"No buffer space available" when sending on Mac OS -------------------------------------------------- Key: JGRP-1792 URL: https://issues.jboss.org/browse/JGRP-1792 Project: JGroups Issue Type: Bug Reporter: Bela Ban Assignee: Bela Ban Priority: Minor Fix For: 3.5 When sending multicast messages (with MPerf & fast.xml), the following message appears: {noformat} 8981 [ERROR] UDP: JGRP000029: A: failed sending message to cluster (1053 bytes): java.io.IOException: No buffer space available, headers: MPerf: DATA999, NAKACK2: [MSG, seqno=1003], UDP: [cluster_name=mperf] {noformat} The messages *are* received, but the error message occurs on almost every message (1 sender thread sending 1000 messages). With {{UdpPerf}} (also shipped with JGroups), which also multicasts messages, the error doesn't happen. With {{UPerf}}, which uses unicasts, the error doesn't occur either. Todo: compare UdpPerf to MPerf (UDP protocol) to see what the diff is.