kern/68013: tp->snd_wl1 & snd_wl2 are not updated in the header prediction cases

[Mike Cambria]

>Number:         68013
>Category:       kern
>Synopsis:       tp->snd_wl1 & snd_wl2 are not updated in the header prediction cases
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jun 16 15:30:24 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Mike Cambria
>Release:        4.8 stable
>Organization:
>Environment:
FreeBSD mcambria.fid4.com 4.8-STABLE FreeBSD 4.8-STABLE #0: Fri Dec 26 16:24:22 EST 2003     root at mcambria:/usr/obj/usr/src/sys/OPTI11  i386      
>Description:
In tcp_input.c, if we process enough data in the header prediction code -- where the step 6 never executes, and then somehow reach step 6.  snd_wnd collapses and tcp_output stops sending.  



>How-To-Repeat:
Transfer a very large file that stays in "steady state" so as to execute header prediction for a 2+ GB transfer.  Then cause header prediction to exit (e.g. pull the cable on the receiving node briefly.)
>Fix:
I believe that snd_wl1 & snd_wl2 need to be updated in the header prediction cases as well.
>Release-Note:
>Audit-Trail:
>Unformatted: