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    SubjectRe: 2.6.23.1-rt9 (and others)
    >>> On Wed, Nov 7, 2007 at 10:41 AM, in message
    <Pine.LNX.4.58.0711071040210.8572@gandalf.stny.rr.com>, Steven Rostedt
    <rostedt@goodmis.org> wrote:

    >
    > So please compare -rt7, -rt8 and -rt10.

    Here are my results from running:

    sudo chrt -f 80 ./cyclictest -n -p 90 -t 8 -d 100 -i 100

    with

    while true; do make mrproper; make allmodconfig; make -j 128 > /dev/null; done
    on a plain kernel.org kernel

    running in the background on an 8-way (4core x2) C2D Xeon 5335 system

    23.1-rt7
    ---------------------------

    144.60 135.30 116.38 30/814 8184

    T: 0 ( 5990) P:90 I:100 C:11560415 Min:2 Act: 5 Avg: 4 Max: 83
    T: 1 ( 5991) P:89 I:200 C:5780208 Min: 2 Act: 5 Avg: 4 Max: 66
    T: 2 ( 5992) P:88 I:300 C:3853472 Min: 2 Act: 5 Avg: 5 Max: 89
    T: 3 ( 5993) P:87 I:400 C:2890104 Min: 2 Act: 6 Avg: 5 Max: 70
    T: 4 ( 5994) P:86 I:500 C:2312083 Min: 2 Act: 4 Avg: 5 Max: 91
    T: 5 ( 5995) P:85 I:600 C:1926736 Min: 2 Act: 5 Avg: 5 Max: 94
    T: 6 ( 5996) P:84 I:700 C:1651488 Min: 2 Act: 12 Avg: 5 Max: 115
    T: 7 ( 5997) P:83 I:800 C:1445052 Min: 2 Act: 6 Avg: 5 Max: 79

    23.1-rt8
    ---------------------------
    119.95 106.56 107.98 37/811 18445

    T: 0 ( 5052) P:90 I:100 C:29592746 Min: 2 Act: 21 Avg: 4 Max: 78
    T: 1 ( 5053) P:89 I:200 C:14796374 Min: 2 Act: 6 Avg: 4 Max: 81
    T: 2 ( 5054) P:88 I:300 C:9864249 Min: 2 Act: 10 Avg: 4 Max: 88
    T: 3 ( 5055) P:87 I:400 C:7398187 Min: 2 Act: 6 Avg: 4 Max: 86
    T: 4 ( 5056) P:86 I:500 C:5918550 Min: 2 Act: 13 Avg: 9 Max: 69
    T: 5 ( 5057) P:85 I:600 C:4932125 Min: 2 Act: 11 Avg: 4 Max: 71
    T: 6 ( 5058) P:84 I:700 C:4227536 Min: 2 Act: 8 Avg: 5 Max: 65
    T: 7 ( 5059) P:83 I:800 C:3699094 Min: 2 Act: 4 Avg: 4 Max: 114

    23.1-rt10
    ---------------------------
    143.39 123.49 117.92 22/791 5802

    T: 0 ( 5305) P:90 I:100 C:45332860 Min: 2 Act: 4 Avg: 4 Max: 89
    T: 1 ( 5306) P:89 I:200 C:22666431 Min: 2 Act: 3 Avg: 5 Max: 49
    T: 2 ( 5307) P:88 I:300 C:15110954 Min: 2 Act: 6 Avg: 5 Max: 76
    T: 3 ( 5308) P:87 I:400 C:11333216 Min: 2 Act: 7 Avg: 5 Max: 81
    T: 4 ( 5309) P:86 I:500 C:9066572 Min: 2 Act: 8 Avg: 5 Max: 57
    T: 5 ( 5310) P:85 I:600 C:7555477 Min: 2 Act: 8 Avg: 5 Max: 55
    T: 6 ( 5311) P:84 I:700 C:6476123 Min: 2 Act: 14 Avg: 6 Max: 73
    T: 7 ( 5312) P:83 I:800 C:5666608 Min: 2 Act: 5 Avg: 6 Max: 78

    note that the rt10 image was running for a much longer duration than the other two...which generally will push the max higher. I know in general if I let -rt7 go that long it will hit 120-150+. This means these tests were biased towards -rt7 and -rt8 performing better, but they still came in with higher latencies.

    I will officially test -rt11 next, tho in my small runs so far it looks great.

    HTH

    Regards,
    -Greg

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