Date: Fri, 25 Aug 2006 17:19:21 +0300 From: Petri Helenius <pete@he.iki.fi> To: Morgan <freebsd-net@pp.dyndns.biz> Cc: freebsd-net@freebsd.org Subject: Re: Optimizing a high-latency connection Message-ID: <44EF06E9.1070003@he.iki.fi> In-Reply-To: <02df01c6c84c$dcd564c0$4345a8c0@phobos> References: <02df01c6c84c$dcd564c0$4345a8c0@phobos>
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Increase sendspace an recvspace depending which way your data is going: net.inet.tcp.sendspace: 57344 net.inet.tcp.recvspace: 256000 TCP window scaling is enabled by default nowadays if I remember correctly. Pete Morgan wrote: > Hi. > > I'm trying som file transfers across the globe. The RTT is almost 400ms and > the transfer rate is painfully slow. There are 24 router hops on the path > and I assume most of the problem is there but I wonder if there are any > sysctl variables I can trim on my side to help this problem slightly? I seem > to understand that there need to be an ACK received for at least every other > packet or at least every 100ms for the data flow to proceed uninterrupted > but I'm no expert in this field so please correct me if I'm wrong. Assuming > this IS correct, are there any sysctl variables I can optimize to change > this behaviour or will that affect low latency connections negatively. Any > other suggestions? > > Regards > Morgan > > > _______________________________________________ > 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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