernel - Re: Network slowdown due to CFS

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Message-ID: <4701323F.3000500@nortel.com>
Date:	Mon, 01 Oct 2007 11:45:35 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jarek Poplawski <jarkao2@...pl>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	David Schwartz <davids@...master.com>,
	linux-kernel@...r.kernel.org, Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Martin Michlmayr <tbm@...ius.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...ux-foundation.org>
Subject: Re: Network slowdown due to CFS

Ingo Molnar wrote:
> * Chris Friesen <cfriesen@...tel.com> wrote:

>>However, there are closed-source and/or frozen-source apps where it's 
>>not practical to rewrite or rebuild the app.  Does it make sense to 
>>break the behaviour of all of these?
> 
> 
> See the background and answers to that in:
> 
>    http://lkml.org/lkml/2007/9/19/357
>    http://lkml.org/lkml/2007/9/19/328
> 
> there's plenty of recourse possible to all possible kinds of apps. Tune 
> the sysctl flag in one direction or another, depending on which behavior 
> the app is expecting.

Yeah, I read those threads.

It seems like the fundamental source of the disconnect is that the tasks 
used to be sorted by priority (thus making it easy to bump a yielding 
task to the end of that priority level) while now they're organized by 
time (making it harder to do anything priority-based).  Do I have that 
right?

Chris
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