NetX Duo DHCP and BSD sending large blocks of data

I'm using NetX Duo DHCP and BSD. When using BSD to send a large amount of data (ex. 4k) from the S5 promotion kit, it seems the network connection drops and then reconnects. If I break into 4 1k blocks, I get the same results. If I put a tx_thread_sleep(1) between each 1k block, the send works without issues.

What am I missing? Did I miss a setting or missed an important point somewhere. Thanks for any help.

Kevin

garyj over 6 years ago

Hi Kevin,

What is the packet pool size and the number of packets available in the pool for the networks stack? You can try to increase the size of packets in the pool to see if it helps. You can also enable IP fragmentation in the IP instance to see if that has any effect.

-Gary
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klow over 6 years ago

Gary,

The packet pool size and number of packets are the default values. Packet size = 640 bytes and number of packets in pool = 16. I can try with different size packets and enabling IP fragmentation to see if it makes a difference. Thanks for the suggestions.

Kevin
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garyj over 6 years ago in reply to klow

Kevin,

The defaults will not work well for you - try packet size 1538 and 32 packets in the pool as a starting point.

-Gary
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klow over 6 years ago in reply to garyj

Gary, thanks so much for the info. I changed the packet size to 1540 (had to be divisible by 4) and packets in pool to 32. This solved the issues I was having.

Kevin
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@remo over 6 years ago

For the sake of relyability I did propose to enlarge the package size to 1568.
Reasoning:
The internal structure of an Ethernet frame is specified in IEEE 802.3
where the maximum size of payload is defined as 1500bytes.
Add 0x38 (56 dez) for the ETH, IP and UDP/TCP Header
Then to be on the save side align to a 32byte value which results in 1568.

Good luck
Remo
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garyj over 6 years ago in reply to @remo

Remo,

Yes, Thanks.
You are correct, It was a typo on my part - the correct size should be 1568.

-Gary
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