|
On Thu, Nov 24, 2011 at 8:09 AM, Simon Horman <horms@xxxxxxxxxxxx> wrote:
> On Thu, Nov 24, 2011 at 11:16:10AM +1300, Roger Littin wrote:
>> Hi Wang,
>>
>> I have had similar problems where the director thinks the packet size is
>> larger than mtu of the real
>> server and sends back this message. Do you see anything in wireshark to
>> indicate this. Overly
>> large udp packet size?
>>
>> I think when the network layer hands off the packet to lvs, it may have
>> already reassembled any
>> fragments and then when lvs hands it back to the network layer, it is
>> rejected because it is too
>> large.
>
> Hi Roger,
>
> if you are seeing that problem then I suggest turning off
> both GRO and LRO on the interface on the director that receives
> the packets.
>
> e.g.
> # ethtool -k eth0 | egrep '(receive-offload)'
> generic-receive-offload: on
> large-receive-offload: on
>
> # ethtool -K eth0 lro off
> # ethtool -K eth0 gro off
>
> # ethtool -k eth0 | egrep '(receive-offload)'
> generic-receive-offload: off
> large-receive-offload: off
>
>
> IPVS may be used in conjunction with GRO since 2.6.39,
> so it should not be necessary to disable GRO if
> a 2.6.39 is used.
>
> IPVS is not compatible with LRO as of 3.1 (or 3.2, when it is released)
>
> LRO is specific to TCP.
> GRO affects both TCP and UDP (and other protocols IIRC).
>
> _______________________________________________
> Please read the documentation before posting - it's available at:
> http://www.linuxvirtualserver.org/
>
> LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
> Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
>
Hi, Simon
Since you have mentioned kernel version here, I checked about that
and I'm running 2.6.18-238.19.1.el5.centos.plus, is that a bit too
old?
Wang
_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/
LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
or go to http://lists.graemef.net/mailman/listinfo/lvs-users
|
