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Date: Thu, 28 Apr 2011 01:11:47 -0700
From: Julian Elischer <julian@freebsd.org>
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Cc: Alexander Best <arundel@freebsd.org>, Doug Barton <dougb@freebsd.org>,
	current@freebsd.org, Steve Wills <swills@freebsd.org>
Subject: Re: responsiveness during IO tasks
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> Doug Barton wrote:
> No problem, just let's hunt things down. I'll wait for that larger post.
> In meantime, if it is related to eventtimers, it would be good to
> collect more detailed information. You could try to make timer run
> during idle (kern.eventtimer.idletick). You could try to switch timer
> from one-shot to periodic mode (kern.eventtimer.periodic). You could
> also try to switch to another timer (kern.eventtimer.timer).

kern.eventtimer.periodic needs to be disabled to run 9.x on xen
(as of a few months ago)