linux-kernel - Re: [PATCH 2/4] ipc/sem: seperate wait-for-zero and alter tasks into seperate queues

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Message-ID: <51A9E062.3040208@colorfullife.com>
Date:	Sat, 01 Jun 2013 13:52:02 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Rik van Riel <riel@...hat.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr.bueso@...com>, hhuang@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 2/4] ipc/sem: seperate wait-for-zero and alter tasks into
 seperate queues

Hi all,

On 06/01/2013 11:20 AM, Manfred Spraul wrote:
>
> - osim [i.e.: with reschedules] is much slower: around 21 us per 
> schedule.
>     Perhaps the scheduler didn't pair the threads optimally: intra-cpu 
> reschedules
>     take around 2 us on my i3, inter-cpu reschedules around 16 us.
>
I mixed up numbers.
osim reports around 1.6 us for the 64-thread system.
It is still odd that it is only factor 1.5 facter than my 4-thread i3, 
but at least it is not slower.

Anyway: I have attached the table of all results that I have so far.

--
     Manfred

Download attachment "Eval-ipc.ods" of type "application/vnd.oasis.opendocument.spreadsheet" (22645 bytes)