On Tue, Nov 27, 2001 at 11:49:46AM -0500, Stefan Doehla wrote:
> Wasn't one of the goals of the whole APIC architecture reducing latencies???
No. Consider interrupt path in a SMP Intel IA32 board
assert-> I/O Apic -arbitration -> serial interrupt buss
|
processor apic
You have a gain because you are not using the Pre-Cambrian era off chip
PIC on the standard UP Intel motherboard, but you have a loss because
of the arbitration, serial bus, and 2 levels of interrupt controller.
So it's kind of a wash.
We also believe that Linux performance is declining under the weight of
all the SMP "scaling" going on in 2.2+ and think this will be an issue
in 2.5 - but 2.5 is another headache.
-- [rtl] ---
To unsubscribe:
echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
--
For more information on Real-Time Linux see:
http://www.rtlinux.org/
