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Bug
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Resolution: Done
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Major
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None
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None
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None
It was found a delay with small packets sent by the EJB client over HTTP and awaiting for server acks between each packet send. It can take up to 40 ms of a delay for the packets to be acked so the next packet send is delayd by 40 ms. I tested with https://github.com/jboss-developer/jboss-eap-quickstarts/tree/7.4.x/ejb-remote and see such a concern. Install kernel-modules-extra matching your kernel and you can use sch_netem to easily insert TCP latency:
Insert delay $ sudo dnf install kernel-modules-extra-4.18.0-513.24.1.el8_9.x86_64 $ sudo modprobe sch_netem $ sudo tc qdisc add dev lo root netem delay 500ms Remove delay $ sudo tc qdisc del dev lo root
And I see the client sends the post line and headers then waits for an ack before sending the post body:
Client Sends post line and headers: 8 2024-08-05 17:07:26.880864603 127.0.0.1 127.0.0.1 TCP 508 33834 → 8080 [PSH, ACK] Seq=1 Ack=1 Win=43776 Len=442 TSval=3831831052 TSecr=3831830514 [TCP segment of a reassembled PDU] Server acks: 9 2024-08-05 17:07:27.380959914 127.0.0.1 127.0.0.1 TCP 66 8080 → 33834 [ACK] Seq=1 Ack=443 Win=44800 Len=0 TSval=3831831552 TSecr=3831831052 Sends post body: 10 2024-08-05 17:07:27.881213665 127.0.0.1 127.0.0.1 HTTP 90 POST /wildfly-services/ejb/v1/invoke/-/ejb-remote-server-side/-/ CalculatorBean/-/org.jboss.as.quickstarts.ejb.remote.stateless.RemoteCalculator/add/int/int HTTP/1.1 (application/x-wf-ejb-jbmar-invocation)
Would there be any means of getting a single packet sent for that EJB POST to decrease back and forth latency? Or are we missing any TCP_NODELAY on the EJB client to proceed sending the second packet before the server ACK?
- clones
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- Resolved
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- Closed
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