Date: Wed, 5 Dec 2007 11:33:40 +0900 From: "Adrian Chadd" <adrian@freebsd.org> To: "Philipp Wuensche" <cryx-freebsd@h3q.com> Cc: "freebsd-performance@freebsd.org" <freebsd-performance@freebsd.org> Subject: Re: tuning for high connection rates Message-ID: <d763ac660712041833m259e35f4kaf1d8aedade22760@mail.gmail.com> In-Reply-To: <4755FAD8.5030805@h3q.com> References: <4755ED57.6030603@h3q.com> <20071204195131.56cb1307.wmoran@collaborativefusion.com> <4755FAD8.5030805@h3q.com>
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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. 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@freebsd.org
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