Charles E. Rolke created DISPATCH-1975:
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Summary: TCP adaptor sends only 512-byte packets over network
Key: DISPATCH-1975
URL: https://issues.apache.org/jira/browse/DISPATCH-1975
Project: Qpid Dispatch
Issue Type: Bug
Components: Protocol Adaptors
Affects Versions: 1.15.0
Reporter: Charles E. Rolke
h2. Setup
Running some iperf3 tests with a single router over localhost interfaces and
looking at wireshark traces.
h2. Observation
* router is receiving from the iperf3 client in 64k-byte packets
* router is sending to the iperf3 server in 512-byte packets
h2. Discussion
This is perfectly understandable if the iperf3 server connection is setting
NO_DELAY=true.
This is really bad for performance in general. Network performance loves bigger
data frames on the wire.
Single-router performance would be improved if dispatch coalesced the 512-byte
buffers into something bigger before handing them off to proton. The idea is
for TCP to share the HTTP2 raw buffering scheme that uses 16k-byte proton raw
buffers.
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