linux-kernel - Re: [PATCH 6/6] sched: disabled rt-bandwidth by default

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Message-ID: <20080828162548.GA3826@elte.hu>
Date:	Thu, 28 Aug 2008 18:25:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Max Krasnyansky <maxk@...lcomm.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefani Seibold <stefani@...bold.net>,
	Dario Faggioli <raistlin@...ux.it>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 6/6] sched: disabled rt-bandwidth by default


* Max Krasnyansky <maxk@...lcomm.com> wrote:

> Andi Kleen wrote:
>> On Thu, Aug 28, 2008 at 01:19:13PM +0200, Peter Zijlstra wrote:
>>> On Thu, 2008-08-28 at 13:09 +0200, Andi Kleen wrote:
>>>>> Even if the system has multiple CPUs, and even if just a single CPU is
>>>>> fully utilized by an RT task, without the rt-limit the system will still
>>>>> lock up in practice due to various other factors: workqueues and tasks
>>>>> being 'stuck' on CPUs that host an RT hog.
>>>> The load balancer will not notice that a particular CPU is busy
>>>> with real time tasks?
>>> Not currently, working on that though.
>>
>> I wonder if it would make sense to break affinities in extreme case?
>> With that even the workqueues would work again.
>
> Please lets not break affinity :).

correct, breaking affinity is a rather stupid idea.

	Ingo
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