Re: ixgbe 2.1.7 can't disable LRO on 82599?

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@xxxxxxxxxxxxxxxx>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@xxxxxxxxxxxxxxxx




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