- Posted In
- Red Hat Enterprise Linux
can anyone help me understand what is rcv_space in the 'ss --info output', e.g.:
# ss --info dst 220.127.116.11 State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 0 18.104.22.168:39464 22.214.171.124:ssh cubic wscale:7,0 rto:204 rtt:7.5/3 ato:40 cwnd:10 ssthresh:15 send 15.4Mbps rcv_rtt:4 rcv_space:517488
Second question is what units rcv_space is measured in. I noticed that that it value is always devidable by 8.
Third question is why is rcv_space larger than the limits net.core.rmem_max and net.ipv4.tcp_rmem
net.core.wmem_max = 131071 net.core.rmem_max = 13107 net.core.wmem_default = 229376 net.core.rmem_default = 229376 net.ipv4.tcp_mem = 7270 9693 14540 net.ipv4.tcp_wmem = 4096 16384 4194304 net.ipv4.tcp_rmem = 4096 8192 16384
Fourth question is how can one verify that the above sysctl parameters take effect. I thought ss would do it, but now I am not so sure.