AMD64 K8 Family C1E dead apic timer fixup
ariff at FreeBSD.org
Tue Apr 24 01:40:13 UTC 2007
On Mon, 23 Apr 2007 14:46:53 -0400
John Baldwin <jhb at freebsd.org> wrote:
> On Friday 20 April 2007 07:54:44 am Ariff Abdullah wrote:
> > Will anybody object if I (or somebody else) commit this patch?
> > http://people.freebsd.org/~ariff/test/k8_c1e.diff
> > This should "fix" dead apic timer issues on latest AMD64 (Turion64
> > X2 mostly, or later revision) where C1 Enhanced (C1E) mode
> > enabled.
> > Without this, the only way to make the timer work is to disable
> > APIC or even worst, to avoid executing HLT instruction
> > (machdep.cpu_idle_hlt=0), smp or non-smp. It affect both i386 and
> > amd64.
> > See PR: i386/104678 for details.
> Does this fix all of the Turion lapic timer hangs?
Yes, and hopefully to the later revisions (if any) as well.
> Some small tweaks to the comment would be:
> - s/present/presence/
> - s/render/renders/
> - s/apic timer/local APIC timer/
> - s/dead, and/dead, so/
> - s/reading Interrupt/reading the Interrupt/
> - s/unset/clearing/
> Also, is it ok to always mask off the upper 31 bits of the MSR
> instead of preserving their current state?
It should work either way, since the upper bits are read only.
... Recording in stereo is obviously too advanced
and confusing for us idiot ***** users :P ........
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