From: Perugu Hemasai Chandra Prasad <hemasaiperugu@5g.iith.ac.in>
To: "Wang, Haiyue" <haiyue.wang@intel.com>
Cc: "users@dpdk.org" <users@dpdk.org>, "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-users] [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding.
Date: Tue, 3 Sep 2019 14:53:31 +0530 [thread overview]
Message-ID: <CALJSgO6g1sNO4G1vRPC5Y_YL7_4m8eZ0Vnam_gNBRNm8gq1ycA@mail.gmail.com> (raw)
In-Reply-To: <E3B9F2FDCB65864C82CD632F23D8AB8773D655F0@shsmsx102.ccr.corp.intel.com>
Hi,
I tried changing "RTE_I40E_DESCS_PER_LOOP" located in i40e_rxtx.h to 1 and
recompiling DPDK but it didn't work. Is there any procedure to make it work
for rx_burst of 1 packet?
On Tue, 3 Sep, 2019, 12:32 Wang, Haiyue, <haiyue.wang@intel.com> wrote:
> Some PMD Vector Rx for performance has an hidden limitation like :
>
> /* nb_pkts shall be less equal than RTE_I40E_MAX_RX_BURST */
> nb_pkts = RTE_MIN(nb_pkts, RTE_I40E_MAX_RX_BURST);
>
> /* nb_pkts has to be floor-aligned to RTE_I40E_DESCS_PER_LOOP */
> nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_I40E_DESCS_PER_LOOP);
> <------ ;-)
>
> #define RTE_I40E_DESCS_PER_LOOP 4
>
> BR,
> Haiyue
>
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Perugu Hemasai
> Chandra Prasad
> > Sent: Tuesday, September 3, 2019 13:00
> > To: users@dpdk.org; dev@dpdk.org
> > Subject: [dpdk-dev] unable to receive packets less than 4 with
> rte_eth_rx_burst Api -regarding.
> >
> > Hi All,
> > I am trying to receive packets transmitted by another DPDK
> > application running on different system. I am able to transmit packets
> with
> > a burst value of 1 using rte_eth_tx_burst Api, but unable to receive
> > packets with a burst value less than 4 using rte_eth_rx_burst Api. can
> > anyone please tell me the reason behind that? Is that because of any
> EthDev
> > configuration?. How to receive packets with a burst value of 1?
> >
> > Thanks & Regards,
> > Hemasai
>
next prev parent reply other threads:[~2019-09-03 9:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-03 5:00 [dpdk-users] " Perugu Hemasai Chandra Prasad
2019-09-03 7:02 ` [dpdk-users] [dpdk-dev] " Wang, Haiyue
2019-09-03 9:23 ` Perugu Hemasai Chandra Prasad [this message]
2019-09-03 9:47 ` Perugu Hemasai Chandra Prasad
2019-09-03 11:33 ` Wang, Haiyue
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