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

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From: Ingo Molnar

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

Date: Thursday, August 28, 2008 - 9:25 am

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

quoted text> 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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Messages in current thread:

[PATCH 6/6] sched: disabled rt-bandwidth by default, Peter Zijlstra, (Tue Aug 19, 3:33 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Tue Aug 19, 4:05 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Tue Aug 19, 4:11 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Tue Aug 19, 4:17 am)

[PATCH] sched: extract walk_tg_tree(), fix, Ingo Molnar, (Tue Aug 19, 4:42 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Tue Aug 19, 5:59 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Max Krasnyansky, (Tue Aug 19, 11:15 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Wed Aug 20, 4:56 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Tue Aug 26, 2:00 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Tue Aug 26, 2:30 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Tue Aug 26, 2:44 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Tue Aug 26, 2:54 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Tue Aug 26, 3:29 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Tue Aug 26, 4:03 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Thomas Gleixner, (Tue Aug 26, 4:09 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Tue Aug 26, 4:27 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Theodore Tso, (Tue Aug 26, 5:50 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Stefani Seibold, (Tue Aug 26, 6:31 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Mark Hounschell, (Tue Aug 26, 6:47 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Theodore Tso, (Tue Aug 26, 10:55 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Thomas Gleixner, (Tue Aug 26, 2:37 pm)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Andi Kleen, (Tue Aug 26, 3:49 pm)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Steven Rostedt, (Tue Aug 26, 4:00 pm)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Wed Aug 27, 3:04 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Wed Aug 27, 3:08 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Chris Friesen, (Wed Aug 27, 11:55 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Thu Aug 28, 3:54 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Andi Kleen, (Thu Aug 28, 4:09 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Peter Zijlstra, (Thu Aug 28, 4:19 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Thu Aug 28, 4:28 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Andi Kleen, (Thu Aug 28, 4:50 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Peter Zijlstra, (Thu Aug 28, 5:00 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Thu Aug 28, 5:03 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Andi Kleen, (Thu Aug 28, 5:14 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Thu Aug 28, 5:18 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Thu Aug 28, 5:29 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Thu Aug 28, 6:07 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Thu Aug 28, 6:45 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Steven Rostedt, (Thu Aug 28, 7:15 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Thu Aug 28, 7:30 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Thu Aug 28, 7:36 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Steven Rostedt, (Thu Aug 28, 8:12 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Thu Aug 28, 8:34 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Steven Rostedt, (Thu Aug 28, 8:50 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Peter Zijlstra, (Thu Aug 28, 9:05 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Steven Rostedt, (Thu Aug 28, 9:15 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Max Krasnyansky, (Thu Aug 28, 9:19 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Ingo Molnar, (Thu Aug 28, 9:25 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Peter Zijlstra, (Thu Aug 28, 9:29 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Andi Kleen, (Thu Aug 28, 9:33 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Max Krasnyansky, (Thu Aug 28, 9:33 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, John Kacur, (Thu Aug 28, 10:22 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Linus Torvalds, (Thu Aug 28, 10:26 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Steven Rostedt, (Thu Aug 28, 11:04 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Darren Hart, (Thu Aug 28, 11:10 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Mark Hounschell, (Thu Aug 28, 11:16 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Linus Torvalds, (Thu Aug 28, 11:42 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Steven Rostedt, (Thu Aug 28, 11:53 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Stefani Seibold, (Thu Aug 28, 12:39 pm)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Alan Cox, (Thu Aug 28, 1:53 pm)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Mike Galbraith, (Fri Aug 29, 12:56 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Peter Zijlstra, (Fri Aug 29, 1:06 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Mike Galbraith, (Fri Aug 29, 1:47 am)

Re: [PATCH 6/6] sched: disabled rt-bandwidth by default, Nick Piggin, (Fri Aug 29, 11:33 pm)

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