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Date: Wed, 5 Apr 2006 02:33:58 +0200
From: Paolo Pisati <p.pisati@oltrelinux.com>
To: current@freebsd.org
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Cc: Luigi Rizzo <rizzo@icir.org>
Subject: Interesting data on network interrupt - part II
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Hi, 

i updated my work on interrupt profiling with sone new
experiments.

In total we have now:

-FreeBSD 4 PIC (no asm part)
-FreeBSD 7 APIC 
-FreeBSD 7 PIC
-FreeBSD 7 PREE APIC
-FreeBSD 7 APIC JHB

Some quick comments:

-PIC is much slower in masking interrupt (7k in PIC vs 3k in APIC)
-PREE let new thread save less than 500 ticks of 'queue' while 
 preempted threads are often resumed after a lot
-JHB patch shaved 2.5k ticks in interrupt masking op

For graphs, data and more comments:

http://mercurio.sm.dsi.unimi.it/~pisati/interrupt/

bye
-- 

Paolo

"le influenze esterne sono troppe, il mondo reale non e' mica 
quello fatato dei komunisti :-p" - Anonymous Lumbard