Andi Kleen wrote:
Latency was very
important, so we ended up doing essentially a multicast unix socket
rather than taking the extra penalty for UDP multicast.
What extra penalty? Local UDP shouldn't be much more expensive than Unix.
On a 1.4GHz P4 I measured a 44% increase in latency between a unix
datagram and a UDP datagram.
For UDP it has to go down the udp stack, then the ip stack, then through
the routing tables and back up the receive side.
The unix socket just hashes to get the destination and delivers the message.
Chris
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