[Xen-devel] Re: HPET/PIT timer accuracy

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29 Jul 2005, at 18:53, Ian Pratt wrote:

> > Any ideas what could be going on?! This is something of a
> > pain for the new time code, which syncs the local TSCs to the
> > chipset timer....
> These systems haven't got a 'spread spectrum'[*] PCI bus clock per
> chance? It might be worth seeing if there's a BIOS option for it.
I did check one of our machines, and spread spectrum was definitely 
disabled. In any case, I'd expect that to jitter the clock at some high 
frequency, but not add/remove ticks in a way that would be discernable 
at 1Hz.
 -- Keir


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