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    SubjectRe: [RFC][PATCH] iowait statistics
    On Wed, 15 May 2002, William Lee Irwin III wrote:

    > Boots compiles and runs on an 4-way physical HT box. I didn't wake
    > the evil twins to cut down on the number of variables so it stayed
    > 4-way despite the ability to go 8-way.
    >
    > Sliding window of 120 seconds, sampled every 15 seconds, under a
    > repetitive kernel compile load:
    >
    > Wed May 15 09:56:37 PDT 2002
    > cpu 60701 0 5137 203545 9327
    > cpu0 15048 0 1566 50868 2298
    > cpu1 15257 0 1176 50818 2392
    > cpu2 15248 0 1346 50802 2247
    > cpu3 15148 0 1049 51057 2390
    [... snip ...]
    > Wed May 15 09:58:22 PDT 2002
    > cpu 98583 0 8082 204779 9328
    > cpu0 24538 0 2254 51205 2298
    > cpu1 24521 0 2065 51180 2393
    > cpu2 24704 0 1978 51230 2247
    > cpu3 24820 0 1785 51164 2390
    >
    >
    > It looks very constant, not sure if it should be otherwise.

    You show-offs with your big memory and everything in it... Okay, boot that
    puppy with mem=256m and try that again, particularly with -j4 (or -j8 with
    HT on). I bet THAT will give you some IOwait!

    I think you do want to try HT after you find out the memory is small
    enough. Pure curiousity on my part, I assume it will work, although the
    results might not be what I expect.

    --
    bill davidsen <davidsen@tmr.com>
    CTO, TMR Associates, Inc
    Doing interesting things with little computers since 1979.

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