linux-kernel - Re: [PATCH 1/2] sched: fix and clean up calculate

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Message-ID: <53D7C01B.9060801@redhat.com>
Date:	Tue, 29 Jul 2014 11:39:07 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Michael Neuling <mikey@...ling.org>,
	Ingo Molnar <mingo@...nel.org>, jhladky@...hat.com,
	ktkhai@...allels.com, tim.c.chen@...ux.intel.com,
	Nicolas Pitre <nicolas.pitre@...aro.org>
Subject: Re: [PATCH 1/2] sched: fix and clean up calculate_imbalance

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On 07/29/2014 11:31 AM, Vincent Guittot wrote:
> On 29 July 2014 16:53, Rik van Riel <riel@...hat.com> wrote:
>> I cannot think of any case where keeping the "overloaded" code
>> would result in the code behaving differently over the long
>> term.
> 
>> What am I overlooking?
> 
> IIUC the load_above_capacity is there to prevent the busiest group
> to become idle and you remove that protection

Having the busiest group become partially idle is perfectly fine,
as long as there is also spare capacity in the destination group.

Spreading out the work load over more CPU sockets, with more CPU
cache and more total available memory bandwidth is often a good
thing.

- -- 
All rights reversed
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