* [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding.
@ 2019-09-03 5:00 Perugu Hemasai Chandra Prasad
2019-09-03 7:02 ` Wang, Haiyue
0 siblings, 1 reply; 5+ messages in thread
From: Perugu Hemasai Chandra Prasad @ 2019-09-03 5:00 UTC (permalink / raw)
To: users, dev
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
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding. 2019-09-03 5:00 [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding Perugu Hemasai Chandra Prasad @ 2019-09-03 7:02 ` Wang, Haiyue 2019-09-03 9:23 ` Perugu Hemasai Chandra Prasad 0 siblings, 1 reply; 5+ messages in thread From: Wang, Haiyue @ 2019-09-03 7:02 UTC (permalink / raw) To: Perugu Hemasai Chandra Prasad, users, dev 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 ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding. 2019-09-03 7:02 ` Wang, Haiyue @ 2019-09-03 9:23 ` Perugu Hemasai Chandra Prasad 2019-09-03 9:47 ` Perugu Hemasai Chandra Prasad 0 siblings, 1 reply; 5+ messages in thread From: Perugu Hemasai Chandra Prasad @ 2019-09-03 9:23 UTC (permalink / raw) To: Wang, Haiyue; +Cc: users, dev 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 > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding. 2019-09-03 9:23 ` Perugu Hemasai Chandra Prasad @ 2019-09-03 9:47 ` Perugu Hemasai Chandra Prasad 2019-09-03 11:33 ` Wang, Haiyue 0 siblings, 1 reply; 5+ messages in thread From: Perugu Hemasai Chandra Prasad @ 2019-09-03 9:47 UTC (permalink / raw) To: Wang, Haiyue; +Cc: users, dev Hi Haiyue, It is working ,thanks for your response. can you please tell what kind of performance limitation we have if RTE_I40E_DESCS_PER_LOOP value is less than 4 ? Thanks & Regards, Hemasai On Tue, Sep 3, 2019 at 2:53 PM Perugu Hemasai Chandra Prasad < hemasaiperugu@5g.iith.ac.in> wrote: > 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 >> > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding. 2019-09-03 9:47 ` Perugu Hemasai Chandra Prasad @ 2019-09-03 11:33 ` Wang, Haiyue 0 siblings, 0 replies; 5+ messages in thread From: Wang, Haiyue @ 2019-09-03 11:33 UTC (permalink / raw) To: Perugu Hemasai Chandra Prasad; +Cc: users, dev Hi Hemasai You can see the comments in code like " /* A.1 load 4 pkts desc */ ", it use vector instruction to handle HW desc *in batch*. And also, you can change it to non-vector function by adjust some parameters, please refer to i40e_set_rx_function for detail, it has debug message for your reference. BR, Haiyue From: Perugu Hemasai Chandra Prasad [mailto:hemasaiperugu@5g.iith.ac.in] Sent: Tuesday, September 3, 2019 17:48 To: Wang, Haiyue <haiyue.wang@intel.com> Cc: users@dpdk.org; dev@dpdk.org Subject: Re: [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding. Hi Haiyue, It is working ,thanks for your response. can you please tell what kind of performance limitation we have if RTE_I40E_DESCS_PER_LOOP value is less than 4 ? Thanks & Regards, Hemasai On Tue, Sep 3, 2019 at 2:53 PM Perugu Hemasai Chandra Prasad <hemasaiperugu@5g.iith.ac.in> wrote: 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 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-09-03 11:33 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2019-09-03 5:00 [dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding Perugu Hemasai Chandra Prasad 2019-09-03 7:02 ` Wang, Haiyue 2019-09-03 9:23 ` Perugu Hemasai Chandra Prasad 2019-09-03 9:47 ` Perugu Hemasai Chandra Prasad 2019-09-03 11:33 ` Wang, Haiyue
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