[ovirt-users] Jumbo Frames

[Phil Daws]

Ah, it looks like I need to the MTU on the underlying vnet interface therefore should be able to extend the hook to include <mtu size="9000"/>.

Have tried to add an additional property using:

CustomDeviceProperties='{type=interface;prop={extnet_ovs=^[a-zA-Z0-9_ ---]+(:[a-zA-Z0-9_ ---]+|)$};{extnet_mtu=^[a-zA-Z0-9_ ---]+(:[a-zA-Z0-9_ ---]+|)$}};'

but it fails with the following error:

Cannot set value {type=interface;prop={extnet_ovs=^[a-zA-Z0-9_ ---]+(:[a-zA-Z0-9_ ---]+|)$};{extnet_mtu=^[a-zA-Z0-9_ ---]+(:[a-zA-Z0-9_ ---]+|)$}}; to key CustomDeviceProperties. Invalid syntax, custom device properties specification should conform to \{type=(disk|interface|video|sound|controller|balloon|channel|redir|console|rng|smartcard|watchdog);prop=\{((([a-z_A-Z0-9])+)=(([^;])*)(;(([a-z_A-Z0-9])+)=(([^;])*))*;?)?\}\}[;]?

I did try:

CustomDeviceProperties='{type=interface;prop={extnet_ovs=^[a-zA-Z0-9_ ---]+(:[a-zA-Z0-9_ ---]+|)$};prop={extnet_mtu=^[a-zA-Z0-9_ ---]+(:[a-zA-Z0-9_ ---]+|)$}};'

but that just gave me a new property of 'prop' :)

Any help appreciated please.

Thanks, Phil

----- Original Message -----
From: "Phil Daws" <uxbod at splatnix.net>
To: "Dan Yasny" <dyasny at gmail.com>
Cc: "users" <users at ovirt.org>
Sent: Friday, 21 November, 2014 8:49:51 AM
Subject: Re: [ovirt-users] Jumbo Frames

Hello Dan:

We are using OVS for SFlow and OSPF functionality.  You can see that the bridge was correctly set:

ovirtmgmt: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000

Very odd as OVS is unaware of whether its jumbo frames or not.

Thanks, Phil

----- Original Message ----- 
From: "Dan Yasny" <dyasny at gmail.com> 
To: "Phil Daws" <uxbod at splatnix.net> 
Cc: "users" <users at ovirt.org> 
Sent: Friday, 21 November, 2014 1:39:32 AM 
Subject: Re: [ovirt-users] Jumbo Frames 

Why do you use OVS at all? If you have VLANs, all you need is to tag the mgmt traffic, and create a VM traffic VLAN with a different MTU. The bridge and underlying NICs will have MTU=9000 and the VM bridge will have MTU=1500 

On Thu, Nov 20, 2014 at 7:40 PM, Phil Daws < uxbod at splatnix.net > wrote: 


Hello: 

am really enjoying oVirt but have now hit an issue with iSCSI. As there is only one NIC in the host I have had to enable an MTU of 9000 on ovirtmgmt. Then have vNIC profiles on that interface which are using a custom hook for Openvswitch. I have created a specific vLAN for iSCSI traffic and on the initiator and targets have set their respective interface MTUs to be 9000. When I connect to a LUN it is timing out straight away with a 1011 error. If I drop the MTU back to 1500 all works okay. This is all fine on my other KVM, non-oVirt, system so am wondering if I have missed a step ? 

Thanks, Phil 
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