netdev - Re: LRO disable warnings on kernel 2.6.38

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Date:	Mon, 21 Mar 2011 11:11:22 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <hawk@...x.dk>
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

Le lundi 21 mars 2011 à 11:04 +0100, Jesper Dangaard Brouer a écrit :
> 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
> 

Sure, this is the problem. Still your ethtool dont give us the needed
info ;)

I suspect it is :

rx-vlan-offload: off
tx-vlan-offload: on

But would like a confirmation of this ;)

# ethtool -V | head -n 1
ethtool version 2.6.37

# ethtool --version
ethtool version 2.6.37


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