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




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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