[PVE-User] Intel X710 10Gbit network card

Sten Aus sten.aus at eenet.ee
Thu Apr 16 13:32:59 CEST 2015

Got a little bit further

Turned on stp for this vmbr and now VM gets traffic for about 10-15 
seconds and then no packet flow again.

Note that packets are going from VM to (for example) DHCP server, but 
they will get lost on their way back. They will arrive at the eth5 and 
vmbr, but not to tap, which is connected to the VM by qemu.

Tried to upgrade Intel X710 firmware as well, no luck there. Not to 
mention the drivers small upgrade which I already did yesterday.

On 15.04.15 22:03, Sten Aus wrote:
> Thanks for the tip, but this was not the case.
> On 15.04.15 21:24, Michael Rasmussen wrote:
>> On Wed, 15 Apr 2015 21:01:35 +0300
>> Sten Aus <sten.aus at eenet.ee> wrote:
>>>> What does tcpdump disclose running on host and in VM?
>>>> On host tcpdump -i vmbr10
>>> Coworker did a lot of tcpdumps during the day and it appears the VM 
>>> tap device is not getting ARPs back. I mean this tap device what 
>>> qemu brings up/makes.
>> A long shot. Try to disable hardware checksum offload since it is know
>> to cause problems in virtualized environments.
>> You can try with ethtool before making permanent changes: ethtool -K
>> eth5 tx off
>> If that works you could add it permanently to udev:
>> Create this file: /etc/udev/rules.d/81-bridge.rules
>> With the following content:
>> ACTION=="add", SUBSYSTEM=="net", NAME=="vmbr*", RUN+="/sbin/ethtool -K
>> $env{INTERFACE} tx off"
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