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From: Bill <bill@wagill.com>
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Subject: kern/5429: Ethernet collision during file transfers into FreeBSD machine.
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>Number:         5429
>Category:       kern
>Synopsis:       Ethernet collision during file transfers into FreeBSD machine.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          support
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan  8 14:30:03 PST 1998
>Last-Modified:
>Originator:     William Gill
>Organization:
>Release:        FreeBSD 2.2.5-RELEASE i386
>Environment:

	FreeBSD duchess.wagill.com 2.2.5-RELEASE
	FreeBSD 2.2.5-RELEASE #0: Tue Oct 21 14:33:00 GMT 1997
	jkh@time.cdrom.com:/usr/src/sys/compile/GENERIC  i386

	Network topology:
	- FreeBSD machine with Linksys 16-bit ISA ethernet card;
	- Windows95 machine-1 with Linksys 32-bit PCI ethernet card;
	- Linksys 8-UTP + 1-BNC port ethernet hub;
	- FreeBSD machine, Win95 machine-1, hub on coax cable;
	- Windows 95 macine-2 with Lynksys 32-bit PCI ethernet card;
	- Lantronix LPS1 print server;
	- Hub, Win95 machine-2, print server on twisted-pair cable.

>Description:

	With FreeBSD 2.1.7 transfers between Win95 machine-1 (on coax)
	and FreeBSD machine (on coax) took place at nearly 10 mbps with
	very few collisions (as displayed on hub collision light).  Once
	I upgraded to 2.2.5, when doing file trasnfers FROM Win95 machine
	TO FreeBSD machine of a very large file (ie: 20 MB), the collision
	light on the hub stays on permanently during the transfer, showing
	collisions for every data burst, and forcing a slowdown of the
	transfer rate.  In contrast, transfers FROM the FreeBSD machine TO
	the Win95 machine are collision-free, and run at nearly 10 mbps.
	Nothing in the hardware has changed between 2.1.7 and 2.2.5.

	On a possibly-related problem, if I move the Win95 machine connection
	from BNC (coax) to the hub (twisted pair), transfers FROM Win95 TO
	FreeBSD are *very* slow, peaking at about 4 mbps; transfers FROM
	FreeBSD TO Win95 are not as fast, but as high as 8 mbps.

	It seems to me that something has changed in the way FreeBSD
	handles the ethernet card, since I have not touched a thing in
	the hardware when I upgraded from FreeBSD 2.1.7 to 2.2.5.

>How-To-Repeat:

	Problem is consistently repeatable.

>Fix:
	
	You tell me.

>Audit-Trail:
>Unformatted: