Am Mittwoch, 29. Juni 2005 11:15 schrieb William Weston:
> On Wed, 29 Jun 2005, Ingo Molnar wrote:
> 
> > > [...] but i think i'm going to revert that, it's causing too many 
> > > problems all around.
> > 
> > reverted it and this enabled the removal of the extra ->disable() you 
> > noticed - this should further speed up the IOAPIC code. These changes 
> > are in the -50-34 kernel i just uploaded.
> 
> -50-34 fixed the wakeup latency regression I was seeing on my Athlon box
> with -50-33, and seems a bit more responsive than -50-25.  Max wakeup
> latency is back down to 14us (from 39us), even while running JACK (xrun
> free) and two instances of burnK7.  Overall system response is probably
> the best I've seen with the RT kernels ;-}
> 
attached patch for io_apic.c lets
1. gcc 3.4.3 optimize io_apic access a little better.
2. CONFIG_X86_UP_IOAPIC_FAST work here.
   Didn't check, if it really speeds up things.

Karsten