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From: Daniel Kan <dan@nyansa.com>
To: dev@dpdk.org
Subject: [dpdk-dev] What's the performance significance of ixgbe_recv_pkts_bulk_alloc
Date: Sun, 23 Feb 2014 15:43:17 -0800	[thread overview]
Message-ID: <71503436-5A40-4097-B1B0-8ED0B9DB6C3E@nyansa.com> (raw)

Hi,
While browsing through the ixgbe pmd code, I noticed that there is ixgbe_recv_pkts_bulk_alloc, which can be enabled if the following preconditions are met. 

     *   rxq->rx_free_thresh >= RTE_PMD_IXGBE_RX_MAX_BURST
     *   rxq->rx_free_thresh < rxq->nb_rx_desc
     *   (rxq->nb_rx_desc % rxq->rx_free_thresh) == 0
     *   rxq->nb_rx_desc<(IXGBE_MAX_RING_DESC-RTE_PMD_IXGBE_RX_MAX_BURST)

I presume the difference from the normal (non bulk) version has to do with buffer allocation. Can someone please explain the inner working of bulk_alloc and why one may or may not want to enable bulk_alloc mode? 

I only see bulk_alloc is available for ixgbe driver and not igb and e1000. Why is that?

Thanks.

Dan

             reply	other threads:[~2014-02-23 23:41 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-23 23:43 Daniel Kan [this message]
2014-02-23 23:57 ` Jayakumar, Muthurajan

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