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wgengine/magicsock: shorten process internal DERP queue

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DERP writes go via TCP and the host OS will have plenty of buffer space.
We've observed in the wild with a backed up TCP socket kernel side
buffers of >2.4MB. The DERP internal queue being larger causes an
increase in the probability that the contents of the backbuffer are
"dead letters" - packets that were assumed to be lost.

A first step to improvement is to size this queue only large enough to
avoid some of the initial connect stall problem, but not large enough
that it is contributing in a substantial way to buffer bloat /
dead-letter retention.

Updates tailscale/corp#31762

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2025-08-28 12:00:03 -07:00
committed by James Tucker
parent d42f0b6a21
commit f5d3c59a92
6 changed files with 15 additions and 69 deletions
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cmd/k8s-operator/depaware.txt
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@@ -958,7 +958,6 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
tailscale.com/util/syspolicy/rsop from tailscale.com/util/syspolicy+
tailscale.com/util/syspolicy/setting from tailscale.com/util/syspolicy+
tailscale.com/util/syspolicy/source from tailscale.com/util/syspolicy+
tailscale.com/util/sysresources from tailscale.com/wgengine/magicsock
tailscale.com/util/systemd from tailscale.com/control/controlclient+
tailscale.com/util/testenv from tailscale.com/control/controlclient+
tailscale.com/util/truncate from tailscale.com/logtail