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Date:	Sat, 28 Apr 2007 02:51:17 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Bryan Lawver <lawver1@...l.gov>,
	"Michael S. Tsirkin" <mst@....mellanox.co.il>,
	general@...ts.openfabrics.org,
	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: [ofa-general] Re: IPoIB forwarding

On Fri, 27 Apr 2007, Rick Jones wrote:

> Bryan Lawver wrote:
> > I had so much debugging turned on that it was not the "slowing of the 
> > traffic" but the "non-coelescencing" that was the remedy.  The NIC is a 
> > MyriCom NIC and these are easy options to set.
> 
> As chance would have it, I've played with some Myricom myri10ge NICs recently, 
> and even disabled large receive offload during some netperf tests :)  It is a 
> modprobe option.  Going back now to the driver source and the README I see :-)
> 
> 
> <excerpt>
> Troubleshooting
> ===============
> 
> Large Receive Offload (LRO) is enabled by default.  This will
> interfere with forwarding TCP traffic.  If you plan to forward TCP
> traffic (using the host with the Myri10GE NIC as a router or bridge),
> you must disable LRO.  To disable LRO, load the myri10ge driver
> with myri10ge_lro set to 0:
> 
>           # modprobe myri10ge myri10ge_lro=0
> 
> Alternatively, you can disable LRO at runtime by disabling
> receive checksum offloading via ethtool:
> 
>     # ethtool -K eth2 rx off
> 
> </excerpt>
> 
> rick jones

What version of the myri10ge driver is this?  With the 1.2.0 version
that comes with the 2.6.20.7 kernel, there is no myri10ge_lro module
parameter.

[root@...g2 ~]# modinfo myri10ge | grep -i lro
[root@...g2 ~]# 

And I've been testing IP forwarding using two Myricom 10-GigE NICs
without setting any special modprobe parameters.

						-Bill
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