Date: Mon, 21 Jul 2014 00:22:34 +0800 From: "bycn82" <bycn82@gmail.com> To: "'Niu Zhixiong'" <kaiaixi@gmail.com>, <freebsd-net@freebsd.org> Subject: RE: A TCP problem on High Delay Message-ID: <00d201cfa436$d2936ce0$77ba46a0$@gmail.com> In-Reply-To: <CAOENNMCvrD91SiMfyySB1Qj7Ysvhcv1r2t-WGQV=Qb7CKe8DUA@mail.gmail.com> References: <CAOENNMCvrD91SiMfyySB1Qj7Ysvhcv1r2t-WGQV=Qb7CKe8DUA@mail.gmail.com>
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Hi, Yes, according to your pcap files,it is because of the window size. more information here http://www.ietf.org/rfc/rfc1323.txt and share the result of "sysctl net.inet.tcp" Regards, bycn82 > -----Original Message----- > From: owner-freebsd-net@freebsd.org [mailto:owner-freebsd- > net@freebsd.org] On Behalf Of Niu Zhixiong > Sent: 20 July, 2014 23:43 > To: freebsd-net@freebsd.org > Subject: A TCP problem on High Delay > > Dear All, > I set up an FTP server in a high delay but fairly BW environment. > When I try to download files from this FreeBSD FTP server, A FreeBSD > client is always slower than Linux Client. (Linux Client is about 1MB/s, > But FreeBSD client 300KB/s). I am sure that the two clients are in same > networks and no firewalls are between server and clients. Then I try to > use SCTP protocol rather than TCP protocol. The FreeBSD client is faster > than itself in TCP. > > I try to increase the rbuff of the client. But, It always less than the > linux one. I think the problem may be the smaller window of Freebsd than > Linux. But, I changed some parameters. But, nothing changed. > > uname -a > 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789: Thu Jan 16 22:34:59 UTC > 2014 > root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 > > According to > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning- > kernel-limits.html > > I try to enable sysctl net.inet.tcp.inflight.enable or sysctl > net.inet.tcp.inflight_enable , but there is no such option in FreeBSD 10. > > Then I follow this https://fasterdata.es.net/host-tuning/freebsd/ > And make a large rbuffer. > > > sysctl kern.ipc.maxsockbuf=16777216 > sysctl net.inet.tcp.sendbuf_max=16777216 > sysctl net.inet.tcp.recvbuf_max=16777216 > sysctl net.inet.tcp.sendbuf_auto=1 > sysctl net.inet.tcp.recvbuf_auto=1 > sysctl net.inet.tcp.sendbuf_inc=16384 > sysctl net.inet.tcp.recvbuf_inc=524288 > sysctl net.inet.tcp.hostcache.expire=1 > > But, Nothing is happened. > > In the attachments, l_f is the linux packet capture and f_f is the > freebsd packet capture. > > > > > > packet_capture.7z > <https://docs.google.com/file/d/0By8sTL79ob4tTTBYQmhQT2Uxajg/edit?usp=dr > ive_web> > > _______________________________________________ > 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"help
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