[Xen-devel] Re: Genapic testing

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26 May 2005, at 21:52, Puthiyaparambil, Aravindh wrote:

> > Are the TSCs on all CPUs suitably sync'ed up? If the PIT is firing and
> > we are updating our timestamp info often enough, and all CPUs have
> > similar TSC values, then all should work okay. Don Fry has a patch
> that
> > handles unsync'ed TSCs, if that turns out to be the problem.
> On native Linux the skew is reported and is "fixed up". But that does
> not mean the TSC was really adjusted, it will keep running with this
> gap. So the CPU TSC skew could be the problem. The only difference is
> that for Xen, the skew for the boot CPU is unusually high.
Aravindh,

I noticed yesterday that I was missing a call to enable_apic_mode() 
during local APIC initialisation. On es7000 this does some cryptic 
twiddling that I don't understand, but I suppose could arbitrarily 
break something important. :-)
I've now fixed this omission so it is probably worth trying to boot on 
es7000 and see if the timer problems have disappeared.
 -- Keir


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel