linux-kernel - Re: question on sched-rt group allocation cap: sched_rt_runtime

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Message-Id: <FC8E625F-CF9B-4943-8D09-F7D474834A69@anirban.org>
Date:	Sun, 6 Sep 2009 17:28:23 -0700
From:	Anirban Sinha <ani@...rban.org>
To:	Anirban Sinha <ASinha@...gmasystems.com>,
	Dario Faggioli <raistlin@...ux.it>, a.p.zijlstra@...llo.nl,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Fabio Checconi <fchecconi@...il.com>
Cc:	Anirban Sinha <ani@...rban.org>
Subject: Re: question on sched-rt group allocation cap: sched_rt_runtime_us


 > Dunno.  Fly or die little patchlet (toss).

 > sched: allow the user to disable RT bandwidth aggregation.

Hmm. Interesting. With this change, my results are as follows:

rt_runtime/rt_period   % of reg iterations

0.2                    100%
0.25                   100%
0.3                    100%
0.4                    100%
0.5                    82%
0.6                    66%
0.7                    54%
0.8                    46%
0.9                    38.5%
0.95                   32%


This results are on a quad core blade. Does it still makes sense though?
Can anyone else run the same tests on a quadcore over the latest kernel?
I will patch our 2.6.26 kernel with upstream fixes and rerun these  
tests on tuesday.

Ani




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