Date: Thu, 20 Aug 1998 06:41:53 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: sos@FreeBSD.ORG Cc: tlambert@primenet.com, croot@btp1da.phy.uni-bayreuth.de, regnauld@deepo.prosa.dk, current@FreeBSD.ORG, smp@FreeBSD.ORG Subject: Re: softupdates and smp crash Message-ID: <199808200641.XAA18028@usr02.primenet.com> In-Reply-To: <199808200629.IAA02030@sos.freebsd.dk> from "S?ren Schmidt" at Aug 20, 98 08:29:44 am
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> > > So we can still say that softupdates are broken, at least for SMP. > > > > It would be more useful (than saying this) for people to characterize > > the problem they are getting so that we can find a discriminitory > > value. I suggest: > > I suggest reading Luoqi Chen's exelent explanation as why it breaks > under SMP (hint: it has nothing todo with HW setups).. Perhaps clock speed? 8-). His post arrived in my mailbox after I responded to your post... I'm also not convinced that this is the only possible cause of the problem; the VM code is hardly "assert" protected everywhere, so diagnosing this thing is not trivial. Look at the VM fixes I recently did, which killed the bugs Karl Denniger was seeing in 75% of the cases, leaving 25% of the cases "clustered" (in his words), indicating a seperate problem, in addition to the ones I fixed, in a periodically executing code path. I had suspected that this would be the case when I made the fix, since it doesn't account for the buggy behaviour I'm personally seeing. 8-(. I myself haven't seen the problems described on my dual P90 system. I suspect the people seeing the bug Luoqi pointed to have very fast processors in order to have one "win" the race. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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