HUA TCP Benchmark

Hi dp,

I checked with the relevant team, and they suggested the following code changes that might help tune the system for better TCP throughput:

1. Change the default TCP socket Rx and Tx buffer sizes if needed (this might already be done in the version of MCSDK  you are using, but double-check to see if these changes are there):

/* TCP Transmit buffer size */
//rc = 8192;
rc = 64000;
CfgAddEntry( hCfg, CFGTAG_IP, CFGITEM_IP_SOCKTCPTXBUF,
CFG_ADDMODE_UNIQUE, sizeof(uint), (uint8_t *)&rc, 0 );

/* TCP Receive buffer size (copy mode) */
//rc = 8192;
rc = 64000;
CfgAddEntry( hCfg, CFGTAG_IP, CFGITEM_IP_SOCKTCPRXBUF,
CFG_ADDMODE_UNIQUE, sizeof(uint), (uint8_t *)&rc, 0 );

2. Make sure NDK is re-built with considerably more buffers. I think the default is 192. You can try 192* 4 or 192 * 5.  This can be experimented with. The place to make this change is in the ndk directory: packages/ti/ndk/src/os/pbm.c. Change this define #define PKT_NUM_FRAMEBUF 192  Instructions on how to rebuild NDK are at http://processors.wiki.ti.com/index.php/Rebuilding_the_NDK_Core

3. Ensure that the variable NIMU_NUM_RX_DESC is defined as "#define NIMU_NUM_RX_DESC   110u". It is defined in the resource_manager.h file in the PDK directory.

In addition to the above, the team mentioned that this benchmark example with 6678 hooked to a PC may not generate accurate throughput numbers due to the speed of the PC connection, packet size, and other factors as well. There is another benchmark test that does loopback, which would present more accurate throughput numbers since it eliminates the variability associated with the PC. It requires a SMARTBITS generator. The team will put together instructions on how to run this loopback demo, and provide this in a week. I will provide you with those instructions as soon as I receive them.