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Date: Mon, 23 Aug 2004 10:43:43 -0700
From: Julian Elischer <julian@elischer.org>
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To: "Simon L. Nielsen" <simon@freebsd.org>
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cc: freebsd-current@freebsd.org
Subject: Re: PLEASE TEST: IPI deadlock avoidance patch
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Now to start work on the preemption hangs..


Simon L. Nielsen wrote:

>On 2004.08.22 12:05:39 -0700, Doug White wrote:
>  
>
>>Hey folks,
>>
>>If you have a reasonably fast i386 or amd64 multiprocessor and/or
>>hyperthreading machine and are experiencing reproducible hangs during -j
>>buildwords and other highly parallel operations, please try this patch:
>>
>>http://people.freebsd.org/~dwhite/smp_rv_mtx.patch
>>    
>>
>
>With stock CURRENT my Dual XEON test system has hung most of the time
>when I did a parallel buildworld.  Since I applied this patch last
>night the system has completed 12 -j100 buildworlds, and it's still
>going on, without any problems :-).
>
>Thanks to all the people who have worked on this problem! :-)
>
>BTW. these tests were with the 4BSD scheduler, I'm going to try to
>switch to ULE soon and se how that works out.
>
>  
>