lkml.org 
[lkml]   [2003]   [May]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: how to measure scheduler latency on powerpc? realfeel doesn't work due to /dev/rtc issues
    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.


    -- wli
    -
    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 13:35    [W:2.867 / U:0.040 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site