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

[Ed Schouten]

Hi Jun,

* 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

-- 
 Ed Schouten <ed at 80386.nl>
 WWW: http://80386.nl/
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