Messages in this thread |  | | Date | Sat, 22 Sep 2001 13:57:16 +1000 | From | Andre Pang <> | Subject | Re: [PATCH] Preemption Latency Measurement Tool |
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On Wed, Sep 19, 2001 at 06:44:09PM -0400, Robert Love wrote:
> Available at: > http://tech9.net/rml/linux/patch-rml-2.4.9-ac12-preempt-stats-1 and > http://tech9.net/rml/linux/patch-rml-2.4.10-pre12-preempt-stats-1 > for 2.4.9-ac12 and 2.4.10-pre12, respectively.
hi Robert, thanks for producing the stats patches!
i did a test of it on linux-2.4.10-pre13 with Benno Senoner's lowlatency program, which i hacked up a bit to output /proc/latencytimes after each of the graphs. test results are at
http://www.algorithm.com.au/hacking/linux-lowlatency/2.4.10-pre13-pes/
and since i stared at the results in disbelief, i won't even try to guess what's going on :). maybe you can make some sense of it?
i'm prety sure his latencytest program runs at real-time priority, but i'll run another test just with the getrt and rt programs just posted to the list to make sure. that's the only reason i can think why the graph is so bizarre compared to the /proc/latencytimes results.
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