Messages in this thread | | | Date | Fri, 25 May 2007 01:25:37 -0700 | From | William Lee Irwin III <> | Subject | Re: [patch] i386, numaq: enable TSCs again |
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On Fri, May 25, 2007 at 01:19:44AM -0700, William Lee Irwin III wrote: >> 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).
On Fri, May 25, 2007 at 10:22:59AM +0200, Andi Kleen wrote: > sched_clock should handle that.
On Fri, May 25, 2007 at 01:19:44AM -0700, William Lee Irwin III wrote: >> 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.
On Fri, May 25, 2007 at 10:22:59AM +0200, Andi Kleen wrote: > You should mark_tsc_instable(), but not tsc disable. In a release or two > hopefully even that will be obsolete.
I don't have any particular preference here. I'm just donating a memory dump. I have no intention of attempting to maintain NUMA-Q support code.
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