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From: Stephen Hemminger <stephen@networkplumber.org>
To: Balakrishnan K <Balakrishnan.K1@tatacommunications.com>
Cc: "users@dpdk.org" <users@dpdk.org>
Subject: Re: Symmetric RSS Hashing support in DPDK
Date: Wed, 6 Mar 2024 07:03:59 -0800	[thread overview]
Message-ID: <20240306070359.43b8f128@hermes.local> (raw)
In-Reply-To: <PSAPR04MB5516030FB27F04F5D69DF1D7D6212@PSAPR04MB5516.apcprd04.prod.outlook.com>

On Wed, 6 Mar 2024 07:28:40 +0000
Balakrishnan K <Balakrishnan.K1@tatacommunications.com> wrote:

> Hello,
>    Our application needs symmetric hashing to handle the reverse traffic on the same core, also to
> Improve performance by distributing the traffic across core.
> Tried using rss config as below .
> action_rss_tcp.types = ETH_RSS_NONFRAG_IPV4_TCP | ETH_RSS_L3_SRC_ONLY| ETH_RSS_L3_DST_ONLY | ETH_RSS_L4_SRC_ONLY | ETH_RSS_L4_DST_ONLY;
> but could not get desired result.
> Is there any options or API available to enable symmetric RSS hashing .
> We are using dpdk 20.11 and intel NIC X710 10GbE .
> 
> Regards,
> Bala

With XL710 there are two choices:
	1. Set RSS hash function to RTE_ETH_HASH_SYMMETRIC_TOEPLITZ in
	   the rte_eth_rss_conf passed in during configure
	2. Use default (non symmetric TOEPLITZ) but pass in a rss_key that
	   has duplicated bits in the right place. Like:

0x6d5a 0x6d5a 0x6d5a 0x6d5a
0x6d5a 0x6d5a 0x6d5a 0x6d5a
0x6d5a 0x6d5a 0x6d5a 0x6d5a
0x6d5a 0x6d5a 0x6d5a 0x6d5a
0x6d5a 0x6d5a 0x6d5a 0x6d5a

	https://www.ndsl.kaist.edu/~kyoungsoo/papers/TR-symRSS.pdf

  reply	other threads:[~2024-03-06 15:04 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-06  7:28 Balakrishnan K
2024-03-06 15:03 ` Stephen Hemminger [this message]
2024-03-08  5:53   ` Balakrishnan K
2024-03-08  7:29     ` Lukáš Šišmiš
     [not found] <CDE5E416-0537-498B-BE79-D351B4051D99@cisco.com>
2024-03-31 11:47 ` Shaul Hamoi (shamoi)
2024-04-01 16:40   ` Shaul Hamoi (shamoi)

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