From 7e0cdfc68311aecff2177bc0f8de07136c2da9bc Mon Sep 17 00:00:00 2001
From: fanyang <fanyang89@outlook.com>
Date: Sun, 28 Jun 2026 19:15:23 +0800
Subject: [PATCH] hotpath: add measure_all to RingSink Sink impl

Reveals RingSink operation costs:
  poll_ready: 13ns/call (0.57% total)
  start_send: <26ns/call (below top-15 threshold)
  poll_flush: below top-15 threshold

Confirms ring tunnel sink operations are ~33ns/pkt total,
vs 2.04us for MpscTunnelSender::send (which routes through
tokio mpsc channel). The channel intermediary adds ~2us/pkt
of pure overhead.
---
 easytier/src/tunnel/ring.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/easytier/src/tunnel/ring.rs b/easytier/src/tunnel/ring.rs
index 43f8a783..f2a3f0fd 100644
--- a/easytier/src/tunnel/ring.rs
+++ b/easytier/src/tunnel/ring.rs
@@ -130,6 +130,7 @@ impl RingSink {
     }
 }
 
+#[cfg_attr(feature = "hotpath", hotpath::measure_all)]
 impl Sink<SinkItem> for RingSink {
     type Error = SinkError;