Re: Faster timers for Linux 2.1.22 (patch included)

Ingo Molnar (
Mon, 27 Jan 1997 15:04:57 +0100 (MET)

On Mon, 27 Jan 1997, Finn Arne Gangstad wrote:

> Ok, I fixed this and added some speed to add_timer and cascade_timers
> as well. timer.h can now be used as it is in the normal linux
> distribution, the only changes are in kernel/sched.c. The code can now
> be used both in 2.0.28 and 2.1.23 (and most other versions I guess).
> Remove the functions add_timer(), del_timer() and run_timer_list() and
> the definitions just before add_timer() from sched.c (they are a
> contiguous block) and replace it by this block:

could 'cascade_timers()' be fixed somehow, to avoid the unpredictable
length cli()-ed loop?

currently cascade_timers() adds unlimited number of timers via
add_timer(). Thats ... ~ 1 millisec cli/sti delay for 1000 timers, ~ 1
second cli/sti delay for 1 million timers. [say when a network link fails
temporarily, all timers count down to zero]

-- mingo