tuning for high connection rates

Kris Kennaway kris at FreeBSD.org
Sun Dec 30 05:31:09 PST 2007

Philipp Wuensche wrote:
> 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.

Did you make progress on this?  I'd like to see a profiling trace from 
hwpmc, and also from LOCK_PROFILING.


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