Messages in this thread | | | Date | Thu, 8 May 2003 17:38:25 -0700 | From | William Lee Irwin III <> | Subject | Re: how to measure scheduler latency on powerpc? realfeel doesn't work due to /dev/rtc issues |
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On Thu, May 08, 2003 at 06:12:12PM -0400, Chris Friesen wrote: >>> I'm trying to test the scheduler latency on a powerpc platform. It appears >>> that a realfeel type of program won't work since you can't program /dev/rtc >>> to generated interrupts on powerpc. Is there anything similar which could >>> be done?
On Thu, 8 May 2003, William Lee Irwin III wrote: > > Why would you want to use an interrupt? Just count jiffies in sched.c
On Thu, May 08, 2003 at 05:38:23PM -0700, Davide Libenzi wrote: > I don't know what he does mean for scheduler latency, but if it is the ctx > switch one something like get_cycles() will be better instead of jiffies.
True, if you're looking for performance tweaks and not pathologies (which I was) you'll need something that accurate.
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