On Fri, May 25, 2007 at 01:19:44AM -0700, William Lee Irwin III wrote: > On Fri, May 25, 2007 at 10:08:27AM +0200, Ingo Molnar wrote: > > Andi, Andrew, do you remember why we disabled TSCs on NUMAQ? It was > > slightly async between CPUs, right? In that case we should try the patch > > below. > > I remember. It was far beyond "slightly async;" they would drift > minutes apart during reasonable amounts of uptime, though it would take > at least several days to drift so far (I don't recall how long it took).
sched_clock should handle that. > TSC synchronization is uniformly impossible on NUMA-Q. Bootlogs showing > the results of the attempts are still extant. They shouldn't end up too > far apart right after booting, but I don't have even ballpark estimates. > I'd hazard a guess of a few seconds. You should mark_tsc_instable(), but not tsc disable. In a release or two hopefully even that will be obsolete. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
