Hello
On 19/05/15 11:49, Leung Wang Hei wrote:
There seems to be an invisible barrier in the socket buffer for MQ network
bridge. We expect increasing tcp socket buffer size would give high
throughput but the outcome is not. Here are the test details:
- 2 brokers(A, B) bridged together over WLAN with 140ms network latency.
- One single duplex network connector is setup at broker B, statically
includes one topic
- 10 producers each sending 10K message. All are AMQObjectMessage.
- Socket buffer size set as url argument in network connector at broker B
and transport connector at broker A
- Use wireshark to capture link traffic
Wireshark capture shows that throughput always capped at around
3.74Mbit/sec, the max throughput as with default 64K socket buffer. Attached
the config details.
I don't expect a bug in MQ, am I missing something? Any advice would be
greatly appreciated.
It't not a bug in ActiveMQ, it's the result of the Bandwidth/Delay
Product - take the bandwidth of your link in megabits/sec and divide it
by the round trip time in milliseconds.
See http://en.wikipedia.org/wiki/TCP_tuning for more details - you need
to increase the TCP window size at both broker A and broker B to
something larger so you can have more data "on the wire".
Peter
