misc/161528: tftpd[86572]: Timeout #3 on ACK 2

[Shamrock]

>Number:         161528
>Category:       misc
>Synopsis:       tftpd[86572]: Timeout #3 on ACK 2
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Oct 12 23:10:06 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Shamrock
>Release:        8.2 RELEASE
>Organization:
>Environment:
FreeBSD dhcp-test.aster.pl 8.2-RELEASE-p3 FreeBSD 8.2-RELEASE-p3 #0: Tue Sep 27 18:45:57 UTC 2011     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
I've got timeouts on tftpd connection when Cisco connects with tftpd on FreeBSD with em driver:

Oct 13 00:55:57 tftpd tftpd[11319]: Timeout #0 on ACK 1
Oct 13 00:56:02 tftpd tftpd[11319]: Timeout #1 on ACK 1
Oct 13 00:56:07 tftpd tftpd[11319]: Timeout #2 on ACK 1

Neither new kernel nor "ifconfig -rxcsum -txcsum" help.
On FreeBSD 7.x it worked all right.

>How-To-Repeat:
Run tftpd on FreeBSD 8.2 box with em network and connect with Cisco.
>Fix:


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