Messages in this thread | | | From | Con Kolivas <> | Subject | Re: [PATCH] sched: staircase deadline misc fixes | Date | Thu, 29 Mar 2007 09:44:45 +1000 |
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On Thursday 29 March 2007 04:48, Ingo Molnar wrote: > hm, how about the questions Mike raised (there were a couple of cases of > friction between 'the design as documented and announced' and 'the code > as implemented')? As far as i saw they were still largely unanswered - > but let me know if they are all answered and addressed:
I spent less time emailing and more time coding. I have been working on addressing whatever people brought up.
> http://marc.info/?l=linux-kernel&m=117465220309006&w=2
Attended to.
> http://marc.info/?l=linux-kernel&m=117489673929124&w=2
Attended to.
> http://marc.info/?l=linux-kernel&m=117489831930240&w=2
Checked fine.
> and the numbers he posted: > > http://marc.info/?l=linux-kernel&m=117448900626028&w=2
Attended to.
> his test conclusion was that under CPU load, RSDL (SD) generally does > not hold up to mainline's interactivity.
There have been improvements since the earlier iterations but it's still a fairness based design. Mike's "sticking point" test case should be improved as well.
My call based on my own testing and feedback from users is:
Under niced loads it is 99% in favour of SD.
Under light loads it is 95% in favour of SD.
Under Heavy loads it becomes proportionately in favour of mainline. The crossover is somewhere around a load of 4.
If the reluctance to renice X goes away I'd say it was 99% across the board and to much higher loads.
> Ingo
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