Date: Tue, 4 Dec 2007 19:51:31 -0500 From: Bill Moran <wmoran@collaborativefusion.com> 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: <20071204195131.56cb1307.wmoran@collaborativefusion.com> In-Reply-To: <4755ED57.6030603@h3q.com> References: <4755ED57.6030603@h3q.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. Enable polling on the interface and see if that helps. See man polling. -- Bill Moran Collaborative Fusion Inc. wmoran@collaborativefusion.com Phone: 412-422-3463x4023
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