From: Jim Thompson <jim@netgate.com>
To: Matthew Hall <mhall@mhcomputing.net>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] Broken RSS hash computation on Intel 82574L
Date: Tue, 1 Sep 2015 10:19:23 -0500 [thread overview]
Message-ID: <8B6A7DA3-93AF-4DD2-8857-2DB548A45B8D@netgate.com> (raw)
In-Reply-To: <20150901144726.GA30421@mhcomputing.net>
> On Sep 1, 2015, at 9:47 AM, Matthew Hall <mhall@mhcomputing.net> wrote:
>
> 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.
Well, there are other things you could use that hw-provided hash for…
(but point-taken)
prev parent reply other threads:[~2015-09-01 15:19 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
2015-09-01 14:50 ` Avi Kivity
2015-09-01 15:00 ` Martin Drašar
2015-09-01 15:19 ` Jim Thompson [this message]
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