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C6678 EMAC example – how can I increase the packet send & receive rates?

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Yatsir Shmueli

Hi,

I used the EMAC example (PA_emacExample_exampleProjec) as a basis to application that send & receive packets from the EVM board to an external PC.

The application is working fine, but the performance is very poor… the packet send & receive rates are very low (less than 100 packets per second).

 

I am getting this message: “No Tx free descriptor” although I increased the number of descriptors significantly.

 

I found that the problem is maybe related to the SGMII configuration. When I configure port 1 (Init_SGMII function) similar to the loopback configuration in the  EMAC example , the packets send rate is good (of course the packets are not arriving to the external PC).

 

What can be the cause of this performance degradation?

 

Thanks!

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Yatsir Shmueli

• Apr 4, 2012 6:04 PM
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3 Replies

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  Yatsir Shmueli

  

  • Apr 16, 2012 9:24 AM

  Any ideas?

   

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• Genius 9915 points

  

  ArunMani

  

  • Apr 17, 2012 2:49 AM

  In reply to Yatsir Shmueli:

  DO you have the setup in a local network. If you have a lot of traffic in the network, that might slow the performance.

  Thanks,

  Arun.

  If you need more help, please reply back. If this answers the question, please click  Verify Answer  , below.

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• Intellectual 300 points

  

  Yatsir Shmueli

  

  • Apr 17, 2012 8:40 AM

  In reply to ArunMani:

  Hi,

  The C6678 EVM  is connected to 2 CPU through network switch, and all the packets/data in the network are sending from the EVM or to the EVM - but in very low rates.

  The performance is poor even if I’m disconnecting the network cable to the EVM (in transmit from EVM mode).

   

  I think that something in my configuration is wrong… but it’s based on the EMAC example (PA_emacExample_exampleProjec).

   

  I’m seeing the same behavior in the EMAC example:

  When I’m changing the MAX_NUM_PACKETS define to:

  #define                     MAX_NUM_PACKETS                         10000u

  and configure the SGMII (in “Init_SGMII” function) to:

  CSL_SGMII_disableMasterMode (macPortNum);

  // CSL_SGMII_enableLoopback (macPortNum);

   

  Thanks.

   

   

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