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fix: increases DERP send queue length to 512 for increased throughput #54

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May 30, 2024
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fix: increases DERP send queue length to 512 for increased throughput #54

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8 changes: 7 additions & 1 deletion derp/derp_server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,13 @@ func init() {
}

const (
perClientSendQueueDepth = 32 // packets buffered for sending
// perClientSendQueueDepth is the number of packets to buffer for sending.
// CODER: We've modified this to 512, up from 32 in upstream Tailscale to improve DERP
// throughput. 32 is an understandable number for big, public DERP servers that Tailscale run,
// serving many thousands of connections, and where Tailscale is footing the bill. In Coder's
// use case, we are serving hundreds to low thousands of users and the user's own company is
// paying the bills. In testing, it increases DERP throughput up to 6x.
perClientSendQueueDepth = 512
writeTimeout = 2 * time.Second
)

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