Date: Mon, 14 Sep 2009 08:10:32 -0700 (PDT) From: Barney Cordoba <barney_cordoba@yahoo.com> To: rihad <rihad@mail.ru> Cc: freebsd-net@FreeBSD.org Subject: Re: [POLLING] strange interrupt/system load Message-ID: <409746.70532.qm@web63901.mail.re1.yahoo.com> In-Reply-To: <4AAE27B8.6050006@mail.ru>
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--- On Mon, 9/14/09, rihad <rihad@mail.ru> wrote: > From: rihad <rihad@mail.ru> > Subject: Re: [POLLING] strange interrupt/system load > To: "Barney Cordoba" <barney_cordoba@yahoo.com> > Cc: freebsd-net@FreeBSD.org > Date: Monday, September 14, 2009, 7:23 AM > Barney Cordoba wrote: > > > >> Without polling (current load around 190-200 > mbit/s, around > >> 24-26 kpps): > >> > >> top: > >> CPU: 0.0% user, 0.0% nice, 8.4% > >> system, 0.0% interrupt, 91.6% idle > >> > >> Interrupts/s: 18322 total > >> 28 mpt0 irq16 > >> 1999 cpu0: time > >> 6906 em0 irq256 > >> 3392 em1 irq257 > >> 1999 cpu1: time > >> 1999 cpu2: time > >> 1999 cpu3: time > > > > You really need to look at the taskq usage as > averaging on a 4 core > CPU: 0.0% user, 0..0% nice, 10.0% system, > 0.0% interrupt, 90.0% idle > 27 root 1 > -68 - 0K > 16K - 1 137:47 40.28% em0 taskq > 28 root 1 > -68 - 0K > 16K - 2 5:05 > 0.88% em1 taskq > > > You'll do a lot better setting your ITR to 2000 or so. > You really don't > > need an interrupt every 4 packets at those traffic > levels. > > Sorry, how would I do that? And how do I find the current > ITR value? > I made mine a sysctl long ago, so I'm not sure what the current state of em is. It used to be a macro MAX_INTS_PER_SEC Barney
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