kern/92023: [kernel] 'options DEVICE_POLLING' makes loadavg
bde at zeta.org.au
Sat Mar 17 16:50:11 UTC 2007
The following reply was made to PR kern/92023; it has been noted by GNATS.
From: Bruce Evans <bde at zeta.org.au>
To: Harrison Grundy <astrodog at gmail.com>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: kern/92023: [kernel] 'options DEVICE_POLLING' makes loadavg
Date: Sun, 18 Mar 2007 03:45:06 +1100 (EST)
On Sat, 17 Mar 2007, Harrison Grundy wrote:
> This would appear to be unavoidable with polling, because of what the
> load average represents. Since it only shows the number of things
> waiting to run (or, number of things on the run queue), polling would
> be expected to cause this behavior.
This behaviour (load average 2 with just 1 hog process) happens with
polling configured on no devices, and even with no devices capable of
supporting polling, but misbehaviour doesn't happen with 0 hog processes
(then the load average is 0). Why would polling be expected to do
I didn't know that polling is what causes this. It is very old
misbehaviour (happens in pre-5.2).
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