Re: tuning for high connection rates
- From: "Adrian Chadd" <adrian@xxxxxxxxxxx>
- Date: Wed, 5 Dec 2007 11:33:40 +0900
On 05/12/2007, Philipp Wuensche <cryx-freebsd@xxxxxxx> 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.
Kernel/System profiling will probably show you an interesting thing or
two. One thing I noticed was high in my high-TCP-transaction tests
(but not on hardware anywhere near as nice as yours!) was crypto calls
for, IIRC, syncookies.
Adrian
--
Adrian Chadd - adrian@xxxxxxxxxxx
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