On Sun, Nov 10 2002, Con Kolivas wrote:
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> >On Sat, Nov 09 2002, Con Kolivas wrote:
> >> >You're showing a big shift in behaviour between 2.4.19 and 2.4.20-rc1.
> >> >Maybe it doesn't translate to worsened interactivity. Needs more
> >> >testing and anaysis.
> >> Sounds fair enough. My resources are exhausted though. Someone else have
> >> any thoughts?
> >Try setting lower elevator passover values. Something ala
> ># elvtune -r 64 /dev/hda
> >(or whatever your drive is)
> Heres some more data:
> Kernel [runs] Time CPU% Loads LCPU% Ratio
> 2.4.20-rc1  1142.2 6 90 10 16.00
> 2420rc1r64  575.0 12 43 10 8.05
> That's it then. Should I run a family of different values and if so
> over what range?
The default is 2048. How long does the io_load test take, or rather how
many tests are appropriate to do? To get a good picture of how it looks
you should probably try: 0, 8, 16, 64, 128, 512. Once you get some of
these results, it will be easier to determine which area(s) would be
most interesting to further explore.
There's also the write passover, I don't think it will have much impact
on this test though.
-- Jens Axboe
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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:17 EST