Messages in this thread | | | From | Al Boldi <> | Subject | Re: [ANNOUNCE][RFC] PlugSched-6.3.1 for 2.6.16-rc5 | Date | Wed, 5 Apr 2006 11:16:08 +0300 |
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Peter Williams wrote: > Al Boldi wrote: > > Peter Williams wrote: > >> Al Boldi wrote: > >>> The default values for spa make it really easy to lock up the system. > >>> Is there a module to autotune these values according to cpu/mem/ctxt > >>> performance? > >> > >> Jake Moilanen had a genetic algorithm autotuner for Zaphod at one time > >> which I believe he ported over to PlugSched > > > > Would this be a load-adaptive dynamic tuner? > > Yes.
Wow!
> > What I meant was a lock-preventive static tuner. Something that would > > take hw-latencies into account at boot and set values for non-locking > > console operation. > > I'm not sure what you mean here. Can you elaborate?
In another thread Al Boldi wrote: > After playing w/ these tunables it occurred to me that they are really > only deadline limits, w/ a direct relation to cpu/mem/ctxt perf. > > i.e timeslice=1 on i386sx means something other than timeslice=1 on amd64 > > It follows that w/o autotuning, the static default values have to be > selected to allow for a large underlying perf range w/ a preference for > the high range. This is also the reason why 2.6 feels really crummy on > low perf ranges. > > Autotuning the default values would allow to tighten this range specific > to the hw used, thus allowing for a smoother desktop experience.
> >> I could generate a patch to gather the statistic again and make them > >> available via /proc if you would like to try a user space version of > >> Jake's work (his was in kernel). > > > > That would be great! > > OK, I'll put it on my "to do" list.
Thanks!
-- Al
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