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    SubjectRe: [patch] cache-miss and cache-refs events on P6-mobile CPUs
    On Tue, Aug 11, 2009 at 11:34:05AM +0200, Ingo Molnar wrote:
    >
    > Could you try the patch below, does it do the trick? Note, since
    > there's just two generic counters and perf stat uses four counters,
    > you'll need to run longer commands than 'true' or something like:
    >
    > perf stat -a sleep 1
    >
    > or:
    >
    > perf stat --repeat 10 /bin/ls -R /usr/bin >/dev/null
    >
    > to get all counters excercised and time-shared on your CPU.

    OK, here are the results:

    # ./perf stat -a true

    Performance counter stats for 'true':

    1.332145 task-clock-msecs # 1.057 CPUs
    4 context-switches # 0.003 M/sec
    0 CPU-migrations # 0.000 M/sec
    121 page-faults # 0.091 M/sec
    788333 cycles # 591.777 M/sec
    610408 instructions # 0.774 IPC
    <not counted> cache-references
    <not counted> cache-misses

    0.001260775 seconds time elapsed

    # ./perf stat -a sleep 1

    Performance counter stats for 'sleep 1':

    1001.358010 task-clock-msecs # 1.000 CPUs
    253 context-switches # 0.000 M/sec
    0 CPU-migrations # 0.000 M/sec
    145 page-faults # 0.000 M/sec
    8841883 cycles # 8.830 M/sec (scaled from 85.04%)
    6361047 instructions # 0.719 IPC (scaled from 78.03%)
    801847 cache-references # 0.801 M/sec (scaled from 14.96%)
    16925 cache-misses # 0.017 M/sec (scaled from 21.97%)

    1.001540692 seconds time elapsed

    # ./perf stat --repeat 10 /bin/ls -R /usr/bin >/dev/null

    Performance counter stats for '/bin/ls -R /usr/bin' (10 runs):

    8.642859 task-clock-msecs # 0.939 CPUs ( +- 2.382% )
    1 context-switches # 0.000 M/sec ( +- 0.000% )
    0 CPU-migrations # 0.000 M/sec ( +- 0.000% )
    375 page-faults # 0.043 M/sec ( +- 0.000% )
    14796621 cycles # 1712.005 M/sec ( +- 0.306% )
    15526008 instructions # 1.049 IPC ( +- 0.020% )
    <not counted> cache-references
    <not counted> cache-misses

    0.009207932 seconds time elapsed ( +- 4.020% )

    # ./perf stat --repeat 10 /bin/ls -lR /usr/bin >/dev/null

    Performance counter stats for '/bin/ls -lR /usr/bin' (10 runs):

    49.894190 task-clock-msecs # 0.762 CPUs ( +- 8.231% )
    45 context-switches # 0.001 M/sec ( +- 52.174% )
    0 CPU-migrations # 0.000 M/sec ( +- 0.000% )
    476 page-faults # 0.010 M/sec ( +- 0.000% )
    81036819 cycles # 1624.173 M/sec ( +- 3.166% ) (scaled from 96.03%)
    88822455 instructions # 1.096 IPC ( +- 2.108% ) (scaled from 96.42%)
    573228 cache-references # 11.489 M/sec ( +- 37.947% )
    <not counted> cache-misses

    0.065464625 seconds time elapsed ( +- 19.349% )

    # ./perf stat --repeat 10 /bin/ls -R /usr/lib >/dev/null

    Performance counter stats for '/bin/ls -R /usr/lib' (10 runs):

    136.771643 task-clock-msecs # 0.075 CPUs ( +- 19.292% )
    757 context-switches # 0.006 M/sec ( +- 56.332% )
    0 CPU-migrations # 0.000 M/sec ( +- 0.000% )
    343 page-faults # 0.003 M/sec ( +- 0.000% )
    173125500 cycles # 1265.800 M/sec ( +- 5.034% ) (scaled from 78.21%)
    174597635 instructions # 1.009 IPC ( +- 1.829% ) (scaled from 78.34%)
    2441413 cache-references # 17.850 M/sec ( +- 18.289% ) (scaled from 21.79%)
    21112 cache-misses # 0.154 M/sec ( +- 11.183% ) (scaled from 21.66%)

    1.824204481 seconds time elapsed ( +- 29.781% )


    Johannes


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