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

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

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From: Andi Kleen

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

Date: Friday, May 25, 2007 - 1:22 am

On Fri, May 25, 2007 at 01:19:44AM -0700, William Lee Irwin III wrote:
quoted text> 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.

quoted text> 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
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Messages in current thread:

[patch] sched_clock(): cleanups, Ingo Molnar, (Fri May 25, 12:10 am)

Re: [patch] sched_clock(): cleanups, Satyam Sharma, (Fri May 25, 12:22 am)

Re: [patch] sched_clock(): cleanups, Ingo Molnar, (Fri May 25, 12:25 am)

Re: [patch] sched_clock(): cleanups, Ingo Molnar, (Fri May 25, 12:26 am)

Re: [patch] sched_clock(): cleanups, Andi Kleen, (Fri May 25, 12:31 am)

Re: [patch] sched_clock(): cleanups, Satyam Sharma, (Fri May 25, 12:35 am)

Re: [patch] sched_clock(): cleanups, Andi Kleen, (Fri May 25, 12:38 am)

Re: [patch] sched_clock(): cleanups, Peter Zijlstra, (Fri May 25, 12:39 am)

Re: [patch] sched_clock(): cleanups, Ingo Molnar, (Fri May 25, 12:39 am)

Re: [patch] sched_clock(): cleanups, Ingo Molnar, (Fri May 25, 12:43 am)

Re: [patch] sched_clock(): cleanups, Ingo Molnar, (Fri May 25, 12:49 am)

[patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 12:54 am)

Re: [patch] sched_clock(): cleanups, Andi Kleen, (Fri May 25, 12:58 am)

Re: [patch] x86_64: fix sched_clock(), Andi Kleen, (Fri May 25, 1:02 am)

Re: [patch] sched_clock(): cleanups, Ingo Molnar, (Fri May 25, 1:02 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 1:04 am)

[patch] i386, numaq: enable TSCs again, Ingo Molnar, (Fri May 25, 1:08 am)

Re: [patch] x86_64: fix sched_clock(), Peter Zijlstra, (Fri May 25, 1:15 am)

Re: [patch] sched_clock(): cleanups, Peter Zijlstra, (Fri May 25, 1:16 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 1:16 am)

Re: [patch] i386, numaq: enable TSCs again, William Lee Irwin III, (Fri May 25, 1:19 am)

Re: [patch] x86_64: fix sched_clock(), Andi Kleen, (Fri May 25, 1:20 am)

Re: [patch] sched_clock(): cleanups, Andi Kleen, (Fri May 25, 1:21 am)

Re: [patch] sched_clock(): cleanups, Peter Zijlstra, (Fri May 25, 1:22 am)

Re: [patch] i386, numaq: enable TSCs again, Andi Kleen, (Fri May 25, 1:22 am)

Re: [patch] i386, numaq: enable TSCs again, William Lee Irwin III, (Fri May 25, 1:25 am)

Re: [patch] i386, numaq: enable TSCs again, Ingo Molnar, (Fri May 25, 1:31 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 1:34 am)

Re: [patch] i386, numaq: enable TSCs again, William Lee Irwin III, (Fri May 25, 1:38 am)

Re: [patch] x86_64: fix sched_clock(), Andi Kleen, (Fri May 25, 1:41 am)

Re: [patch] i386, numaq: enable TSCs again, Ingo Molnar, (Fri May 25, 1:41 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 1:44 am)

Re: [patch] x86_64: fix sched_clock(), Andi Kleen, (Fri May 25, 1:45 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 1:55 am)

Re: [patch] x86_64: fix sched_clock(), Andrew Morton, (Fri May 25, 1:55 am)

Re: [patch] x86_64: fix sched_clock(), Andi Kleen, (Fri May 25, 2:03 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 2:19 am)

Re: [patch] x86_64: fix sched_clock(), Andi Kleen, (Fri May 25, 2:46 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 3:12 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 3:27 am)

Re: [patch] x86_64: fix sched_clock(), Andi Kleen, (Fri May 25, 4:05 am)

Re: [patch] x86_64: fix sched_clock(), Andi Kleen, (Fri May 25, 4:20 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 4:26 am)

Re: [patch] x86_64: fix sched_clock(), Ingo Molnar, (Fri May 25, 4:31 am)

[patch] sched_clock: fix preempt count imbalance, Ingo Molnar, (Fri May 25, 4:46 am)

[patch] sched_clock(): cleanups, #2, Ingo Molnar, (Fri May 25, 4:50 am)

Re: [patch] sched_clock(): cleanups, #2, Andi Kleen, (Fri May 25, 4:55 am)

Re: [patch] sched_clock(): cleanups, #2, Ingo Molnar, (Fri May 25, 5:02 am)

Re: [patch] sched_clock(): cleanups, #2, Andi Kleen, (Fri May 25, 5:15 am)

Re: [patch] sched_clock(): cleanups, #2, Andrew Morton, (Fri May 25, 9:17 am)

Re: [patch] sched_clock(): cleanups, #2, Daniel Walker, (Fri May 25, 9:26 am)

Re: [patch] sched_clock(): cleanups, #2, Andi Kleen, (Fri May 25, 9:33 am)

Re: [patch] sched_clock(): cleanups, #2, Linus Torvalds, (Fri May 25, 9:49 am)

Re: [patch] sched_clock(): cleanups, #2, Andi Kleen, (Fri May 25, 11:08 am)

Re: [patch] i386, numaq: enable TSCs again, Dave Hansen, (Fri May 25, 11:16 am)

Re: [patch] i386, numaq: enable TSCs again, john stultz, (Fri May 25, 11:23 am)

Re: [patch] sched_clock(): cleanups, #2, Ingo Molnar, (Fri May 25, 12:14 pm)

Re: [patch] sched_clock(): cleanups, #2, Linus Torvalds, (Fri May 25, 12:45 pm)

Re: [patch] x86_64: fix sched_clock(), Rusty Russell, (Sun May 27, 8:12 pm)