linux-kernel - Re: [Bugme-new] [Bug 12562] New: High overhead while switching or synchronizing threads on different cores

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Date:	Thu, 29 Jan 2009 11:31:49 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Thomas Pilarski <thomas.pi@...or.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Gregory Haskins <ghaskins@...ell.com>,
	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 12562] New: High overhead while switching or
 synchronizing threads on different cores

On Thu, 2009-01-29 at 11:24 +0100, Thomas Pilarski wrote:
> Some explanation of the test program. 
> 
> ../schedulerissue 1 4096 8 2000
> 1 producer and 1 consumer
> buffer size of 4096 doubles * 8byte 
> 8 buffer (256kB total buffer)
> 2000 messages
> 
> ../schedulerissue 2 4096 8 2000
> 2 producer and 2 consumer
> buffer size of 4096 doubles * 8byte 
> 8 buffer (256kB total buffer)
> 2000 messages
> 
> 
> It was not 512KB bytes in the test before, but 4MB.
> But there is the same problem with a total buffer size of 48kB and 4
> threads (./schedulerissue 2 2048 3 20000).

Right, read the proglet (and removed that usleep(1)) and am poking at
it.

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