Messages in this thread | | | Date | Sat, 19 Sep 2009 22:22:22 +0200 | From | Ingo Molnar <> | Subject | Re: BFS vs. mainline scheduler benchmarks and measurements |
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* Felix Fietkau <nbd@openwrt.org> wrote:
> Ingo Molnar wrote: > > * Felix Fietkau <nbd@openwrt.org> wrote: > >> I did some tests with BFS v230 vs CFS on Linux 2.6.30 on a different > >> MIPS device (Atheros AR2317) with 180 MHz and 16 MB RAM. When running > >> iperf tests, I consistently get the following results when running the > >> transfer from the device to my laptop: > >> > >> CFS: [ 5] 0.0-60.0 sec 107 MBytes 15.0 Mbits/sec > >> BFS: [ 5] 0.0-60.0 sec 119 MBytes 16.6 Mbits/sec > >> > >> The transfer speed from my laptop to the device are the same with BFS > >> and CFS. I repeated the tests a few times just to be sure, and I will > >> check vmstat later. > > > > Which exact mainline kernel have you tried? For anything performance > > related running latest upstream -git (currently at 202c467) would be > > recommended. > > I used the OpenWrt-patched 2.6.30. Support for the hardware that I > tested with hasn't been merged upstream yet. Do you think that the > scheduler related changes after 2.6.30 are relevant for non-SMP > performance as well? If so, I'll work on a test with latest upstream > -git with the necessary patches when I have time for it.
Dont know - it's hard to tell what happens without basic analysis tools. Is there _any_ way to profile what happens on that system? (Do hrtimers work on it that could be used to profile it?)
Ingo
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