Subject: Re: [Bugme-new] [Bug 12562] New: High overhead while switching or
 synchronizing threads on different cores
From: Thomas Pilarski <thomas.pi@arcor.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>, Mike Galbraith <efault@gmx.de>,
       Gregory Haskins <ghaskins@novell.com>, bugme-daemon@bugzilla.kernel.org,
       linux-kernel@vger.kernel.org
In-Reply-To: <1233223979.5294.41.camel@bugs-laptop>
References: <bug-12562-10286@http.bugzilla.kernel.org/>
	 <20090128125604.94ed3fe0.akpm@linux-foundation.org>
	 <1233181507.6988.14.camel@bugs-laptop>  <1233220048.7835.19.camel@twins>
	 <1233223979.5294.41.camel@bugs-laptop>
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Date: Thu, 29 Jan 2009 11:24:04 +0100
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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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