Date: Thu, 14 Apr 2005 19:39:45 -0400 (EDT) From: "Christopher T. Johnson" <cjohnson@cyberpaladin.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: i386/79943: Very High interupt rate on PCM Message-ID: <200504142339.j3ENdj1H063280@fam.cyberpaladin.com> Resent-Message-ID: <200504142340.j3ENeNr7053721@freefall.freebsd.org>
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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: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Apr 14 23:40:22 GMT 2005 >Closed-Date: >Last-Modified: >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: >Unformatted:
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