ixgbe 2.1.7 can't disable LRO on 82599?

[Jack Vogel]

Correction, the 82599 is doing HW RSC, I'm sluggish after a good Indian
lunch :)


On Wed, May 12, 2010 at 1:28 PM, Jack Vogel <jfvogel at gmail.com> wrote:

> Oh, this is because the 82598 is doing HW RSC which is a different code
> path from the LRO that the 598
> does, and that may be the problem, I will need to look into that. Thanks
> for the report.
>
> And, yes, LRO is a major improvement in 10G performance, as is TSO. Are you
> sure you have no
> alternative to disabling?
>
> Cheers,
>
> Jack
>
>
>
> On Wed, May 12, 2010 at 12:03 PM, Andrew Boyer <aboyer at averesystems.com>wrote:
>
>> Hello all,
>> I'm using the 2.1.7 version of ixgbe from -CURRENT, backported to FreeBSD
>> 7.1.  With some fiddling it seems to work on both 82598 and 82599
>> controllers.
>>
>> On 82598, 'ifconfig ix0 -lro' causes dev.ix.0.counters.rxr0.lro_queued and
>> ...lro_flushed to stop incrementing, as expected.  There's also a
>> significant throughput hit which would seem to indicate that it took effect.
>>
>> However, it appears that LRO is always enabled on 82599.  'ifconfig ix0
>> -lro' removes the LRO flag from the port in ifconfig but the ...hw_lro_merge
>> counter continues to increase.  The throughput reported by the iperf port is
>> the same with or without LRO on.
>>
>> Any advice?  Am I misinterpreting something?
>>
>> Thanks,
>>  Andrew
>>
>> P.S.  We need to disable LRO because we don't have Appropriate Byte
>> Counting support and LRO causes TCP ACK havoc without it.
>>
>> --------------------------------------------------
>> Andrew Boyer    aboyer at averesystems.com
>>
>>
>>
>>
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>
>