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

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Message-Id: <1233224644.5294.52.camel@bugs-laptop>
Date:	Thu, 29 Jan 2009 11:24:04 +0100
From:	Thomas Pilarski <thomas.pi@...or.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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

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).


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