From: tom.barbette@ulg.ac.be
To: Konstantin Ananyev <konstantin.ananyev@intel.com>
Cc: Bruce Richardson <bruce.richardson@intel.com>,
dev@dpdk.org, helin.zhang@intel.com, jingjing.wu@intel.com
Subject: Re: [dpdk-dev] buf->hash.rss always empty with i40e
Date: Mon, 6 Feb 2017 16:07:44 +0100 (CET) [thread overview]
Message-ID: <1444803498.22738050.1486393664880.JavaMail.zimbra@ulg.ac.be> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB9772583F1114BE@irsmsx105.ger.corp.intel.com>
Hi Konstantin,
It seems a little overkill to play with the key... The XL710 seems to be able to hash on IP fields only. It seems only a configuration issue, I'm adding i40e maintainers in CC so they can confirm? I think the i40e driver should configure XL710 to hash on IP fields for TCP and UDP when only ETH_RSS_IP is given instead of hashing to 0. That would mimic ixgbe behaviour btw.
Tom
----- Mail original -----
De: "Konstantin Ananyev" <konstantin.ananyev@intel.com>
À: "tom barbette" <tom.barbette@ulg.ac.be>, "Bruce Richardson" <bruce.richardson@intel.com>
Cc: dev@dpdk.org
Envoyé: Lundi 6 Février 2017 13:25:59
Objet: RE: buf->hash.rss always empty with i40e
Hi Tom,
>
> That also leave the question of how to HASH only on the IP tuple for TCP and UDP packets? The use case is that I want all packets from the
> same IP src/dst pair to be hashed to the same queue. This cannot be enforced with a complete hash on TCP/UDP fields.
>
That's for IPv4 only?
It was a while ago, when I looked at it, but as I remember you can achieve that by filling first 64 bits of RSS hash with some meaningful values,
and keeping remaining RSS bits as zeroes.
You probably can give it a quick try with testpmd.
There is a nice article about similar subject:
http://www.ndsl.kaist.edu/~kyoungsoo/papers/TR-symRSS.pdf
Konstantin
next prev parent reply other threads:[~2017-02-06 15:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1845201442.14836426.1485600385431.JavaMail.zimbra@ulg.ac.be>
2017-01-28 10:48 ` tom.barbette
2017-01-30 10:46 ` Bruce Richardson
2017-01-30 12:59 ` tom.barbette
2017-02-06 9:25 ` tom.barbette
2017-02-06 12:25 ` Ananyev, Konstantin
2017-02-06 15:07 ` tom.barbette [this message]
2017-02-07 1:59 ` Zhang, Helin
2017-02-08 1:24 ` Wu, Jingjing
2017-02-08 14:19 ` Thomas Monjalon
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