Bug 31737

Summary:	Network performance is <16Kbps using a full-duplex 100mbit lan
Product:	Base System	Reporter:	dcrudy <dcrudy>
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	4.4-STABLE
Hardware:	Any
OS:	Any

Description dcrudy 2001-11-03 20:30:02 UTC

Network perfomance is non-existant while using a 100 MegaBit/sec LAN
under Full-Duplex mode.  Network stalls during ANY file transfer when
the file size exceeds around 60K including FTP and NFS.  Machines that
use other platforms, such as Microsoft Windows 98, Windows 2000, etc.,
also experiance the same problem when connecting ONLY to FreeBSD
machines, but work fine when connecting to any machine that is not
FreeBSD based.  This problem was not apparent in 4.2.

Fix: 

Uknown at this time.  Problem seems to be in the networking subsystem.
Considering that changing to half duplex fixes the problem, the problem
is probably at the interface point betwen the network subsystem and the
network interface card device driver.
How-To-Repeat: Set network transfer mode to 100mbps Full-Duplex and try to transfer
a large file which is >500KB.

Comment 1 bill fumerola freebsd_committer

2001-11-03 20:37:30 UTC

State Changed
From-To: open->closed

while "the interface point betwen[sic] the network subsystem and the 
network interface card device driver" is an intriguing place to look 
for this problem, "the speed/duplex/autoneg configruation of your switch" 
is a much more likely place to fix this. 

in any case, misconfiguration questions like these belong on 
questions@freebsd.org and not in our PR system.