tuning for high connection rates

Stanislav Sedov stas at freebsd.org
Sat Dec 8 17:19:43 PST 2007

On Wed, Dec 05, 2007 at 04:03:29PM +0100 Philipp Wuensche mentioned:
> Adrian Chadd wrote:
> > On 05/12/2007, Philipp Wuensche <cryx-freebsd at h3q.com> wrote:
> > 
> >> As I understand it, and correct me if I'm wrong, polling helps against
> >> high interrupt rates but for that intel gigabit cards have interrupt
> >> moderation. We don't have a problem with interrupts (20% CPU) at the
> >> moment but with system (100% CPU) as you can see in the system
> >> monitoring graphs. Interrupts sometimes peak at, but usually are under,
> >> the 2k interrupts/sec limit.
> > 
> > Begin by reading up on the hardware profiling support (hwpmc, pmc,
> > etc) and see if you can get some system and process-specific profiling
> > information.
> Oh interesting stuff, I definitely have to take a look into that. Nice.

You can find a good tutorial on hwpmc by Robert Watson here:

Stanislav Sedov

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