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?
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.
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);
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.