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Posted to dev@qpid.apache.org by "Ken Giusti (Jira)" <ji...@apache.org> on 2021/05/10 19:32:00 UTC
[jira] [Assigned] (DISPATCH-1975) TCP adaptor sends only 512-byte
packets over network
[ https://issues.apache.org/jira/browse/DISPATCH-1975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ken Giusti reassigned DISPATCH-1975:
------------------------------------
Assignee: Charles E. Rolke
> 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
> Assignee: Charles E. Rolke
> Priority: Major
>
> 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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