we are on a debian system and are trying to tune the tcp/ip stack to our needs. We all know that you can set the maximum tcp buffer size with some kernel parameters like this:
net.ipv4.tcp_wmem = 4096 16384 4194304 net.ipv4.udp_wmem_min = 4096 net.core.wmem_max = 261071
To calculate the maximum buffer size for your needs you "just" have to calculate it. (see http://fasterdata.es.net/TCP-tuning/ )
But as we do not know the round-trip-time of our users, it is quite difficult. It might be ok to assume something between 20 and 60 ms. But for an mobile network it is something like 100-300 ms (tested with my phone). So it is quite difficult to know how many data might be "on the line".
We would like to see the actual buffer size and the utilization of it.
Does anybody know how to sneek into the actual tcp write and receive buffers?