Date: Tue, 04 Dec 2007 18:33:03 -0800 From: Jin Guojun <jin@george.lbl.gov> 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: <47560DDF.60909@george.lbl.gov> In-Reply-To: <20071204195131.56cb1307.wmoran@collaborativefusion.com> References: <4755ED57.6030603@h3q.com> <20071204195131.56cb1307.wmoran@collaborativefusion.com>
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Philipp Wuensche <cryx-freebsd@h3q.com> wrote: >>Hi, >> >>we are running a FreeBSD 7-BETA4 with SCHED_4BSD on a Intel Core2Dual >>E6600 2.4GHz system for our bittorrent Opentracker. >> >>The system handles about 20Kpps (18Mbit/s) incoming and 15kpps (22 >>Mbit/s) outgoing traffic serving 4000 connections/sec using TCP. The >>connections are very short-living, all answered within one packet. >> >>You can find the system stats at >>http://outpost.h3q.com/stalker/munin/opentracker/opentracker.html >> >>We are now running into some limits at peak time, system is up to 100% >>and em0 takes about 80% on one CPU while the Opentracker software only >>takes 10-15% CPU. The system is still responsible and answers all the >>requests, but we are worried what will happen if the tracker grows at >>the current rate. >> >>Currently we are out of ideas for tuning, so we kindly ask for ideas on >>tuning the system to bring down the CPU usage from the em and the system >>CPU usage. We tried tuning the em int_delay and abs_int_delay but >>without success. >> >> Is there some data for the context switch time? It may tell something. -Jin
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