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Date: Tue, 2 Jun 2009 14:46:50 GMT
From: "Mr. Olli" <mister.olli@googlemail.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: Xen domU outgoing data transfer stall when TSO is enabled
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>Number:         135178
>Category:       kern
>Synopsis:       [xen] Xen domU outgoing data transfer stall when TSO is enabled
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-xen
>State:          feedback
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jun 02 14:50:02 UTC 2009
>Closed-Date:    
>Last-Modified:  Sun Nov 28 15:20:13 UTC 2010
>Originator:     Mr. Olli
>Release:        8-CURRENT r193225
>Organization:
>Environment:
FreeBSD template-8_CURRENT.domain 8.0-CURRENT FreeBSD 8.0-CURRENT #1 r193225: Mon Jun  1 17:18:52 CEST 2009     root@template-8_CURRENT.domain:/usr/obj/usr/src/sys/XEN  i386
>Description:
Transfering files larger than some size (presumably 2MB) via SSH with FreeBSD XEN para-virt domU stall after transfering 2112kb of data, when domU is source of transfer.

SSH transfers with the domU as target work properly.


>How-To-Repeat:
1) Enable TSO for xn0
2) transfer data (e.g. kernel file)

template-8_CURRENT# ifconfig xn0 tso
template-8_CURRENT# scp /boot/kernel/kernel dante@10.30.1.15:/tmp
Password: 
kernel                                                                                                  46% 2112KB   1.4MB/s - stalled -^CKilled by signal 2.
template-8_CURRENT# 

>Fix:
As reported by "Anne Marcel Roorda" on freebsd-xen disable TCP Segmentation offloading solves the problem.

template-8_CURRENT# ifconfig xn0 -tso
template-8_CURRENT# scp /boot/kernel/kernel dante@10.30.1.15:/tmp
kernel                                          100% 4510KB   4.4MB/s   00:00    
template-8_CURRENT# 




>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-xen 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Tue Jun 2 17:36:18 UTC 2009 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=135178 
State-Changed-From-To: open->feedback 
State-Changed-By: cperciva 
State-Changed-When: Sun Nov 28 15:17:27 UTC 2010 
State-Changed-Why:  
Bug is probably fixed, place into state feedback in case the submitter 
can still reproduce. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=135178 

From: Colin Percival <cperciva@freebsd.org>
To: bug-followup@FreeBSD.org, mister.olli@googlemail.com
Cc:  
Subject: Re: kern/135178: [xen] Xen domU outgoing data transfer stall when
 TSO is enabled
Date: Sun, 28 Nov 2010 07:17:25 -0800

 This bug should have been fixed by SVN r208901 in June 2010 (merged to stable/8
 as r209061).  Are you still seeing this with a recent tree?
 
 -- 
 Colin Percival
 Security Officer, FreeBSD | freebsd.org | The power to serve
 Founder / author, Tarsnap | tarsnap.com | Online backups for the truly paranoid
>Unformatted:
