ixgbe 2.1.7 can't disable LRO on 82599?

[Jack Vogel]

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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