Date: Mon, 05 Nov 2012 06:40:47 +0000 From: Joe Holden <lists@rewt.org.uk> To: Davide Italiano <davide@freebsd.org> Cc: current@freebsd.org Subject: Re: Dynamic Ticks/HZ Message-ID: <50975F6F.6010907@rewt.org.uk> In-Reply-To: <CACYV=-HwJ1j2-zDtCtuGNKzdFRJhPsZm6vtFXAVyPSabCXvFEQ@mail.gmail.com> References: <509758B8.1000409@rewt.org.uk> <CACYV=-HwJ1j2-zDtCtuGNKzdFRJhPsZm6vtFXAVyPSabCXvFEQ@mail.gmail.com>
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Davide Italiano wrote: > On Mon, Nov 5, 2012 at 7:12 AM, Joe Holden <lists@rewt.org.uk> wrote: >> Hi guys, >> >> Has some default changed between 9.1-RC2 and HEAD? >> >> On identical machines, one with 9.1-RC2 and one with HEAD from yesterday >> (GENERIC) I see the following in systat -v: >> >> 9.1: >> 65 cpu0:timer >> 10 cpu1:timer >> >> HEAD: >> 1127 cpu0:timer >> 22 cpu1:timer >> >> These are Supermicro i3 boxes and as far as I can see they have matching >> BIOS config. >> >> Thanks, >> J >> _______________________________________________ >> freebsd-current@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-current >> To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > > Which is your refresh rate for systat? > I generally measure sampling every one second (i.e. systat -vm 1). > Also, are you making your measurements when the system is idle? > In order to trace the source(s) of these interrupts you might consider > to collect data via KTR. > I'm also using a one second refresh rate, the system is entirely idle and the interupt rate is almost entirely static at 1127, occasionally it will drop to 1119. From what I understand the timer is hz/ticks which became dynamic in 9.0, although that behaviour doesn't appear to be in HEAD anymore, at least on this hardware. Thanks, J
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