Re: [AD] Add timeBeginPeriod(1) to wtimer.c

[Chris <chris.kcat@xxxxxxxxxx>]

Elias Pschernig wrote:
> Not sure how high the cost would be, even in case it would work like I
> think. I only know the linux scheduler has 10ms tickss, and uses every
> 2nd tick to do scheduling (or something like that, didn't pay enough
> attention in lectures :P) - and there must be a reason they don't use
> 1ms ticks.

I believe there's a kernel option to change the frequency of the timer. 
At least, I remember seeing one in an older (pre-2.4.28) version. 2.4.28 
does, however, have a Low-latency scheduler option (which is off by 
default).. I haven't been able to test it, though.

But on my old 400MHz machine, I remember changing the timer option from 
100 to 1000, and my system became almost unuseable because it was so 
unrepsonsive. I fear the same thing is happening with 
timeBeginPeriod(1). Faster CPU's may not show as much speed defficiency 
(and perhaps at some point, it'll become more efficient), but I don't 
think current CPUs are ready for it, hence why the scheduler is still 
10ms by default.