Re: Linux-Kernel Archive: No 100 HZ timer !

[Michael Raymond <mraymond@sgi.com>]

On Fri, Apr 13, 2001 at 08:20:56AM -0400, Mark Salisbury wrote:
> inner loop, i.e. interrupt timer code should never have to convert from some
> real time value into number of decrementer ticks in order to set up the next
> interrupt as that requires devides (and 64 bit ones at that) in a tickless
> system.
> 
> this is why any variable interval list/heap/tree/whatever should be kept in
> local ticks.  frequently used values can be pre-computed at boot time to
> speed up certain calculations (like how many local ticks/proc quantum)

    What about machines without synchronized local ticks?  We're going to
have to end up doing conversions anyway because of drift and machines
without even the same speed CPUs.  A time based system using local cached
values such as cycles_per_usec would better be able to handle this.
       	       		       	     	       	    Michael

-- 
Michael A. Raymond              Office: (651) 683-3434
Irix Core Kernel Group