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Date: Mon, 15 Aug 2005 08:57:15 -0700 (PDT)
From: Nick Johnson <freebsd@spatula.net>
Reply-To: Nick Johnson <freebsd@spatula.net>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: fire_saver.ko causes high CPU usage by swi5 
X-Send-Pr-Version: 3.113
X-GNATS-Notify:

>Number:         84957
>Category:       kern
>Synopsis:       fire_saver.ko causes high CPU usage by swi5
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Aug 15 16:00:28 GMT 2005
>Closed-Date:    Thu May 03 15:19:19 GMT 2007
>Last-Modified:  Thu May 03 15:19:19 GMT 2007
>Originator:     Nick Johnson
>Release:        FreeBSD 5.4-STABLE i386
>Organization:
morons.org 
>Environment:
System: FreeBSD turing.morons.org 5.4-STABLE FreeBSD 5.4-STABLE #2: Mon Aug 15 08:31:15 PDT 2005     root@turing.morons.org:/usr/src/sys/i386/compile/TURING  i386

	
>Description:

I noticed, surprisingly high user CPU usage (circa 35%) when the machine was completely idle.  top -S showed
that all of that 35% was going to swi5: clock sio.  This was also driving the system load at idle up to 0.40 

After mucking about with various kernel configuration options I noticed that after rebooting the usage of swi5
was reasonable for several minutes and then jumped up to 35%.  It was then that I thought of checking to see if 
I had configured a screen saver to load, and sure enough, I had fire_saver.ko loaded.

Unloading fire_saver.ko sent the usage of swi5 back down to 0%.  I suspect somewhere in fire_saver.ko one might
find ugliness.

	
>How-To-Repeat:
Load fire_saver.ko.  Wait for it to start.  top -S
	
>Fix:

kldunload fire_saver.ko
	


>Release-Note:
>Audit-Trail:

From: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk>
To: bug-followup@FreeBSD.org, freebsd@spatula.net
Cc:  
Subject: Re: kern/84957: fire_saver.ko causes high CPU usage by swi5
Date: Thu, 03 May 2007 15:59:16 +0100

 This looks like it has been fixed with the patch in PR kern/100683, and
 has been MFC'd to 6-STABLE a couple of months ago.  It will appear in
 6.3-RELEASE.
 
 Are you able to take the machine in question to 6-STABLE and confirm
 that this is no longer a problem?
 
 Thanks,
 
 Gavin

From: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk>
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: kern/84957: fire_saver.ko causes high CPU usage by swi5
Date: Thu, 03 May 2007 16:07:24 +0100

 Mail to submitter bounces.  I'm pretty sure the problem was fixed in
 kern/100683.  This PR should be closed.
State-Changed-From-To: open->closed 
State-Changed-By: maxim 
State-Changed-When: Thu May 3 15:18:56 UTC 2007 
State-Changed-Why:  
Should be fixed now. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=84957 
>Unformatted:
