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Date: Thu, 14 Apr 2005 19:39:45 -0400 (EDT)
From: "Christopher T. Johnson" <cjohnson@cyberpaladin.com>
Reply-To: "Christopher T. Johnson" <cjohnson@cyberpaladin.com>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: Very High interupt rate on PCM
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>Number:         79943
>Category:       i386
>Synopsis:       Very High interupt rate on PCM
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-i386
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Apr 14 23:40:22 GMT 2005
>Closed-Date:    Mon Jul 30 09:58:11 GMT 2007
>Last-Modified:  Mon Jul 30 09:58:11 GMT 2007
>Originator:     Christopher T. Johnson
>Release:        FreeBSD 5.3-RELEASE-p2 i386
>Organization:
>Environment:
System: FreeBSD fam.cyberpaladin.com 5.3-RELEASE-p2 FreeBSD 5.3-RELEASE-p2 #0: Mon Dec 20 16:25:48 EST 2004 root@fam.cyberpaladin.com:/usr/obj/usr/src/sys/GENERIC i386
686 CPU with HT, Alienware laptop.  NVIDIA graphics card
>Description:
When I was doing a port build from sourt I noticed that the system was very
slow.  Slower than expected.  I used systat -vmstat to verify the system
usage.  I noticed that IRQ 18 (PCM) was running at 28,000+ interupts per
second.

My most recent change was to have used portinstall to install the nvidia
drivers.

With some experements I discovered that when nvidia.ko is loaded with OUT
snd_ich.ko (and sound.ko) I have not interupt storms.  If snd_ich.ko is
loaded with OUT nvidia.ko, I get no interupt storms.  It is the combination
of the two.

On a basicly idle system, the interupts are consuming 10% of system time
and 15% of Interupt time.
>How-To-Repeat:

Load nvidia.ko and snd_ich.ko and start X windows.
>Fix:
work around: Don't load both sound and nvidia drivers at the same time.


>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->feedback 
State-Changed-By: gavin 
State-Changed-When: Sun Jun 24 21:47:19 UTC 2007 
State-Changed-Why:  

To submitter: Do you still have this problem with more recent 
versions of FreeBSD? 

http://www.freebsd.org/cgi/query-pr.cgi?pr=79943 
State-Changed-From-To: feedback->closed 
State-Changed-By: linimon 
State-Changed-When: Mon Jul 30 09:57:52 UTC 2007 
State-Changed-Why:  
Feedback timeout (> 1 month). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=79943 
>Unformatted:
