[dpdk-dev] [PATCH 1/3] i40e: enable extended tag

[Thomas Monjalon]

> From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com] 
> > 2015-12-21 10:38, Helin Zhang:
> > > PCIe feature of 'Extended Tag' is important for 40G performance.
> > > It adds its enabling during each port initialization, to ensure the
> > > high performance.
> > 
> > If it's so important, why the values are not documented?
> > Please start to fill a file doc/guides/nics/i40e.rst to explain how the
> > device works. Thanks
> 
> It has already been mentioned in getting started guide for a long time.
> Are you suggesting to move into i40e specifically? Thanks!

Yes you're right. I had forgotten that:
http://dpdk.org/doc/guides-2.2/linux_gsg/enable_func.html#enabling-extended-tag-and-setting-max-read-request-size

Yes, it would be better moved into an i40e doc.
And maybe max_read_request_size may be commented to give advices on values.
Thanks