What is rmem and wmem?

Checking for rmem_default=262144; found rmem_default=65535. Failed <<<<
Checking for rmem_max=262144; found rmem_max=131071. Failed <<<<
Checking for wmem_default=262144; found wmem_default=65535. Failed <<<<
Checking for wmem_max=262144; found wmem_max=131071. Failed <<<<
Check complete. The overall result of this check is: Failed <<<<