Messages in this thread | | | Date | Mon, 15 Jul 2002 14:01:40 -0600 | From | yodaiken@fsmlabs ... | Subject | Re: HZ, preferably as small as possible |
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On Mon, Jul 15, 2002 at 03:52:37PM -0400, mbs wrote: > On Monday 15 July 2002 14:56, Linus Torvalds wrote: > > (*) Which is a lot less than the hw can generate, since you mustn't allow > > users to bog down the system in timer interrupts by just using > > "itimer(ITIMER_REAL, .. fine-resolution..)". > > actually, that is an interesting philosophical argument. > > in an embedded system, it is sometimes more useful to not put artificial
That's why we have RTLinux.
> in an embedded system a "tickless" system is sometimes preferable to a ticked > system. there is often only one or a very small number of processes/threads > running and the extra overhead of 10 surplus clock ticks per process quantum > is a waste of cycles. (also when using a ppc or similar modern chip(flame > on;-), there is no need to keep a software wall clock, as the cpu has a 64bit > free running counter)
Right: but "one or a very small number of processes/threads" does not apply to Linux.
-- --------------------------------------------------------- Victor Yodaiken Finite State Machine Labs: The RTLinux Company. www.fsmlabs.com www.rtlinux.com
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