Date: Fri, 13 Jul 2001 00:04:47 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: smp@freebsd.org Cc: bmilekic@freebsd.org Subject: uh oh.. bad assumption here... Message-ID: <Pine.BSF.4.21.0107130000220.61694-100000@beppo>
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I just finally looked a bit more at the MB allocation code. The assumption being made here is that: #define NCPU_PRESENT mp_ncpus Yes, this is true. What is a problem here is that it is then assumed that this CPU ids are a dense array from 0..mp_ncpus. cpuid is then used as a per-cpu index later. That this is dense can never, in fact, be true on alpha, unless we make cpuid a kernel virtual that indexes to hardware CPUid. I found this out by disabling processors 1..2 of a 4-way 4100. I crashed in inet startup as soon as CPU3 tried to do m_gethdr. Oops. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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