linux-kernel - Re: Real-time scheduling policies and hyper-threading

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Date:	Fri, 25 Apr 2014 15:12:11 +0400
From:	Roman Gushchin <klamm@...dex-team.ru>
To:	Kirill Tkhai <tkhai@...dex.ru>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Artyom Tarasenko <atar4qemu@...il.com>
Subject: Re: Real-time scheduling policies and hyper-threading

25.04.2014, 00:16, "Kirill Tkhai" <tkhai@...dex.ru>:
> 24.04.2014, 22:59, "Peter Zijlstra" <peterz@...radead.org>:
>
> [snip]
>
>>>   Does anyone use rt-scheduler for runtime-like cpu-bound tasks?
>>  So in general cpu bound tasks in the RT classes (FIFO/RR/DEADLINE) are
>>  bad and can make the system go funny.
>>
>>  For general system health it is important that various system tasks
>>  (kthreads usually) can run. Many of these kthreads run at !rt prios, and
>>  by having cpu bound tasks in rt prios they don't get to run.
>
> One more word to this. I had such expirience on 2.6.33 kernel with RT patch
> and weak hardware (sparc32).
>
> Networking was actively used and application did not use any IO operations.
>
> User needs to set all RT priorities by himself. It's necessary to set RT
> priorities at least for softirqs and rcus. RT bandwidth must be switched
> off.

I disable RT bandwidth sharing and change rt_period/rt_runtime to 1/100 ms
respectively.

Thanks,
Roman
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