Problem: No message batching in the UDP engine

[eponsko]

Using RADIO/DISH over UDP unicast/multicast results in a fairly low amounts of messages per seconds compared to its TCP counterpart (with about a factor of 10). One reason for this could be the lack of message batching when using UDP.

Current message format on UDP is (in my understanding):

udp-payload = group-name message-body group-name = short-size 1*255 group-name-char

Perhaps it could be modifed to something like this? Reuses the existing stream encoding to fit multiple messages into a single UDP packet, and place group name inside the message-body.

udp-payload = message-more message-last message-more = ( %x01 short-size | %x03 long-size ) message-body message-last = ( %x00 short-size | %x02 long-size ) message-body message-body = group-name body group_name = short-size 115 group-name-char body = *OCTET

I'm not sure how batching is handled for the stream protocols, I guess here we could/should limit the size of the final UDP packet to either maximum UDP payload (~65500 bytes), maximum MTU from the interface (~1500), or something like the typical UDP sizes on the internet (something like 508, 512, 548, depending on who you ask). Currently MAX_UDP_SIZE is set to 8192, not sure what the rationale for that is (since it doesn't avoid fragmentation nor full use of the UDP payload).

long-size being 64 bits is a bit overkill, perhaps a medium-size with 16 bits would make more sense (since thats the maximum UDP payload size).

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[alonbl]

Hi, Any news?