Date: Sun, 26 Mar 2000 13:37:50 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Alfred Perlstein <bright@wintelcom.net>, freebsd-current@freebsd.org Subject: Re: SMP/BGL patch 04 Message-ID: <Pine.BSF.4.21.0003261333440.89245-100000@salmon.nlsystems.com> In-Reply-To: <200003250216.SAA18264@apollo.backplane.com>
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On Fri, 24 Mar 2000, Matthew Dillon wrote: > Patch 04 is ready. > > http://www.backplane.com/FreeBSD4/ > http://www.backplane.com/FreeBSD4/smp-patch-04.diff > > Contains lots of cleanup of stale SMP code. There are still a few places > where get_mplock is being called with interrupts disabled which I haven't > found, so I put the sti test back in. > > I also removed the FAST_SIMPLELOCK optimization, which had been turned > on - mainly because it's not useful if we are moving to an interrupt > thread scheme (as in it's still a global interrupt lock, whereas the > thread scheme will allow concurrent interrupt execution), but also > because it makes too many assumptions about what can run outside the > MP lock. > > I'm going to let people bang on this for a few days, and then I think > it should be committed into -CURRENT (5.x) in order to allow people > to start banging on optimizing the BGL/syscall paths. All comments > welcome (but not necessary acted upon) :-). I haven't looked at the patch so I can't comment on it (but it sounds very promising). I have been writing some of the infrastructure for SMP on alpha and as an experiment I've been using the mutex_t primitive from BSD/OS as an experiment. This is a nice simple api for a counting mutex which BSD/OS 4.1 uses for its BGL. I have not yet seen the new BSD/OS smp code but it seemed that using mutex_t might make it marginally easier to work with that. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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