Re: [patch] i386, numaq: enable TSCs again

[William Lee Irwin III]

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.


-- wli
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