Tcp window size won't go above 130048

Posted by Roger on Server Fault See other posts from Server Fault or by Roger
Published on 2012-10-02T08:38:45Z Indexed on 2012/10/02 9:39 UTC
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tcp

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buffer

I have 2 servers set up with about 80ms latency between them. Both are centos 6 and run a java app that transfers data from on location to another. Both are on 1gbps connections.

I have been trying different sysctl settings and different send & receive buffer settings in java but no matter what I set them to, I cannot get the tcp window size to go above 130048 in the tcp dumps. This equates to roughly 13mbps which is the actual throughput I am getting.

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