netdev - Re: LRO disable warnings on kernel 2.6.38

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Date:	Mon, 21 Mar 2011 11:04:12 +0100
From:	Jesper Dangaard Brouer <hawk@...x.dk>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Alexander Duyck <alexander.h.duyck@...el.com>,
	netdev <netdev@...r.kernel.org>,
	Neil Horman <nhorman@...driver.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Subject: Re: LRO disable warnings on kernel 2.6.38

On Mon, 2011-03-21 at 10:53 +0100, Eric Dumazet wrote:
> Couly you please send us the result of "ethtool -k eth01" to make sure
> its the problem ?

prod server:

albpd4:~# ethtool -k eth01
Offload parameters for eth01:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: on
ntuple-filters: off
receive-hashing: off

pre-prod server:

albpd1:~# ethtool -k eth01
Offload parameters for eth01:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
ntuple-filters: off
receive-hashing: off

Hmm... notice how the large-receive-offload (LRO) is different on the
two machines.

I cannot disable LRO with userspace ethtool:

albpd4:~# ethtool -K eth01 lro off
Cannot set large receive offload settings: Invalid argument

-- 
Med venlig hilsen / Best regards
  Jesper Brouer
  ComX Networks A/S
  Linux Network Kernel Developer
  Cand. Scient Datalog / MSc.CS
  Author of http://adsl-optimizer.dk
  LinkedIn: http://www.linkedin.com/in/brouer


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