When using an
SO_RCVBUF of 10485760 (which is also the current limit as stipulated by
net.core.rmem_max setting, and sending UDP packets faster than the receiving side is able to handle, the
rx_queue column in
/proc/net/udp always grows to pretty much exactly twice the size of
SO_RCVBUF. 20972544 was the highest value I could observe.
So is the SO_RCVBUF not being adhered to? Or is the output of /proc/net/udp wrong?
uname -a Linux mybox 4.3.0-1-amd64 #1 SMP Debian 4.3.3-5 (2016-01-04) x86_64 GNU/Linux