misc/142624: Sending large chunks of data fails

[Alex]

>Number:         142624
>Category:       misc
>Synopsis:       Sending large chunks of data fails
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jan 11 02:10:01 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Alex
>Release:        8.0-RELEASE
>Organization:
>Environment:
FreeBSD orion.lan 8.0-RELEASE FreeBSD 8.0-RELEASE #1: Thu Jan  7 23:11:02 EST 2010     alex at orion.lan:/usr/obj/usr/src/sys/ORION  i386
>Description:
Whenever I try to log in to Paypal or edit Wikipedia, I get no response from the web server after POSTing the form data. Additionally, when I try to email a colleague a file (Claws 3.7.3), the transfer to gmail's SMTP server stops at *exactly* 36864 bytes, every time. The file is only ~600KB.

I am using wireless on a Thinkpad X200:
44C8733I SBB THINKPAD B/G/N 44C5194I SBB INTEGRWIRELESSWIDEAREANETW
which appears to be a RTL8192SE. I am using the drivers provided by the manufacturer combined with ndis.

My MTU is set to 1500, and net.inet.tcp.tso is disabled.

This problem did not happen in 7.2-RELEASE and it does not happen with a wired connection.
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: