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DragonFly bugs List (threaded) for 2012-01
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[DragonFlyBSD - Bug #1182] (Closed) intr 11 livelock with SMP

From: Sascha Wildner via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 19 Jan 2012 18:41:45 -0800

Issue #1182 has been updated by Sascha Wildner.

Description updated
Status changed from New to Closed
Assignee deleted (0)

Assume it is fixed with all the recent interrupt work. If it still occurs, please reopen.

Bug #1182: intr 11 livelock with SMP

Author: Michael Neumann
Status: Closed
Priority: Normal
Target version: 


UP works perfectly, SMP has this intr 11 livelock problem, which slows 
it pretty down, so that network does not work. I post output of dmesg
for both UP and SMP as well as the output of vmstat -vi. Maybe those
information are helpful to someone :). I also tried SMP with a recent
kernel (the outputs below are of a kernel which is a few month old), but 
it's even worse; it stops at "intr 7 livelocked limit engaged" during 
ATA probing.

Looking at "vmstat -vi" it's obvious that the problem is with atapci1.
Also notably is the huge difference of "irq0: clk", which is ~1600 for
UP and ~13000 for SMP. I don't know exactly what rate means here, but
if it means interrupts/second and it's the clock interrupt which usually
fires at 1000 Hz, then something is seriously wrong.



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