Date: Wed, 13 May 2009 09:41:31 +0900 From: Pyun YongHyeon <pyunyh@gmail.com> To: nigel@eyede.com Cc: freebsd-stable@freebsd.org, d@delphij.net Subject: Re: TCP differences in 7.2 vs 7.1 Message-ID: <20090513004131.GP65350@michelle.cdnetworks.co.kr> In-Reply-To: <4A09FDB2.5080307@eyede.com> References: <guccc2$8b4$1@ger.gmane.org> <4A09DEF1.2010202@delphij.net> <4A09FDB2.5080307@eyede.com>
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On Wed, May 13, 2009 at 10:52:34AM +1200, Nigel Wohlers wrote: > On 13/5/09 8:41 AM, Xin LI wrote: > >-----BEGIN PGP SIGNED MESSAGE----- > >Hash: SHA1 > > > >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/ > > > Thank you! This hint has saved me a lot of troubleshooting. > > I was having the same issue as David with 3 servers recently upgraded to > 7.2. Clients (MS Windows) were complaining that they were having > intermittent connectivity issues talking to these servers (https, imaps). > > They too have fxp network interface cards, no issues with other servers > upgraded to 7.2 with em cards. > Instead of disabling TSO in network stack, just disable TSO in fxp(4) as a workaround. Fix already is in RELENG_7(r191867) so you can extract the patch and apply it by hand if you want. For instance, #cd /tmp #fetch -o fxp.tso.patch "http://svn.freebsd.org/viewvc/base/head/sys/dev/fxp/if_fxp.c?r1=190982&r2=188176&view=patch" #cd /usr/src/sys/dev/fxp #patch -p4 < /tmp/fxp.tso.patch And rebuild kernel.
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