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From: Masoud Moshref Javadi <masood.moshref.j@gmail.com>
To: dev@dpdk.org
Subject: [dpdk-dev] rte_eth_rx_burst only returns up to 32 packets
Date: Fri, 28 Aug 2015 12:04:12 -0700	[thread overview]
Message-ID: <55E0B0AC.7060509@gmail.com> (raw)

Hi,

The documentation of this method says: Applications implementing a 
"retrieve as much received packets as possible" policy can check this 
specific case and keep invoking the rte_eth_rx_burst() 
<http://dpdk.org/doc/api/rte__ethdev_8h.html#aee7daffe261e67355a78b106627c4c45>function 
until a value less than nb_pkts is returned.

But the function returns at most 32 packets regardless of the burst size 
parameter (nb_pkts). For example when I set the burst size to 256, it 
only returns 32 packets even though the queue has more packets. This 
means that I cannot rely on the returned value to know if there are > 
256 packets in the queue or not.

Where this number 32 comes from? Is it because "PMD: 
ixgbe_set_rx_function(): Vector rx enabled, please make sure RX burst 
size no less than 32." ?

I use DPDK 2.0.0 and Intel 82599 10 G NIC.

Thanks

             reply	other threads:[~2015-08-28 19:04 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-28 19:04 Masoud Moshref Javadi [this message]
2015-08-29  3:32 ` Gaohaifeng (A)
2015-08-29 13:55   ` Masood Moshref Javadi
2015-08-29 18:25     ` Vladislav Zolotarov

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