Date: Sat, 13 Dec 2003 00:13:27 -0600 From: Nick Buraglio <nick@buraglio.com> To: net@freebsd.org Cc: Eugene Grosbein <eugen@grosbein.pp.ru> Subject: Re: how to saturate 100Mbit Message-ID: <76FB9BF4-2D33-11D8-8DDA-000393B61F2E@buraglio.com> In-Reply-To: <3FDAAC5B.5030008@vt.edu> References: <20031213054654.GA850@grosbein.pp.ru> <3FDAAC5B.5030008@vt.edu>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 You can also use a tool like iperf to test things like this. Just a thought. nb On Dec 13, 2003, at 12:06 AM, Clark Gaylord wrote: > Eugene Grosbein wrote: >> Is it possible to saturate 100Mbit ethernet using FreeBSD 4.9-STABLE, >> Pentium-133 & Intel 430VX-based motherboard (PCI-33), >> Intel 82559 Pro/100 Ethernet (fxp) ? I tried to use sendfile(2) on >> /dev/zero but that does not work. >> Then I created 8Tb holey file and used sendfile() on it. >> That gave 100% CPU load and only 37Mbit/s on wire. > > I usually use ttcp for tcp throughput measurement. You may not be > able to do 100Mbps, due to tcp-ness, but it has a udp mode as well. > Depends on what you are interested in doing. But ttcp is pretty low > impact. Also, when you use it, boost the buffersize; this can help > performance (and lower cpu hit) considerably. > > I am doing 800+Mbps on gigE with FreeBSD 5.1 these days. The other > trick we use for link utilization with tcp is to multiplex several > sessions; we do a few score (or a few hundred :-) simultaneous ttcp's > just with a shell script and background the processes. > > ping -f with larger packets can also be useful. > > --ckg > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (Darwin) iD8DBQE/2q4LFOm2Sy5bRPQRAmO6AJ9tdPc6X8jf6lE0qRqGsjyXnQRZ/QCcDdNw hakmV6u54zdrp7XRyEaMn4M= =05mX -----END PGP SIGNATURE-----
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