ytcisme 3616ffa284 proxy/ipvs: avoid per-interface RTM_GETADDR dump in GetAllLocalAddressesExcept ...

GetAllLocalAddressesExcept previously iterated over net.Interfaces() and
called iface.Addrs() for each interface. iface.Addrs() internally performs
a full RTM_GETADDR netlink dump for the entire node and then filters in
user space. With many interfaces and many addresses (for example tens of
thousands of ClusterIPs bound to kube-ipvs0) the cost is
O(N_interfaces * N_addresses) and dominates syncProxyRules latency.

This change replaces the per-interface loop with a single
netlink.AddrList(nil, unix.AF_UNSPEC) call that dumps all addresses on
the node in one RTM_GETADDR request, then filters by LinkIndex in user
space. This makes the call O(N_addresses) and avoids the per-interface
fan-out.

On a production node with 251 interfaces and 19757 addresses, this
reduces GetAllLocalAddressesExcept latency from 34.8s to 60ms (~705x).

2026-05-24 13:31:10 +08:00

6.9 KiB

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