Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00

From: K.R. Foley
Date: Fri Jun 17 2005 - 10:35:09 EST

Ingo Molnar wrote:
> * Ingo Molnar <mingo@xxxxxxx> wrote:
>>>There doesn't seem to be any actual lockups, just messages. I will try
>>>disabling the above when I get home this evening. Can't get to the
>>>system right now.
>>i tweaked the softlockup detector in the last patch a bit (to fix
>>false positives under very high loads), might have broken it on SMP.
> yeah - found a bug that could explain the symptoms on your system.
> Called softlockup_tick() from the global timer interrupt, instead of the
> per-CPU timer interrupt. So on SMP the other CPUs would not see any
> softlockup ticks at all, and would incorrectly report soft lockups.
> This bug is fixed in the -48-36 patch i just uploaded.
> Ingo

-48-36 has been up and running for about 45 minutes now and everything
seems much better. I held off because the soft lock ups didn't seem to
manifest themselves right away.


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