Messages in this thread | | | Date | Wed, 11 Aug 2004 09:31:49 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] voluntary-preempt-2.6.8-rc3-O5 |
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* Lee Revell <rlrevell@joe-job.com> wrote:
> (jackd/12427): 10882us non-preemptible critical section violated 400 > us preempt threshold starting at kernel_fpu_begin+0x10/0x60 and ending > at fast_clear_page+0x75/0xa0
to make sure this is a real latency and not some rdtsc weirdness, could you try the latest version of preempt-timing:
http://redhat.com/~mingo/voluntary-preempt/preempt-timing-on-2.6.8-rc3-O5-A2
this adds jiffies-based latency values to the printout, e.g.:
(ksoftirqd/0/2): 3860us [3 jiffy] non-preemptible critical section violated 100 us preempt threshold starting at ___do_softirq+0x1b/0x90 and ending at cond_resched_softirq+0x57/0x70
shows that a 10 jiffy (10 msec) latency happened - which matches the rdtsc-based 3860 usecs value.
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