On Mon, Aug 23, 2004 at 11:41:19AM -0400, Brian Fundakowski Feldman wrote: > 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! Oops, let me clarify: "... before applying these changes." My system is very stable under normal workload after applying them, but I also could not make a -jwhatever buildworld hang for me previously like others could. -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green_at_FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\Received on Mon Aug 23 2004 - 14:19:40 UTC
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