On Tue, Apr 15, 2008 at 09:46:02AM +0100, David Malone wrote: > On Mon, Apr 14, 2008 at 09:51:42PM -1000, Jeff Roberson wrote: > > I think we should confirm whether this is the case with earlier opterson. > > I have seen two processors on the same die out of sync. > > This can definitely happen according to this note from AMD, which > someone posted a link to earlier in the thread: > > http://lkml.org/lkml/2005/11/4/173 > > it can happen when you hlt one core, but don't hlt the other on > some processors. Actually that is something slightly different. Even without HLT, RDTSC on the two cores of a dual-core processor can be out of sync. HLT can affect the delta between the two cores. -- -- David (obrien_at_FreeBSD.org)Received on Thu Apr 17 2008 - 22:35:33 UTC
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