>>> On Thu, 2011-10-13 at 19:57 -0700, Tom Eastep wrote:
>>>> On Oct 13, 2011, at 7:27 PM, Tom Eastep wrote:
>>>> > On Oct 13, 2011, at 7:18 PM, Tom Eastep wrote:
>>>> >> On Oct 13, 2011, at 1:22 PM, Simon Matter wrote:
>>>> >>>
>>>> >>> Tom, did you test with complex TC or simple TC?
>>>> >>> I've just tested adding burst on one of the existing EL4 systems
>>>> and
>>>> it
>>>> >>> indeed increases the download speed to almost full speed. However,
>>>> the
>>>> >>> same config on the EL6 box just doesn't work at all even with the
>>>> latest
>>>> >>> official RHEL6.1 kernel.
>>>> >>
>>>> >> I tested using Simple TC.
>>>> >>
>>>> > As far as I know, IN-BANDWIDTH handling is identical in Internal and
>>>> Simple.
>>>> >
>>>> I just configured my Centos6 box with complex TC and it worked just
>>>> the
>>>> same.
>>>>
>>>
>>> Grasping at straws, here is the Tc.pm that I'm releasing in 4.4.25 Beta
>>> 2. While my testing shows that it makes IN-BANDWIDTH enforcement more
>>> accurate, I am not hopeful that it will help your issue.
>>
>> Thanks Tom, I appreciate your help!
>> I have tried the whole thing as you did with KVM - and of course it
>> worked
>> as it did for you.
>> Finally, before giving up, I went to the box, put in a simple USB
>> ethenet
>> adapter, and voilĂ  - it works perfec :)
>> That means to me it must be some of the offloading stuff. I tried the
>> settings from the shorewall FAQ but without success, so I have to check
>> again, I either did something wrong in the tests or my adapter needs
>> other
>> settings. I'll come back with more infos.
>
> Finally, disabling generic-receive-offload fixes the whole mess :)
>
> Tom, maybe you could update the FAQ like this:
>
> - ethtool -k ethN tso off gso off
> + ethtool -K ethN tso off gso off gro off
>
> (Note the -K instead -k as well)
>
> Of maybe even like this to be sure:
>
> ethtool -K ethN tso off ufo off gso off gro off

Please forget this one   ^^^^^^^^^, udp-fragmentation-offload can not be
disabled at least on my systems, is is off by default for me.

Simon


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