Hello, I have a four node cluster. Each node connected with a centralized switch. MTU size is default, 1500. On each node, a program continuously tries to multi-cast as many messages as possible. With the default settings (corosync.conf), buffer overflow does *not* occur till program runs on three nodes. However as soon as fourth node start multi-casting, overflow occur and significantly reduce the performance.
Why buffer overflow with just four nodes? Is hardware topology, centralized switch, is not correct? Later, I reduced window_size and max_messages to 20 and 5 respectively. No overflow but not sure whether performance is as expected. I would like to better understand these two parameters. Lets say in a cluster of four nodes, I have window_size 50 and max_messages also set to 50. Does that mean only one node will be able to multi-cast in a single token rotation? If one node was not able to multi-cast because window_size is reached, when and how this node will get opportunity to send message? Thanks, Satish
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