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I need to set up a KVM guest with the following sysctl kernel parameters:

net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 87380 16777216 net.ipv4.udp_rmem_min = 1048576 net.ipv4.udp_wmem_min = 1048576 net.ipv4.tcp_no_metrics_save = 1 net.ipv4.tcp_keepalive_probes = 3 net.ipv4.tcp_mtu_probing = 1 net.core.netdev_max_backlog = 300000 net.core.somaxconn = 8192

Do I need to set these sysctl kernel parameters on the KVM host or are they independent of each other?

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  • Let's just apply logic: if you were running a Windows guest from the Linux Host, would there be any relation between settings on guest and host? Commented Dec 18, 2020 at 13:14
  • I mean, if we have a guest with significant network traffic, it might be worth setting up the host as well (ie. increase buffer sizes and etc.). Commented Dec 18, 2020 at 13:41
  • Will the guest NIC settings (checksum offload and etc.) affect the host in some way? Logically, they shouldn't. Commented Dec 18, 2020 at 13:48

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