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Original question:

TDA4VM: How to run QNX PTP demo at CPSW9 ethernet interface?

TDA4VM: MAC2MAC SPEED problem for QNX

HONGRUN ZHAO
Intellectual 555 points

Part Number: TDA4VM

Hi experts:

I test mac2mac speed under QNX system . the  speed is not 1G only 500M but on linux the speed is up to 930M

then i check the patch 

[FAQ] DRA829VXEVM: Is it possible to connect two DRA829 EVMs via SGMII - Processors forum - Processors - TI E2E support forums

i think QNX system need modify some parameter reference kernel_cpsw9g_virt_increase_rxtx_desc  - 256- > 500

Could you please introduce how to modfiy the  parameter at qnx system  ?

Best Regards!

  • 0
    TI__Guru*** 129041 points

    Hi,

    Apologies for the slow response, TI team is looking into the query.

    Regards,

    kb

  • +1 in reply to KB
    TI__Guru 50263 points

    Hello,

    Thanks for your query.

    Yes, the QNX DEVNP CPSW9G virtual driver has a speed of ~550Mbps when test with the default "iperf -c <ipaddr>" option. But it can increase up to 900Mbps with "iperf -c <ipaddress> -w 128K". Suggest giving this a try.

    Regarding increasing the DMA descriptors from 256 to 500  is described below:

    Note that the driver today by default supports 128 descriptors for RX and 128 descriptors for TX. But this can increase to a MAX of 256 for both RX and TX respectively. This can be specified using the command line parameters when starting the driver.

    For example:

    io-pkt-v6-hc -d cpsw9g  tx_descriptor_cnt=256,rx_descriptor_cnt=256

    The different command line parameter options support by the driver can be using the command:

    use devnp_cpsw9g.so

    Hope this helps.

    Thanks.

  • 0 in reply to Praveen Rao
    Intellectual 555 points

    hi 

    thanks for your repaly

    I read a lot of documents provided by QNX and Ti, and did not find the description of this parameter. Which document describes this parameter

  • 0 in reply to HONGRUN ZHAO
    TI__Guru 50263 points

    Hi,

    All the driver option supported can be looked at using the "use" command on the driver library. This is mentioned in the document link:

    4. PSDK QNX Components — Processor SDK QNX J721E (ti.com)

    Thanks.