[dpdk-dev] Broken RSS hash computation on Intel 82574L

[Matthew Hall]

On Tue, Sep 01, 2015 at 04:37:18PM +0200, Martin Drašar wrote:
> Dne 1.9.2015 v 15:45 De Lara Guarch, Pablo napsal(a):
> > 82574L NIC uses em PMD, which does not support more than 1 queue.
> > Therefore RSS is disabled in the NIC and then you cannot have RSS hashes.
> > 
> > Thanks,
> > Pablo
> 
> Hi Pablo,
> 
> that is an interesting information. I read the rationale in em_ethdev.c
> and I was wondering, what would have to be done to enable RSS hash
> computation on that card. I can live with just one RX queue, but hashes
> would help me a lot. The computer which is using those NICs is not that
> powerful and every bit of offloaded computation counts...
> 
> Thanks,
> Martin

RSS calculations are used to direct packets across multiple RX queues. With 
only one RX queue it cannot possibly increase performance by enabling it.

Matthew.