Date: Tue, 12 May 2009 17:31:01 -0400 From: David Samms <dsamms@nw-ds.com> To: freebsd-stable@freebsd.org Subject: Re: TCP differences in 7.2 vs 7.1 Message-ID: <4A09EA95.7050800@nw-ds.com> In-Reply-To: <4A09DEF1.2010202@delphij.net> References: <guccc2$8b4$1@ger.gmane.org> <4A09DEF1.2010202@delphij.net>
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Xin LI wrote: > Hi David, > > David Samms wrote: >> After upgrading to 7.2 (amd64) some customers complained of very poor >> bandwidth. Upon investigation all the effected customers were ATT DSL >> clients located all over the USA, not in a single city, nor were other >> ISPs effected. The server is a Supermicro with dual (quad core) >> processors with a single Intel fxp network card on a 100mbit connection. > > Could you please try if this would help: > > sysctl net.inet.tcp.tso=0 > > Cheers, > - -- > Xin LI <delphij@delphij.net> http://www.delphij.net/ > FreeBSD - The Power to Serve! Xin LI, Thank you for your help. Setting sysctl net.inet.tcp.tso=0 resolved the issue completely. What does sysctl net.inet.tcp.tso=0 do? Where can I read more about the option? I captured tcpdumps of a single file transfer to 7.1, 7.2 and 7.2 with sysctl net.inet.tcp.tso=0, but they are to large to attach to this list. Let me know if you are interested in viewing the dump files. Thanks again for your assistance!
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