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| Subject: NRPC, TCP Window size of 512 Bytes? |
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| Product Area: Platform |
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| Technical Area: Functionality |
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| Platform: Windows |
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| Release: 8.5.3 |
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| Reproducible: Always |
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Hi All,
This isn't, technically, a Domino problem but it is a problem that affects only Domino on our servers.
Domino replication has been unreasonably slow; Having worked with Domino for many years, I know it isn't supposed to be this slow. For an example, two VM's sitting on the same hardware with 10Gbps virtual nics were replicating at a maximum of 20-30Mbps. Communication between our physical boxes is limited to about 4-10Mbps. Even though all of these servers are connected via 1Gbps networks. Other protocols, even Windows file copy over UNC paths, achieve 500-600Mbps between the same servers.
When I delved into this problem with IBM support, we found that traffic on port 1352 had extremely tiny TCP Window sizes (511-513 Bytes) as opposed to the rest of the traffic that carries ~64,000 bytes. Obviously that is the problem.
However, we have no traffic shaping hardware between the servers and Windows is reporting "normal" for its sizing... I'm stumped as to what is affecting ONLY nrpc traffic and why.
IBM says that Domino doesn't have anything to do with that level of network shaping... so... not sure where to go on this one.
Any thoughts?
 
Feedback number WEBB9GQSTP created by ~Hank Kirelitgon on 02/27/2014
Status: Open
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