[PVE-User] Intel X710 10Gbit network card

[Sten Aus]

Forgot to mention that with newer drivers (1.2.37 (stock) and 1.2.38 
(new from Intel support page)) I had a situation where I turned on STP 
on my vmbr10 Linux bridge, VM had connectivity for about 10-20 seconds 
and then it all failed again.

On 16.04.15 23:16, Sten Aus wrote:
> I dont want to shout before the night, but it seems that the link is 
> working!
>
> I have downgraded drivers to
>> driver: i40e
>> version: 1.1.23
> As my coworker set up a new environment with Ubuntu and run different 
> kvm's there and it worked, I saw that there was a difference between 
> driver versions. Ubuntu was using
>> driver: i40e
>> version: 0.3.36-k 
> So, somehow I thought that why not try to downgrade.
>
> On 16.04.15 14:32, Sten Aus wrote:
>> 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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>>
>>
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>
>
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