kern/92023: kernel 'options DEVICE_POLLING' makes loadavg wrong

Joerg Lehners Joerg.Lehners at Informatik.Uni-Oldenburg.DE
Thu Jan 19 13:30:06 PST 2006


>Number:         92023
>Category:       kern
>Synopsis:       kernel 'options DEVICE_POLLING' makes loadavg wrong
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan 19 21:30:04 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Joerg Lehners
>Release:        FreeBSD 6.0-STABLE i386
>Organization:
ARBI, Dept. Informatik, Fk II, University of Oldenburg
>Environment:
FreeBSD testido2 6.0-STABLE FreeBSD 6.0-STABLE #2: Thu Jan 19 22:05:47 MET 2006     root at testido2:/usr/src/sys/i386/compile/JL-TESTIDO2  i386

	Joe Avgs i386 PC with 6.0-STABLE as of 12. January 2006

>Description:

	Add the line
		options        DEVICE_POLLING
	to the kernel config file, compile and boot this kernel,
	start one program like 'main () { while (1) { } }' on the otherwise
	idle machine and watch the load avg. climbing above 1 and eventually
	reaching 2.
	For the counter test remove the options DEVICE_POLLING line
	and watch the load avg. reaching 1 for the same test.

>How-To-Repeat:
	
	See above

>Fix:

	Don't know, I'm no kernel hacker yet.


>Release-Note:
>Audit-Trail:
>Unformatted:


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