Re: vxlan gro problem ?

From: yinpeijun
Date: Mon Oct 13 2014 - 05:14:59 EST

On 2014/10/13 3:50, Or Gerlitz wrote:
> On 10/8/2014 10:46 AM, yinpeijun wrote:
>> Hi all,
>> recently Linux 3.14 has been released and I find the networking has added udp gro and vxlan gro funtion, then I use the redhat 7.0(there is also add this funtion)
>> to test, I use kernel vxlan module and create a vxlan device then attach the device to ovs bridge , the configure as follow:
>> root@25:~$ ip link
>> 15: vxlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue master ovs-system state UNKNOWN mode DEFAULT
>> link/ether be:e1:ae:3d:8b:f2 brd ff:ff:ff:ff:ff:ff
>> 16: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc mq master ovs-system state UNKNOWN mode DEFAULT qlen 5000
>> root@25:~$ ovs-vsctl show
>> aa1294f3-9952-4393-b2b5-54e9a6eb76ee
>> Bridge ovs-vx
>> Port ovs-vx
>> Interface ovs-vx
>> type: internal
>> Port "vnet0"
>> Interface "vnet0"
>> Port "vxlan0"
>> Interface "vxlan0"
>> ovs_version: "2.0.2"
>> vnet0 is a vm backend device, and the end is the same configuration. then I use netperf to test throughput in vm (netperf -H **** -t TCP_STREAM -l 10 -- -m 1460),
>> the result is 3-4 Gbit/sec, the improvement is not obvious, and I also confused there is no aggregation packets (length > mtu) in the end vm. so I want to know what
>> wrong ? or how to test the function ?
> As things are set in 3.14 and AFAIK also in RHEL 7.0, for GRO/VXLAN to come into play you need to run over a NIC which supports RX checksum offload too, is this the case?
> Also, the configuration you run with isn't the typical play of VXLAN with OVS... I didn't try it out and this week being out to LPC.
> Did you try the usual track of running OVS VXLAN port?e.g as explained in the Example section of [1]
> Or.
> [1]
> Or.
> .
thank you for your reply, Gerlitz .

my test environment use mellanox ConnectX-3 Pro nic , as I know the nic support Rx checksum offload. but I am not confirm if should I do some special configure?
or the nic driver or firmware need update ? also , I have used redhat7.0 ovs vxlan to test with the similar configure as before, but there is also no improvement .

the nic infomation:

04:00.0 Ethernet controller: Mellanox Technologies MT27520 Family [ConnectX-3 Pro]

root@localhost:~# ethtool -i eth4
driver: mlx4_en
version: 2.0(Dec 2011)
firmware-version: 2.31.5050
bus-info: 0000:04:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: yes

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