lkml.org 
[lkml]   [2004]   [Aug]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch] voluntary-preempt-2.6.8-rc3-O5

* 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.

Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:05    [W:0.366 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site