Date: Mon, 23 Dec 1996 22:21:49 -0800 From: Erich Boleyn <erich@uruk.org> To: smp@freebsd.org Cc: haertel@ichips.intel.com, wscott@ichips.intel.com Subject: I think we have the culprit!! (was -> Re: Eureka (maybe...) (was -> Re: P6 problem idea ) ) Message-ID: <E0vcQFJ-0003Y6-00@uruk.org> In-Reply-To: Your message of "Mon, 23 Dec 1996 19:32:52 PST." <E0vcNbo-0003EK-00@uruk.org>
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Erich Boleyn <erich@uruk.org> writes: > I tried shutting off the page global stuff, and while I don't have > a difinitively long run yet, it has run through 3 full kernel compiles > with no crash yet. I'll run it for the next 1 1/2 hours and see if > it lives through that. If so, I think we have our main culprit (I'll > also post the (small) code change which synchronizes the CPUs on TLB > shootdown before letting the sender continue). Well, after 2 hours of kernel builds, and now a few sets of 4 parallel kernel builds later, the system is still running great. I think we have our culprit... the Page Global stuff (plus adding the TLB shootdown synchronization may be helping a little with stability, but it's absence doesn't appear to be the major cause). > All that said, I'm very surprised that this *isn't* also a serious > problem on the Pentium (the Pentium has the Page Global stuff as > well... I didn't look to see if it is used for the Pentium as well > as the Pentium Pro). I might be confused here, but as mentioned in the above comment, I thought this was implemented in the Pentium as well. Can someone who remembers better (or has the "Appendix H" equivalent released documentation) comment? -- Erich Stefan Boleyn \_ E-mail (preferred): <erich@uruk.org> Mad Genius wanna-be, CyberMuffin \__ (finger me for other stats) Web: http://www.uruk.org/~erich/ Motto: "I'll live forever or die trying"
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