Re: [PATCH] Minor scheduler fix to get rid of skipping in xmms

[Steven Pratt]

Andrew Morton wrote:

> Steven Pratt <slpratt@xxxxxxxxxxxxxx> wrote:
>  
>
> > For specjbb things are looking good from a throughput point of view. 
> > ...
> > Volanomark, on the other hand is still off by quite a bit from test4 stock
> >
> >    
> hmm, thanks.
>
> I'm not sure that volanomark is very representative of any real-world
> thing.
>
>  
>
> > ...
> > If thre is any particular patch/tree combination you would like me to 
> > try out, please let me know and I will see if I can get the results for 
> > you. 
> >    
>
> Could we please see test5 versus test5 plus Andrew's patch?
>
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.0-test4/2.6.0-test4-mm6/broken-out/sched-CAN_MIGRATE_TASK-fix.patch
This patch improves specjjb over test5 and has no real effect on any of 
kernbench, volanomark or specsdet.

Specjbb Throughput
          2.6.0-test5 2.6.0-test5BALANCE
 # of WHs      OPs/sec      OPs/sec    %diff         diff    tolerance
---------- ------------ ------------ -------- ------------ ------------
        1     10118.42     10062.66    -0.55       -55.76       303.55
        4     35316.38     34676.03    -1.81      -640.35      1059.49
        7     54126.17     52717.84    -2.60     -1408.33      1623.79
       10     56906.64     56587.53    -0.56      -319.11      1707.20
       13     51589.86     54625.25     5.88      3035.39      1547.70  *
       16     41410.52     43120.66     4.13      1710.14      1242.32  *
       19     32944.48     35820.89     8.73      2876.41       988.33  *

Volanomark
          2.6.0-test5 2.6.0-test5BALANCE
              Msgs/sec     Msgs/sec    %diff         diff    tolerance
---------- ------------ ------------ -------- ------------ ------------
        1        40915        41391     1.16       476.00      1227.45


> and if you have time, also test5 plus sched-CAN_MIGRATE_TASK-fix.patch plus
>
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.0-test4/2.6.0-test4-mm6/broken-out/sched-balance-fix-2.6.0-test3-mm3-A0.patch
>  
This patch degrades both specjbb and volanomark, and to a lesser degree 
specsdet

Specjbb throughput
           2.6.0-test5 2.6.0-test5MIGRATE
 # of WHs      OPs/sec      OPs/sec    %diff         diff    tolerance
---------- ------------ ------------ -------- ------------ ------------
        1     10118.42      9980.90    -1.36      -137.52       303.55
        4     35316.38     34065.11    -3.54     -1251.27      1059.49  *
        7     54126.17     52697.10    -2.64     -1429.07      1623.79
       10     56906.64     55466.77    -2.53     -1439.87      1707.20
       13     51589.86     43152.57   -16.35     -8437.29      1547.70  *
       16     41410.52     45201.21     9.15      3790.69      1242.32  *
       19     32944.48     29025.16   -11.90     -3919.32       988.33  *


Volanomark
          2.6.0-test5   2.6.0-test5MIGRATE
          Msgs/sec     Msgs/sec    %diff         diff    tolerance
---------- ------------ ------------ -------- ------------ ------------
        1        40915        38518    -5.86     -2397.00      1227.45  *


> What I'm afraid of is that those patches will yield improved results over
> test5, and that adding
>
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.0-test4/2.6.0-test4-mm6/broken-out/sched-2.6.0-test2-mm2-A3.patch
I tried adding this patch to stock test5 and it failed to apply 
cleanly.  I have not had a chance to look at why.  Did you mean for this 
to be applied by itself, or was this supposed to go on top of one of the 
other patches?

> will slow things down again.

Steve

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