Date: Sat, 13 Dec 2003 01:06:19 -0500 From: Clark Gaylord <cgaylord@vt.edu> To: Eugene Grosbein <eugen@grosbein.pp.ru> Cc: net@freebsd.org Subject: Re: how to saturate 100Mbit Message-ID: <3FDAAC5B.5030008@vt.edu> In-Reply-To: <20031213054654.GA850@grosbein.pp.ru> References: <20031213054654.GA850@grosbein.pp.ru>
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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
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