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derp: intern key.NodePublic across the server

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Consistently interning the NodePublic's throughout DERP, particularly
inside the maps reduces memory usage and reduces lookup costs in the
associated data structures.

It is not clear exactly how efficient the weak pointers will be in
practice, but estimating this using derpstress with 10k conns pushing
40kpps in each direction, this is patch grows heap at approximately half
the rate vs.  the old code and has fewer instances of long stalls that
trigger i/o timeouts for the clients.

Updates tailscale/corp#24485

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2024-11-07 12:26:43 -08:00
parent 3b93fd9c44
commit f7ad04bea4
12 changed files with 178 additions and 151 deletions
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2
cmd/k8s-operator/depaware.txt
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@@ -1010,4 +1010,4 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
unicode from bytes+
unicode/utf16 from crypto/x509+
unicode/utf8 from bufio+
unique from net/netip
unique from net/netip+