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From: "Hanoch Haim (hhaim)" <hhaim@cisco.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Cc: "Hanoch Haim (hhaim)" <hhaim@cisco.com>
Subject: [dpdk-dev] mlx5 reta size is dynamic
Date: Wed, 21 Mar 2018 18:56:33 +0000	[thread overview]
Message-ID: <1b6a9384a5604f15948162766cde90a9@XCH-RTP-017.cisco.com> (raw)

Hi mlx5 driver expert,

DPDK: 17.11
Any reason mlx5 driver change the rate table size dynamically based on the rx- queues# ?
There is a hidden assumption that the user wants to distribute the packets evenly which is not always correct.

/* If the requested number of RX queues is not a power of two, use the
          * maximum indirection table size for better balancing.
          * The result is always rounded to the next power of two. */
          reta_idx_n = (1 << log2above((rxqs_n & (rxqs_n - 1)) ?
                                           priv->ind_table_max_size :
                                           rxqs_n));

thanks,
Hanoh

             reply	other threads:[~2018-03-21 18:56 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-21 18:56 Hanoch Haim (hhaim) [this message]
2018-03-21 21:47 ` Yongseok Koh
2018-03-22  6:52   ` Hanoch Haim (hhaim)
2018-03-22  8:54     ` Nélio Laranjeiro
2018-03-22  9:02       ` Hanoch Haim (hhaim)
2018-03-22  9:27         ` Nélio Laranjeiro
2018-03-22 10:00           ` Hanoch Haim (hhaim)
2018-03-22 10:45             ` Nélio Laranjeiro
2018-03-22 10:59               ` Hanoch Haim (hhaim)
2018-03-22 12:29                 ` Nélio Laranjeiro
2018-03-22 12:33                   ` Hanoch Haim (hhaim)

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