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Date:	Wed, 5 Dec 2007 21:46:46 +0100
From:	Ingo Molnar <>
To:	Jie Chen <>
Cc:	Simon Holm Th??gersen <>,
	Eric Dumazet <>,,
	Peter Zijlstra <>
Subject: Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4

* Jie Chen <> wrote:

> I just disabled the affinity mask and reran the test. There were no 
> significant changes for two threads (barrier overhead is around 9 
> microseconds). As for 8 threads, the barrier overhead actually drops a 
> little, which is good. Let me know whether I can be any help. Thank 
> you very much.

sorry to be dense, but could you give me instructions how i could remove 
the affinity mask and test the "barrier overhead" myself? I have built 
"pthread_sync" and it outputs numbers for me - which one would be the 
barrier overhead: Reference_time_1 ?

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