[jboss-jira] [JBoss JIRA] (JGRP-1994) TCP: remove send queues

[Bela Ban (JIRA)]

     [ https://issues.jboss.org/browse/JGRP-1994?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-1994.
----------------------------
    Resolution: Done


> 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



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