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    SubjectRe: [tbench regression fixes]: digging out smelly deadmen.
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    On Sat, 2008-10-11 at 16:39 +0200, Peter Zijlstra wrote:

    > That said, we can probably still avoid the division for the top level
    > stuff, because the sum of the top level weights is still invariant
    > between all tasks.

    Less math would be nice of course...

    > I'll have a stab at doing so... I initially didn't do this because my
    > first try gave some real ugly code, but we'll see - these numbers are a
    > very convincing reason to try again.

    ...but the numbers I get on Q6600 don't pin the tail on the math donkey.

    Update to UP test log.

    2.6.27-final-up
    ring-test - 1.193 us/cycle = 838 KHz (gcc-4.3)
    tbench - 337.377 MB/sec tso/gso on
    tbench - 340.362 MB/sec tso/gso off
    netperf - 120751.30 rr/s tso/gso on
    netperf - 121293.48 rr/s tso/gso off

    2.6.27-final-up
    patches/revert_weight_and_asym_stuff.diff
    ring-test - 1.133 us/cycle = 882 KHz (gcc-4.3)
    tbench - 340.481 MB/sec tso/gso on
    tbench - 343.472 MB/sec tso/gso off
    netperf - 119486.14 rr/s tso/gso on
    netperf - 121035.56 rr/s tso/gso off

    2.6.28-up
    ring-test - 1.149 us/cycle = 870 KHz (gcc-4.3)
    tbench - 343.681 MB/sec tso/gso off
    netperf - 122812.54 rr/s tso/gso off

    My SMP log, updated to account for TSO/GSO monkey-wrench.

    (<bleep> truckload of time <bleep> wasted chasing unbisectable
    <bleepity-bleep> tso gizmo. <bleep!>)

    SMP config, same as UP kernels tested, except SMP.

    tbench -t 60 4 localhost followed by four 60 sec netperf
    TCP_RR pairs, each pair on it's own core of my Q6600.

    2.6.22.19

    Throughput 1250.73 MB/sec 4 procs 1.00

    16384 87380 1 1 60.01 111272.55 1.00
    16384 87380 1 1 60.00 104689.58
    16384 87380 1 1 60.00 110733.05
    16384 87380 1 1 60.00 110748.88

    2.6.22.19-cfs-v24.1

    Throughput 1213.21 MB/sec 4 procs .970

    16384 87380 1 1 60.01 108569.27 .992
    16384 87380 1 1 60.01 108541.04
    16384 87380 1 1 60.00 108579.63
    16384 87380 1 1 60.01 108519.09

    2.6.23.17

    Throughput 1200.46 MB/sec 4 procs .959

    16384 87380 1 1 60.01 95987.66 .866
    16384 87380 1 1 60.01 92819.98
    16384 87380 1 1 60.01 95454.00
    16384 87380 1 1 60.01 94834.84

    2.6.23.17-cfs-v24.1

    Throughput 1238.68 MB/sec 4 procs .990

    16384 87380 1 1 60.01 105871.52 .969
    16384 87380 1 1 60.01 105813.11
    16384 87380 1 1 60.01 106106.31
    16384 87380 1 1 60.01 106310.20

    2.6.24.7

    Throughput 1204 MB/sec 4 procs .962

    16384 87380 1 1 60.00 99599.27 .910
    16384 87380 1 1 60.00 99439.95
    16384 87380 1 1 60.00 99556.38
    16384 87380 1 1 60.00 99500.45

    2.6.25.17

    Throughput 1223.16 MB/sec 4 procs .977
    16384 87380 1 1 60.00 101768.95 .930
    16384 87380 1 1 60.00 101888.46
    16384 87380 1 1 60.01 101608.21
    16384 87380 1 1 60.01 101833.05

    2.6.26.5

    Throughput 1183.47 MB/sec 4 procs .945

    16384 87380 1 1 60.00 100837.12 .922
    16384 87380 1 1 60.00 101230.12
    16384 87380 1 1 60.00 100868.45
    16384 87380 1 1 60.00 100491.41

    numbers above here are gcc-4.1, below gcc-4.3

    2.6.26.6

    Throughput 1177.18 MB/sec 4 procs

    16384 87380 1 1 60.00 100896.10
    16384 87380 1 1 60.00 100028.16
    16384 87380 1 1 60.00 101729.44
    16384 87380 1 1 60.01 100341.26

    TSO/GSO off

    2.6.27-final

    Throughput 1177.39 MB/sec 4 procs

    16384 87380 1 1 60.00 98830.65
    16384 87380 1 1 60.00 98722.47
    16384 87380 1 1 60.00 98565.17
    16384 87380 1 1 60.00 98633.03

    2.6.27-final
    patches/revert_weight_and_asym_stuff.diff

    Throughput 1167.67 MB/sec 4 procs

    16384 87380 1 1 60.00 97003.05
    16384 87380 1 1 60.00 96758.42
    16384 87380 1 1 60.00 96432.01
    16384 87380 1 1 60.00 97060.98

    2.6.28.git

    Throughput 1173.14 MB/sec 4 procs

    16384 87380 1 1 60.00 98449.33
    16384 87380 1 1 60.00 98484.92
    16384 87380 1 1 60.00 98657.98
    16384 87380 1 1 60.00 98467.39





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