lkml.org 
[lkml]   [2007]   [Sep]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [announce] CFS-devel, performance improvements
    On 9/13/07, Ingo Molnar <mingo@elte.hu> wrote:
    >
    > * Rob Hussey <robjhussey@gmail.com> wrote:
    >
    > > Well, I was going over my config myself after you asked for me to post
    > > it, and I thought to do the same thing. Except, disabling sched_debug
    > > caused the same error as before:
    > > In file included from kernel/sched.c:794:
    > > kernel/sched_fair.c: In function 'task_new_fair':
    > > kernel/sched_fair.c:857: error: 'sysctl_sched_child_runs_first'
    > > undeclared (first use in this function)
    > > kernel/sched_fair.c:857: error: (Each undeclared identifier is
    > > reported only once
    > > kernel/sched_fair.c:857: error: for each function it appears in.)
    > > make[1]: *** [kernel/sched.o] Error 1
    > > make: *** [kernel] Error 2
    > >
    > > It only happens with sched_debug=y. I take it back, it wasn't my fault :)
    > >
    > > As for everything else, I'd be happy to.
    >
    > are you sure this is happening with the latest iteration of the patch
    > too? (with the combo-3.patch?) You can pick it up from here:
    >
    > http://people.redhat.com/mingo/cfs-scheduler/devel/sched-cfs-v2.6.23-rc6-v21-combo-3.patch
    >
    > I tried your config and it builds fine here.
    >
    > Ingo
    >

    I managed to work it all out (it was my fault after all), and I've now
    made the changes you suggested to my .configs for 2.6.23-rc1 and
    2.6.23-rc6. I've done the benchmarks all over, including tests with
    the task bound to a single core. Without further ado, the numbers I
    promised:

    lat_ctx -s 0 2
    # rc1 rc6 cfs-devel
    1 4.58 4.39 4.42
    2 4.76 4.42 4.41
    3 4.74 4.52 4.67
    4 4.74 4.44 4.76
    5 4.79 4.74 4.59
    6 4.80 4.65 4.76
    7 4.52 4.54 4.50
    8 4.72 4.57 4.62
    9 4.87 4.67 4.80
    10 4.69 4.47 4.65

    hackbench 50
    # rc1 rc6 cfs-devel
    1 6.634 5.969 5.894
    2 6.342 5.974 5.903
    3 6.219 5.913 5.941
    4 6.702 5.980 5.916
    5 6.287 6.007 5.943
    6 6.239 6.022 5.899
    7 6.434 5.946 5.904
    8 6.229 6.007 5.941
    9 6.387 5.947 5.880
    10 6.383 5.946 5.933

    pipe-test
    # rc1 rc6 cfs-devel
    1 13.39 13.16 13.20
    2 13.37 13.12 13.22
    3 13.19 13.17 13.26
    4 13.17 13.16 13.18
    5 13.16 13.22 13.23
    6 13.15 13.19 13.18
    7 13.18 13.42 13.21
    8 13.45 13.39 13.26
    9 13.40 13.40 13.28
    10 13.39 13.44 13.24

    Bound to single core:

    lat_ctx -s 0 2
    # rc1 rc6 cfs-devel
    1 3.20 2.61 2.37
    2 3.20 2.60 2.40
    3 3.21 2.67 2.38
    4 3.19 2.66 2.34
    5 3.19 2.64 2.37
    6 3.22 2.67 2.36
    7 3.21 3.29 2.36
    8 3.22 2.61 2.44
    9 3.23 2.68 2.36
    10 3.22 2.60 2.37

    hackbench 50
    # rc1 rc6 cfs-devel
    1 7.528 7.950 7.538
    2 7.649 8.026 7.548
    3 7.613 8.160 7.580
    4 7.550 8.054 7.558
    5 7.563 8.373 7.559
    6 7.617 8.152 7.550
    7 7.593 7.831 7.562
    8 7.602 8.311 7.588
    9 7.589 8.010 7.552
    10 7.682 8.059 7.556

    pipe-test
    # rc1 rc6 cfs-devel
    1 10.29 9.27 8.54
    2 10.30 9.29 8.54
    3 10.31 9.28 8.54
    4 10.29 9.27 8.54
    5 10.28 9.28 8.53
    6 10.30 9.28 8.53
    7 10.30 9.28 8.54

    I've made graphs like last time:
    http://www.healthcarelinen.com/misc/lat_ctx_benchmark.png
    http://www.healthcarelinen.com/misc/hackbench_benchmark.png
    http://www.healthcarelinen.com/misc/pipe-test_benchmark.png
    http://www.healthcarelinen.com/misc/BOUND_lat_ctx_benchmark.png
    http://www.healthcarelinen.com/misc/BOUND_hackbench_benchmark.png
    http://www.healthcarelinen.com/misc/BOUND_pipe-test_benchmark.png

    I'll also attach the graphs, as well as my .configs.

    As for the data, I really can't read much into it. I think the graphs
    tell the story better (if only I could understand the story). Overall
    though, a definite improvement over 2.6.23-rc1.
    [unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:application/x-bzip2][unhandled content-type:application/x-bzip2]
    \
     
     \ /
      Last update: 2007-09-14 03:51    [W:0.058 / U:206.676 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site