‘No buffer space available’ error on FreeBSD

By Glen Lumanau|Unix|2 Comments

‘No buffer space available’ ussualy happended on a high traffic FreeBSD servers. The reasons of that error is the request of socket buffer (send/recv) is higher than maximum socket buffer.

Default value of them are

kern.ipc.maxsockbuf: 262144
net.inet.tcp.recvspace: 65536
net.inet.tcp.sendspace: 32768

You need to increase those value if you have a high traffic FreeBSD server.

Test with

nc -l 1234 > /dev/null

To get rid of ‘No buffer space available’ error, there’s an easy way

sysctl -w net.inet.tcp.recvspace=512000

sysctl -w kern.ipc.maxsockbuf=1024000