On Tue, Apr 15, 2008 at 1:46 AM, David Malone <dwmalone_at_maths.tcd.ie> 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. AMD even ship a special program / driver / hack / whatever that synchronizes the TSC on multi-core systems. The Athlon64 X2 that I have at home for games needs it for older programs to run correctly. I'm not in front of it right now, but I think it is called 'dual core cpu optimizer' or something vague like that. -- Peter Wemm - peter_at_wemm.org; peter_at_FreeBSD.org; peter_at_yahoo-inc.com "All of this is for nothing if we don't go to the stars" - JMS/B5 "If Java had true garbage collection, most programs would delete themselves upon execution." -- Robert SewellReceived on Wed Apr 16 2008 - 02:43:05 UTC
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