From: Peter Zijlstra <peterz@infradead.org>
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
"Ma, Ling" <ling.ma@intel.com>,
"Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
"ego@in.ibm.com" <ego@in.ibm.com>,
"svaidy@linux.vnet.ibm.com" <svaidy@linux.vnet.ibm.com>
Subject: Re: change in sched cpu_power causing regressions with SCHED_MC
Date: Fri, 19 Feb 2010 20:52:12 +0100 [thread overview]
Message-ID: <1266609132.1529.756.camel@laptop> (raw)
In-Reply-To: <1266604594.2814.37.camel@sbs-t61.sc.intel.com>
On Fri, 2010-02-19 at 10:36 -0800, Suresh Siddha wrote:
> > About the ping-pong for the statically infeasible scenario, the problem
> > with that is that we actually want to ping-pong a little [*], so we
> > might want to look at maybe doing a sd->next_pingpong jiffy measure to
> > allow some of that.
> >
> > [*] I've seen people pretty upset about the fact that when they start 6
> > similar loads on a quad cpu the tasks will not finish in roughly similar
> > times.
>
> I thought we were doing this (ping-ping a little) already. Unless
> something broke here also. I thought fix_small_imbalance() takes care of
> this too.
I'm not sure we do, when I test on the patched kernel I see two distinct
groups of runtime appear (haven't checked the unpatched one, but I doubt
it'll be better).
next prev parent reply other threads:[~2010-02-19 19:52 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-13 1:14 [patch] sched: fix SMT scheduler regression in find_busiest_queue() Suresh Siddha
2010-02-13 1:31 ` change in sched cpu_power causing regressions with SCHED_MC Suresh Siddha
2010-02-13 10:36 ` Peter Zijlstra
2010-02-13 10:42 ` Peter Zijlstra
2010-02-13 18:37 ` Vaidyanathan Srinivasan
2010-02-13 18:49 ` Suresh Siddha
2010-02-13 18:39 ` Vaidyanathan Srinivasan
2010-02-19 2:16 ` Suresh Siddha
2010-02-19 12:32 ` Arun R Bharadwaj
2010-02-19 13:03 ` Vaidyanathan Srinivasan
2010-02-19 19:15 ` Suresh Siddha
2010-02-19 14:05 ` Peter Zijlstra
2010-02-19 18:36 ` Suresh Siddha
2010-02-19 19:47 ` Peter Zijlstra
2010-02-19 19:50 ` Suresh Siddha
2010-02-19 20:02 ` Peter Zijlstra
2010-02-20 1:13 ` Suresh Siddha
2010-02-22 18:50 ` Peter Zijlstra
2010-02-24 0:13 ` Suresh Siddha
2010-02-24 17:43 ` Peter Zijlstra
2010-02-24 19:31 ` Suresh Siddha
2010-02-26 10:24 ` [tip:sched/core] sched: Fix SCHED_MC regression caused by change in sched cpu_power tip-bot for Suresh Siddha
2010-02-26 14:55 ` tip-bot for Suresh Siddha
2010-02-19 19:52 ` Peter Zijlstra [this message]
2010-02-13 18:33 ` change in sched cpu_power causing regressions with SCHED_MC Vaidyanathan Srinivasan
2010-02-13 18:27 ` [patch] sched: fix SMT scheduler regression in find_busiest_queue() Vaidyanathan Srinivasan
2010-02-13 18:39 ` Suresh Siddha
2010-02-13 18:56 ` Vaidyanathan Srinivasan
2010-02-13 20:25 ` Vaidyanathan Srinivasan
2010-02-13 20:36 ` Vaidyanathan Srinivasan
2010-02-14 10:11 ` Peter Zijlstra
2010-02-15 12:35 ` Vaidyanathan Srinivasan
2010-02-15 13:00 ` Peter Zijlstra
2010-02-16 15:59 ` Vaidyanathan Srinivasan
2010-02-16 17:28 ` Peter Zijlstra
2010-02-16 18:25 ` Vaidyanathan Srinivasan
2010-02-16 18:46 ` Vaidyanathan Srinivasan
2010-02-16 18:48 ` Peter Zijlstra
2010-02-15 22:29 ` Peter Zijlstra
2010-02-16 14:16 ` [tip:sched/urgent] sched: Fix " tip-bot for Suresh Siddha
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