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The maximum socket receive buffer size (SO_RCVBUF) is set from the value in /proc/sys/net/core/rmem_max. When this value is close to INT_MAX, the select() system call used by IO::Select->can_read() never returns true. This causes packets to never be read. Therefore, reduce the maximum socket receive buffer size to a value which works.
xCAT is a toolkit for the deployment and administration of clusters. xCAT documentation is available at: http://xcat-docs.readthedocs.org/ xCAT is made available as open source software under the EPL license: http://www.opensource.org/licenses/eclipse-1.0.php