net.inet.tcp.tso=1 still neceesary with fxp was Re: TCP differences
in 7.2 vs 7.1
Michael L. Squires
mikes at siralan.org
Wed May 20 21:55:36 UTC 2009
I started having speed problems after shifting from 7.1-STABLE to
7.1-PRERELEASE. They have continued with 7.2-STABLLE.
Reverting to the 7.1-STABLE kernel eliminated the problem.
After downloading 7.2-STABLE from cvsup.freebsd.org at about 10:40 AM EST
on 5/20/2009, doing a buildworld/buildkernel/installkernel/installworld
cycle I still need to execute "net.inet.tcp.tso=1" to elminate throughput
problems between my home system (on Comcast) and my office PC (connected
via a Time-Warner connection). This also affects connections to other
systems; downloading Web pages (ebay.com) speeds up after I change the TSO
The box in question runs NAT and has an fxp (Intel Pro100) interface connected
to a Comcast cable modem and an em (Intel Pro1000) interface connected to the
There are no network errors in "netstat -i" on either interface.
The "if_fxp.c" code appears to be the May 7 version.
This is the dmesg entry for the card in question. The system is a dual Xeon
Supermicro 1U box, 1GB RAM, single 300GB IDE hard drive.
fxp0: <Intel 82551 Pro/100 Ethernet> port 0xe400-0xe43f mem 0xfebfd000-0xfebfdfff,0xfeb80000-0xfeb9ffff irq 27 at device 7.0 on pci0
miibus0: <MII bus> on fxp0
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