Messages in this thread | | | From | Keith Owens <> | Subject | Re: NMI problems with Dell SMP Xeons | Date | Thu, 08 Jun 2006 15:11:15 +1000 |
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"Brendan Trotter" (on Wed, 7 Jun 2006 15:18:57 +0000) wrote: >Hi, > >On 6/7/06, Keith Owens <kaos@sgi.com> wrote: >> This problem is not KDB specific, although that is where it was first >> noticed. Any code that sends a broadcast IPI 2 or an NMI IPI will >> crash these Dell boxes when there is a mismatch between the cpus known >> to the BIOS and the cpus known to the OS. > >I missed this (broadcast IPI 2 causing problems)...
It turns out that there is an uncommented hack in x86_64's version of __prepare_ICR().
case NMI_VECTOR: icr |= APIC_DM_NMI; break;
That hack is not in i386, which means that IPI 2 does different things in i386 vs. x86_64 mode on the same hardware. I am still tracking down all the differences before doing a clean up patch that makes i386 and x86_64 behave the same.
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