Date: Wed, 25 Jan 2012 18:37:38 -0500 (EST) From: Rick Macklem <rmacklem@uoguelph.ca> To: "Eugene M. Zheganin" <eugene@zhegan.in> Cc: freebsd-net@freebsd.org Subject: Re: low network speed Message-ID: <234323947.154683.1327534658917.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <4F1F92DE.9060200@zhegan.in>
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Eugene M. Zheganin wrote: > Hi. > > I'm suffering from low network performance on one of my FreeBSDs. > I have an i386 8.2-RELEASE machine with an fxp(4) adapter. It's > connected though a bunch of catalysts 2950 to another 8.2. While other > machines in this server room using the same sequence of switches and > the > same target source server (which, btw, is equipped with an em(4) and a > gigabit link bia catalyst 3750) show sufficient speed, this particular > machine while using scp starts with a speed of 200 Kbytes/sec and > while > copying the file shows speed about 600-800 Kbytes/sec. > > I've added this tweak to the sysctl: > > net.local.stream.recvspace=196605 > net.local.stream.sendspace=196605 > net.inet.tcp.sendspace=196605 > net.inet.tcp.recvspace=196605 > net.inet.udp.recvspace=196605 > kern.ipc.maxsockbuf=2621440 > kern.ipc.somaxconn=4096 > net.inet.tcp.sendbuf_max=524288 > net.inet.tcp.recvbuf_max=524288 > > With these settings the copying starts at 9.5 Mbytes/sec speed, but > then, as file is copying, drops down to 3.5 Megs/sec in about > two-three > minutes. > > Is there some way to maintain 9.5 Mbytes/sec (I like this speed more) > ? > You might want to try disabling the hardware checksumming via ifconfig. (I very vaguely recall doing that for a fxp(4) interface some time ago, but am probably completely wrong.:-) rick > > Thanks. > Eugene. > > P.S. This machine also runs zfs, I don't know if it's important but I > decided to mention it. > _______________________________________________ > 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"
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