linux-kernel - RE: [PATCH] sched: Folding nohz load accounting more accurate

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Date:	Sun, 17 Jun 2012 23:41:59 -0700
From:	"Doug Smythies" <dsmythies@...us.net>
To:	"'Peter Zijlstra'" <peterz@...radead.org>,
	"'Charles Wang'" <muming.wq@...il.com>
Cc:	<linux-kernel@...r.kernel.org>, "'Ingo Molnar'" <mingo@...hat.com>,
	"'Tao Ma'" <tm@....ma>,
	'含黛' <handai.szj@...bao.com>,
	"'Doug Smythies'" <dsmythies@...us.net>
Subject: RE: [PATCH] sched: Folding nohz load accounting more accurate


>> On 2012.06.15 10:40 -0700, Peter Zijlstra wrote:
>  On 2012.06.16 07:53 -0700, Doug Smythies wrote:

>> In the meantime I thought I might as well post this.. who knows somebody
>> might be bored over the weekend, it might actually work, or not :-)

> I back edited your changes into my working kernel (3.2 based),
> in addition to the other back edits which had it at the
> equivalent of 3.5 RC2 with respect to this stuff.

> I did only the quick test, as described previously:
> Selected 2 processes, 90 Hertz per process, and 0.15 load each
> For an actual load of 0.30 total and a previously Reported Load
> Average of ~1.5. Command used for the load testing program:

> ./waiter 2 1800 900 345912 9444 1

> Long term Reported Load Average was ~1.8.

Another data point: 8 processes, actual load = 6.34, 150 Hz sleep
frequency per process:

Kernel 3.5 RC2 reported load average ~= 3.9
Kernel with Peter code reported load average ~= 7.9



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