WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

[Xen-users] MTU limits?

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] MTU limits?
From: Patrick O'Rourke <porourke@xxxxxxxxxxx>
Date: Fri, 02 Sep 2005 11:58:42 -0400
Delivery-date: Fri, 02 Sep 2005 15:54:47 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla Thunderbird 1.0.6 (X11/20050716)
The network device on our hardware uses a rather large MTU (~16k), but I noticed that when setting up bridging, the MTU for the bridge and veth device is set to 1500. Trying to set the MTU on the bridge, or eth device to match that of the peth is unsuccessful:

[root@por-hv-proto3-p4 ~]# ip link set eth0 mtu 16896
SIOCSIFMTU: Invalid argument
[root@por-hv-proto3-p4 ~]#  ip link set xen-br0 mtu 16896
SIOCSIFMTU: Invalid argument

We're using xen-unstable, but a very similar issue was discussed regarding 2.0.6 on the list a while back, see:

http://lists.xensource.com/archives/html/xen-users/2005-07/msg00187.html

IIRC, the poster was suggesting that the 1500 MTU limit is in the bridge or the vif code and I was wondering if this is the case.

Thanks,

Pat

--
Patrick O'Rourke
porourke@xxxxxxxxxxx

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

<Prev in Thread] Current Thread [Next in Thread>