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Hello Satish 

Can you somehow bypass OVS ? Means install another server , just kvm +
linux bridging and made the same test ?

Regards
VM

On 17/12/15 22:31, "Satish Patel" <satish.txt at gmail.com> wrote:

>Which tunnel? I have VM running on HOST with bridge networking, its
>vnet pair. I don't have any tunnel.
>
>I increase only txqueuelen 500 to txqueuelen 10000  which improve
>networking little bit
>
>On Thu, Dec 17, 2015 at 3:26 PM, Erdősi Péter <fazy at niif.hu> wrote:
>> 2015. 12. 17. 18:07 keltezéssel, Satish Patel írta:
>>>
>>> On host (compute) machine tap device showing lots of TX packet loss.
>>>
>>> tapdd55b834-f8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>          inet6 fe80::fc16:3eff:fecd:2aa4  prefixlen 64  scopeid
>>>0x20<link>
>>>          ether fe:16:3e:cd:2a:a4  txqueuelen 500  (Ethernet)
>>>          RX packets 1060731031  bytes 298573599135 (278.0 GiB)
>>>          RX errors 0  dropped 0  overruns 0  frame 0
>>>          TX packets 503372157  bytes 81345389820 (75.7 GiB)
>>>          TX errors 0  dropped 171333348 overruns 0  carrier 0
>>>collisions
>>> 0
>>
>> Did you increased MTU properly on tunnel adapters?
>>
>> F