Bela Ban created JGRP-1994: ------------------------------ Summary: TCP: remove send queues Key: JGRP-1994 URL: https://issues.jboss.org/browse/JGRP-1994 Project: JGroups Issue Type: Task Reporter: Bela Ban Assignee: Bela Ban Fix For: 4.0 When {{TCP.use_send_queues}} is enabled, sending a message puts it in a queue from which a sender thread dequeues it and sends it. This was a bad idea from the start, because * We create 1 additional (sender) thread per peer. That's 999 threads *per member* if we have a cluster of 1000. Besides, more threads leads to increased context switching * The queue only tapers over blocking on a TCP write, as it will fill up if the TCP write blocks. So the problem of a bloking write is only moved to a different part of the system, not eliminated. * We have to *make a copy of every buffer* to be sent as buffers are reused -> unneeded memory allocation -- This message was sent by Atlassian JIRA (v6.4.11#64026)