Re: [ANNOUNCE][RFC] PlugSched-6.2 for 2.6.16-rc1 and2.6.16-rc1-mm1

[Paolo Ornati]

On Thu, 26 Jan 2006 12:09:53 +1100
Peter Williams <pwil3058@xxxxxxxxxxxxxx> wrote:

> I know that I've said this before but I've found the problem. 
> Embarrassingly, it was a basic book keeping error (recently introduced 
> and equivalent to getting nr_running wrong for each CPU) in the 
> gathering of the statistics that I use. :-(
> 
> The attached patch (applied on top of the PlugSched patch) should fix 
> things.  Could you test it please?

Ok, this one make a difference:

(transcode)

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5774 paolo     34   0  116m  18m 2432 R 86.2  3.7   0:11.65 transcode
 5788 paolo     32   0 51000 4472 1872 S  7.5  0.9   0:01.13 tcdecode
 5797 paolo     29   0  4948 1468  372 D  3.2  0.3   0:00.30 dd
 5781 paolo     33   0 19844 1092  880 S  1.0  0.2   0:00.10 tcdemux
 5783 paolo     31   0 47964 2496 1956 S  0.7  0.5   0:00.08 tcdecode
 5786 paolo     34   0 19840 1088  880 R  0.5  0.2   0:00.06 tcdemux

(sched_fooler)

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5804 paolo     34   0  2396  292  228 R 35.7  0.1   0:12.84 a.out
 5803 paolo     34   0  2392  288  228 R 30.5  0.1   0:11.49 a.out
 5805 paolo     34   0  2392  288  228 R 30.2  0.1   0:10.70 a.out
 5815 paolo     29   0  4948 1468  372 D  3.7  0.3   0:00.29 dd
 5458 paolo     28   0 86656  21m  15m S  0.2  4.4   0:02.18 konsole

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5804 paolo     34   0  2396  292  228 R 36.5  0.1   0:38.19 a.out
 5803 paolo     34   0  2392  288  228 R 30.5  0.1   0:34.27 a.out
 5805 paolo     34   0  2392  288  228 R 29.2  0.1   0:32.39 a.out
 5829 paolo     34   0  4952 1472  372 R  3.2  0.3   0:00.35 dd

DD_TEST + sched_fooler: 512 MB --- ~20s instead of 16.6s

This is a clear improvement... however I wonder why DD priority
fluctuate going up even to 34 (the range is something like 29 <--->
34).

-- 
	Paolo Ornati
	Linux 2.6.16-rc1-plugsched on x86_64
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