kern/185849: TSO in vmx driver broken

[Radim Kolar]

>Number:         185849
>Category:       kern
>Synopsis:       TSO in vmx driver broken
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jan 17 15:20:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Radim Kolar
>Release:        10.0 RC3
>Organization:
>Environment:
>Description:
vmx driver when used in windows vmware player is not sending packets when tso mode (default) is enabled on interface. because probably not all packets are tso offloaded networking seems to work if you send packets occasionally - such as ssh. packets starts to drop if you send larger file for example ftp upload.

increasing hw.vmx.txndesc did not improved situation
>How-To-Repeat:
get vmware player, install bsd into it, change network driver to vmx0, upload some file to ftp server, then look at netstat -s you will get massive amount of resent packets.
>Fix:
ifconfig vmx0 -tso

id would be good to have errata notice for this bug for 10.0

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