linux - Performance tuning via sysctl, what is the difference between setting net.core.rmem_default (r/w) / net.ipv4.tcp_mem / net.ipv4.udp_mem -


what difference between setting read/write mem default via net/core , setting protocol min/max/default net/ipv4 in sysctl?

detailed explanation or resource request

net.core.wmem_default
net.core.rmem_default
net.ipv4.tcp_mem
net.ipv4.udp_mem

thanks

take @ https://www.kernel.org/doc/documentation/networking/ip-sysctl.txt https://www.kernel.org/doc/documentation/sysctl/net.txt

net.ipv4.tcp_mem , net.ipv4.udp_mem limit total kernel memory tcp , udp respectively, others control per socket buffer space


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