PLEASE TEST: IPI deadlock avoidance patch
Brian Fundakowski Feldman
green at freebsd.org
Mon Aug 23 08:41:20 PDT 2004
On Sun, Aug 22, 2004 at 12:05:39PM -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
>
> This patch avoids a deadlock between the smp_rendezvous() mechanism and
> TLB shootdowns via pmap by forcing them to share a mutex. The patch has
> been tested on several multiproc Xeon systems and a dual Opteron I have
> here and is stable, but a couple of more eyeballs and varied loads
> wouldn't hurt since this will be going into RELENG_5.
>
> If there's anything glaringly wrong from a style point of view, let me
> know too.
>
> I plan on committing this late Monday or Tuesday, barring any serious
> problems.
>
> Thanks to alc for the nudge on the solution and rwatson for staying up
> late and testing it on his hardware.
I couldn't even run portupgrade without a hard hang on my Athlon!
--
Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\
<> green at FreeBSD.org \ The Power to Serve! \
Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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