Date: Sun, 7 Aug 2011 17:34:27 -0400 From: "b. f." <bf1783@googlemail.com> To: Mario Lobo <lobo@bsd.com.br>, freebsd-questions@FreeBSD.org Subject: Re: High interrupt rate Message-ID: <CAGFTUwNPAJOPEzzPsd=4kdyMkQH-y6LrNkeZD11578uPY5eO0g@mail.gmail.com>
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> > I know 75% idle is not bad but this machine, when not under load on a saturday > night like today, used to be at around 98% idle 99% of the time. Now its is at > 72% idle 99.9% of the time. It has been like this all day. > > The only things with a high interrupt rate are > > cpu0: timer 46922025 2000 > cpu1: timer 46918117 1999 > > What could be causing this? I don't know that 2 timer interrupts per-cpu, per kern.hz, is altogether unexpected for some configurations, under some conditions. What happens if you boot with kern.hz="100" in /boot/loader.conf, or set via the loader command line? What happens if you remove the DEVICE_POLLING option from your kernel (and _not_ just disable polling per-device)? What is the output from "sysctl kern.timecounter kern.eventtimer"? b.
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