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net/udprelay: use batching.Conn (#16866)

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This significantly improves throughput of a peer relay server on Linux.

Server.packetReadLoop no longer passes sockets down the stack. Instead,
packet handling methods return a netip.AddrPort and []byte, which
packetReadLoop gathers together for eventual batched writes on the
appropriate socket(s).

Updates tailscale/corp#31164

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2025-08-19 14:44:39 -07:00
committed by GitHub
parent 5c560d7489
commit d4b7200129
6 changed files with 153 additions and 63 deletions
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4
net/batching/conn_linux_test.go
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@@ -310,7 +310,7 @@ func TestMinReadBatchMsgsLen(t *testing.T) {
// So long as magicsock uses [Conn], and [wireguard-go/conn.Bind] API is
// shaped for wireguard-go to control packet memory, these values should be
// aligned.
if MinReadBatchMsgsLen() != conn.IdealBatchSize {
t.Fatalf("MinReadBatchMsgsLen():%d != conn.IdealBatchSize(): %d", MinReadBatchMsgsLen(), conn.IdealBatchSize)
if IdealBatchSize != conn.IdealBatchSize {
t.Fatalf("IdealBatchSize: %d != conn.IdealBatchSize(): %d", IdealBatchSize, conn.IdealBatchSize)
}
}