On Mon, Oct 14, 2013 at 10:39:18AM -0400, Andy M. wrote: > I am trying to get closer to the switch, unfortunately my boxes are in a > data center I do not have access too. I am working with them to try and > debug this, so far it seems like in general the servers are re transmitting > packets under the load I am testing at, not just packets through HAProxy, > so I don't think this is a problem with HAProxy, but something in their > network. If anything comes up I will update, but as of right now, I think > the proxy is not that cause. Thanks again, you've all been a huge help.
Thanks for the update! Anyway in general, a proxy will not cause retransmission because the proxy does not manipulate packets but streams from the TCP stack. And since the stack advertises the remaining room as its receive window, if the proxy stalls, the TCP stack will advertise zero-window packets, saving the sender from any retransmit. So when you see a retransmit, it's almost always a network issue, and occasionally a TCP stack bug. Best regards, Willy
