(Sigh) For some reason the earlier version of this message
was truncated near the end of the patch.  Lets  try again. 

This patch, in conjunction with the "core" high-res-timers
patch implements high resolution timers on the i386
platforms.  The high-res-timers use the periodic interrupt
to "remind" the system to look at the clock.  The clock
should be relatively high resolution (1 micro second or
better).  This patch allows configuring of three possible
clocks, the TSC, the ACPI pm timer, or the Programmable
interrupt timer (PIT).  Most of the changes in this patch
are in the arch/i386/time.c code.

This patch uses (if available) the APIC timer(s) to generate
1/HZ ticks and sub 1/HZ ticks as needed.  The PIT still
interrupts, but if the APIC timer is available, just causes
the wall clock update.  No attempt is made to make this
interrupt happen on jiffie boundaries, however, the APIC
timers are disciplined to expire on 1/HZ boundaries to give
consistent timer latencies WRT to the system time.

With this patch applied and enabled (at config time in the
processor feature section), the system clock will be the
specified clock.  The PIT is not used to keep track of time,
but only to remind the system to look at the clock.  Sub
jiffies are kept and available for code that knows how to
use them.

Patch is against 2.5.41-bk2
-- 
George Anzinger   george@mvista.com
High-res-timers: 
http://sourceforge.net/projects/high-res-timers/
Preemption patch:
http://www.kernel.org/pub/linux/kernel/people/rml