From: Matthew Hall <mhall@mhcomputing.net>
To: "Martin Drašar" <drasar@ics.muni.cz>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] Broken RSS hash computation on Intel 82574L
Date: Tue, 1 Sep 2015 07:47:26 -0700 [thread overview]
Message-ID: <20150901144726.GA30421@mhcomputing.net> (raw)
In-Reply-To: <55E5B81E.8010601@ics.muni.cz>
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.
next prev parent reply other threads:[~2015-09-01 14:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-31 12:15 Martin Drašar
2015-09-01 13:45 ` De Lara Guarch, Pablo
2015-09-01 14:37 ` Martin Drašar
2015-09-01 14:47 ` Matthew Hall [this message]
2015-09-01 14:50 ` Avi Kivity
2015-09-01 15:00 ` Martin Drašar
2015-09-01 15:19 ` Jim Thompson
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