[RFC] Further SMP / NUMA scheduler improvements

From: Nick Piggin (piggin_at_cyberone.com.au)
Date: 11/30/03

  • Next message: Sergey Vlasov: "Re: Disk Geometries reported incorrectly on 2.6.0-testX" 
    Date:	Sun, 30 Nov 2003 20:35:57 +1100
To: "Martin J. Bligh" <mbligh@aracnet.com>

    http://www.kerneltrap.org/~npiggin/w25/

    Been sorting some bugs out. Its pretty stable. Although CONFIG_SMT
    is still apparently broken. It will probably stay that way due to not
    having an SMP P4 to test with and being a bit busy with other things.

    I have done some tweaking of the "domains", and found some pretty
    impressive performance improvements. The 16-way NUMAQ at OSDL is
    running out of steam now (ie. I've got quite a bit of low hanging
    fruit), and I've only got a couple more days with it anyway. So I'd
    like other architectures especially to try it if interested.

    I could assist in building architecture specific scheduling descriptions
    if anyone would like to try it on a non traditional SMP / NUMA, however
    I think something might be broken with SMT handling. Probably active
    migration. I can't be bothered fixing it unless I can find an SMP P4 HT
    to test with :P

    (dbench is most significantly improved)

    System is dev16-000 at OSDL. total/idle ticks are profiler ticks.
    16GB ram, 4x4 nodes NUMAQ
    model name : Pentium III (Katmai)
    cpu MHz : 495.274
    cache size : 512 KB
     
    dbench 8 16 32 64 128
    bk19 470.84 433.47 360.04 351.96 359.86
    w22 477.35 439.82 387.77 378.65 367.07
    w25 473.10 587.74 503.35 532.83 524.61
    total/idle ticks
    bk19 3598603/124601
    w22 3425876/227225
    w25 2408853/232176
     
    tbench 8 16 24 32
    bk19 46.17 58.74 60.78 59.79
    w22 47.39 58.72 57.73 57.86
    w25 53.59 58.60 65.80 63.35
    total/idle ticks
    bk19 7603448/1115754
    w22 7808203/1897589
    w25 7150680/2038258
                                                                                    

    kernbench (make -j, 5 runs) real user sys
    bk19 82.231 997.021 152.044
    w22 81.384 973.653 140.246
    w25 80.650 970.900 131.833
    total/idle ticks
    bk19 2218739/1442831
    w22 2110820/1398357
    w25 2062930/1393573
                                                                                    

                                                                                    

    hackbench (3 runs) 1 100
    bk19 0.591 37.578
    w22 0.386 31.954
    w25 0.365 33.289
    total/idle ticks
    bk19 1948913/319060
    w22 1655610/360777
    w25 1721178/496178
                                                                                    

    reaim 256 parent time child stime child utime jpm
    bk19 247.33 373.57 3568.12 6396.64
    w22 250.37 332.70 3614.94 6318.97
    w25 258.67 311.85 3684.09 6116.21

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