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

Jun Kuriyama kuriyama at FreeBSD.org
Wed Nov 11 02:39:21 UTC 2009


At Tue, 10 Nov 2009 17:03:00 +0100,
ed at 80386.nl wrote:
> > You can try with hw.clflush_disable="1" in loader.conf.  If you can
> > boot with it, I must be mistaken something (anyway its my fault).
> 
> For some reason that switch doesn't seem to have any effect.

Okay, something wrong...

> Apple MacBook3,1:
> |   Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> 
> Dell SC440:
> |   Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>

Both system has CLFUSH and SS, so CLFLUSH tweak should not executed.

Can you test with these patches?  Testing on only one of both system
is enough.  "patch-1" forces disabling CLFLUSH feature even if SS bit
exists.  "patch-2" forces no CLFLUSH tweak.  I'd like to know with
which patch your system can live.


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