sendto drops packets on udp stream

Senthil Kumar

Hi,

I am observing while sending udp packets using sendto function, some packets are not transfered through network but sendto doesn't return with error. If i am sending with delay between packets i am getting all the packets.

For example, on transmitting 10000 packets using sendto, udp stats shows no of packets sent is 10420 but at receiver side it shows no of packets received is 6993.

Here at the transmitter side udp stats shows no of packets sent is 10420 but gTxCounter in nimu driver shows only 6700 packets. It seems though sendto pass the packets but nimu doesn't receive all the packets as gTxCounter value is less than the transmitted.

NDK Version: 2.21.01.38

MCSDK: 2.1.2.6

Is there any issues or modifications on NDK.

Regards,

Senthil

over 11 years ago

0 David Friedland over 11 years ago

TI__Mastermind 18320 points

Senthil,

I have moved this thread over to the device forum in hopes that it will get a response there...

0 Ralf Goebel over 11 years ago

Genius 3715 points

Hi Senthil,

there is a problem with the NIMU driver if the CPU sends packets faster than the network can handle:
http://e2e.ti.com/support/embedded/tirtos/f/355/p/253488/891759.aspx

The driver will drop packets if the transmit buffer is full. This can also happen with TCP if you use more than one socket or if you increase the TCP transmit buffer size to 32kB.

Please take a look at the variable gTxDropCounter. If it increases over time, then that's the problem.

Ralf

0 Pubesh over 11 years ago in reply to Ralf Goebel

TI__Mastermind 20790 points

Senthil,

We noticed similar kind of issue in the past, and also thanks to Ralf for your notification on this issue. Find the similar E2E post.
http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/p/214649/758508.aspx#758508

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sendto drops packets on udp stream