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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?
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.
If you need more help, please reply back. If this answers the question,
please click Verify Answer , below.
In reply to ArunMani:
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_enableLoopback (macPortNum);
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