[c-nsp] Network performance question - TCP Window issue?

[Andrew Miehs]

On 30/04/2012, at 3:57 AM, John Neiberger wrote:

> The timing of this is coincidental. I've been helping to troubleshoot
> a similar problem at work for days. Let's say we have three servers,
> A, B and C. We transfer files between them and here is what we see:
> 
> A to B: Fast (around 18 MB/s)
> B to A: Slow (around 1 MB/s)
> A to C: Slow (around 1MB/s)
> C to A: Fast (around 18MB/s)
> 
> In our case, Server A is fast when sending to B but not when sending
> to C. C can send at a high speed when sending back to A, though.
> account for this behavior.

How are you testing this speed? What servers with what connections with which operating system versions?
What is exactly the list of all hardware/ interfaces/ connections between these 3 boxes.
You need to draw this up.

This however is probably a different issue to the original one listed.