Date: Sun, 20 Jul 2014 23:42:36 +0800 From: Niu Zhixiong <kaiaixi@gmail.com> To: freebsd-net@freebsd.org Subject: A TCP problem on High Delay Message-ID: <CAOENNMCvrD91SiMfyySB1Qj7Ysvhcv1r2t-WGQV=Qb7CKe8DUA@mail.gmail.com>
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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-kern=
el-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=3D16777216
sysctl net.inet.tcp.sendbuf_max=3D16777216
sysctl net.inet.tcp.recvbuf_max=3D16777216
sysctl net.inet.tcp.sendbuf_auto=3D1
sysctl net.inet.tcp.recvbuf_auto=3D1
sysctl net.inet.tcp.sendbuf_inc=3D16384
sysctl net.inet.tcp.recvbuf_inc=3D524288
sysctl net.inet.tcp.hostcache.expire=3D1
But, Nothing is happened.
In the attachments, l_f is the linux packet capture and f_f is the freebsd
packet capture.
=E2=80=8B
packet_capture.7z
<https://docs.google.com/file/d/0By8sTL79ob4tTTBYQmhQT2Uxajg/edit?usp=3Ddri=
ve_web>
=E2=80=8B
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