svn commit: r199067 - in head/sys: amd64/amd64 i386/i386

[Jun Kuriyama]

At Mon, 9 Nov 2009 23:52:44 +0100,
ed at 80386.nl wrote:
> * Jun Kuriyama <kuriyama at FreeBSD.org> wrote:
> >   - Add hw.clflush_disable loader tunable to avoid panic (trap 9) at
> >     map_invalidate_cache_range() even if CPU is not Intel.
> >   - This tunable can be set to -1 (default), 0 and 1.  -1 is same as
> >     current behavior, which automatically disable CLFLUSH on Intel CPUs
> >     without CPUID_SS (should be occured on Xen only).  You can specify 1
> >     when this panic happened on non-Intel CPUs (such as AMD's).  Because
> >     disabling CLFLUSH may reduce performance, you can try with setting 0
> >     on Intel CPUs without SS to use CLFLUSH feature.
> >   
> >   Reviewed by:	kib
> >   Reported by:	karl, kuriyama
> >   Related to:	kern/138863
> 
> Unfortunately it seems to lock up my Intel Core 2 Duo boxes.
> 
> Systems affected:
> 
> - Apple MacBook3,1
> - Dell SC440

Thank you for your report!

(1) On MacBook, lock up occured on real hardware?  Not on hypervisor?
(2) On both system, is there no problem before this commit?


-- 
Jun Kuriyama <kuriyama at FreeBSD.org> // FreeBSD Project
         <kuriyama at s2factory.co.jp> // S2 Factory, Inc.