Re: BFS vs. mainline scheduler benchmarks and measurements

From: Michael Buesch
Date: Tue Sep 08 2009 - 11:45:34 EST

On Monday 07 September 2009 22:57:01 Ingo Molnar wrote:
>
> * Michael Buesch <mb@xxxxxxxxx> wrote:
>
> > On Monday 07 September 2009 20:26:29 Ingo Molnar wrote:
> > > Could you profile it please? Also, what's the context-switch rate?
> >
> > As far as I can tell, the broadcom mips architecture does not have
> > profiling support. It does only have some proprietary profiling
> > registers that nobody wrote kernel support for, yet.
>
> Well, what does 'vmstat 1' show - how many context switches are
> there per second on the iperf server? In theory if it's a truly
> saturated box, there shouldnt be many - just a single iperf task
> running at 100% CPU utilization or so.
>
> (Also, if there's hrtimer support for that board then perfcounters
> could be used to profile it.)

CFS:

procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 0 15892 1684 5868 0 0 0 0 268 6 31 69 0 0
1 0 0 15892 1684 5868 0 0 0 0 266 2 34 66 0 0
1 0 0 15892 1684 5868 0 0 0 0 266 6 33 67 0 0
1 0 0 15892 1684 5868 0 0 0 0 267 4 37 63 0 0
1 0 0 15892 1684 5868 0 0 0 0 267 6 34 66 0 0
[ 4] local 192.168.1.1 port 5001 connected with 192.168.1.99 port 47278
2 0 0 15756 1684 5868 0 0 0 0 1655 68 26 74 0 0
2 0 0 15756 1684 5868 0 0 0 0 1945 88 20 80 0 0
2 0 0 15756 1684 5868 0 0 0 0 1882 85 20 80 0 0
2 0 0 15756 1684 5868 0 0 0 0 1923 86 18 82 0 0
2 0 0 15756 1684 5868 0 0 0 0 1986 87 23 77 0 0
2 0 0 15756 1684 5868 0 0 0 0 1923 87 17 83 0 0
2 0 0 15756 1684 5868 0 0 0 0 1951 84 19 81 0 0
2 0 0 15756 1684 5868 0 0 0 0 1970 87 18 82 0 0
2 0 0 15756 1684 5868 0 0 0 0 1972 85 23 77 0 0
2 0 0 15756 1684 5868 0 0 0 0 1961 87 18 82 0 0
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 28.6 MBytes 23.9 Mbits/sec
1 0 0 15752 1684 5868 0 0 0 0 599 22 22 78 0 0
1 0 0 15752 1684 5868 0 0 0 0 269 4 32 68 0 0
1 0 0 15752 1684 5868 0 0 0 0 266 4 29 71 0 0
1 0 0 15764 1684 5868 0 0 0 0 267 6 37 63 0 0
1 0 0 15764 1684 5868 0 0 0 0 267 4 31 69 0 0
1 0 0 15768 1684 5868 0 0 0 0 266 4 51 49 0 0


I'm currently unable to test BFS, because the device throws strange flash errors.
Maybe the flash is broken :(

--
Greetings, Michael.
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