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Date: Sun, 30 Dec 2007 14:31:07 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Philipp Wuensche <cryx-freebsd@h3q.com>
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Cc: Adrian Chadd <adrian@freebsd.org>,
	"freebsd-performance@freebsd.org" <freebsd-performance@freebsd.org>
Subject: Re: tuning for high connection rates
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Philipp Wuensche wrote:
> Adrian Chadd wrote:
>> On 05/12/2007, Philipp Wuensche <cryx-freebsd@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.

Kris