Date: Mon, 05 Nov 2012 18:08:05 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Joe Holden <lists@rewt.org.uk>, Davide Italiano <davide@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Dynamic Ticks/HZ Message-ID: <5097E465.3010408@FreeBSD.org>
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Hi. Full interrupt rate on some CPU means that your system is not idle, but running some process. Another possibility is that you have DUMMYNET compiled into your kernel, which tends to schedule callout for every HZ tick, effectively blocking skipping interrupts for one of CPUs. Check 'top -SH' for running processes, or 'top -SH -m io -o vcsw' for processes doing a lot of context switches. That most likely should give an answer. -- Alexander Motin
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