* [dpdk-dev] What's the performance significance of ixgbe_recv_pkts_bulk_alloc
@ 2014-02-23 23:43 Daniel Kan
2014-02-23 23:57 ` Jayakumar, Muthurajan
0 siblings, 1 reply; 2+ messages in thread
From: Daniel Kan @ 2014-02-23 23:43 UTC (permalink / raw)
To: dev
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
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [dpdk-dev] What's the performance significance of ixgbe_recv_pkts_bulk_alloc
2014-02-23 23:43 [dpdk-dev] What's the performance significance of ixgbe_recv_pkts_bulk_alloc Daniel Kan
@ 2014-02-23 23:57 ` Jayakumar, Muthurajan
0 siblings, 0 replies; 2+ messages in thread
From: Jayakumar, Muthurajan @ 2014-02-23 23:57 UTC (permalink / raw)
To: Daniel Kan, dev
If some one is interested in more of improving throughput, they will want to enable bulk_allocation.
If someone wants to have lesser latency, then they may want to go for non bulk version.
With 10 Gb, it is more critical to use bulk for achieving the desired throughput.
-----Original Message-----
From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Daniel Kan
Sent: Sunday, February 23, 2014 3:43 PM
To: dev@dpdk.org
Subject: [dpdk-dev] What's the performance significance of ixgbe_recv_pkts_bulk_alloc
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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