Kernel TCP recv / send buffer auto scaling

[Frederic URBAN]

Hello guys,

Since 4.9, there is a auto-scaling tcp buffer size, good functionnality 
but i've a question. I'm using a pair of OpenBSD servers as squid 
proxies. Our internet bandwidth is 1Gb/s so we are able to download @ 90 
Mbytes /s if needed.

When I was using OpenBSD 4.8, i was tuning kernel parameters 
(net.inet.tcp.recv/sendbuffer) to allow faster downloads through the 
proxy but with 5.1 and now 5.3 i'm not able to download faster than 3.5 
Mbytes/s, any idea how i could achieve that with 5.3/5.4 ?

Fred !