Date: Mon, 05 Nov 2012 16:35:19 +0000 From: Joe Holden <lists@rewt.org.uk> To: Alexander Motin <mav@FreeBSD.org> Cc: Davide Italiano <davide@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Dynamic Ticks/HZ Message-ID: <5097EAC7.1080200@rewt.org.uk> In-Reply-To: <5097E465.3010408@FreeBSD.org> References: <5097E465.3010408@FreeBSD.org>
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Alexander Motin wrote: > 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. > Hi, It looks like the device polling is what was causing it, once I'd removed that from kernconf it returned to normal - full interupt rate is ok though if I can increase the rate to a decent level
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