diff --git a/Cargo.lock b/Cargo.lock
index 6bece6d..bdbafae 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4069,7 +4069,7 @@ checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
 [[package]]
 name = "smoltcp"
 version = "0.11.0"
-source = "git+https://github.com/XOR-op/smoltcp.git?branch=resize-recv-buffer#1555b5e0c1145df92bfbbb4221d550d73efb3b34"
+source = "git+https://github.com/XOR-op/smoltcp.git?branch=rcv-buf-pinned#60ede1b4ef49426c794b1b25c5c7e39ac3a0f97f"
 dependencies = [
  "bitflags 1.3.2",
  "byteorder",
diff --git a/Cargo.toml b/Cargo.toml
index c039c21..4fe1698 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,6 @@ debug = true
 
 [patch.crates-io]
 rustls = { git = "https://github.com/XOR-op/rustls.delta.git", branch = "unofficial-rel-0.23" }
-smoltcp = { git = "https://github.com/XOR-op/smoltcp.git", branch = "resize-recv-buffer" }
+smoltcp = { git = "https://github.com/XOR-op/smoltcp.git", branch = "rcv-buf-pinned" }
 # Only used to bump x25519-dalek; will be removed once 0.6.1 is released
 boringtun = { git = "https://github.com/XOR-op/boringtun", branch = "master"}
diff --git a/boltconn/src/common/utils.rs b/boltconn/src/common/utils.rs
index 2722eef..4d51e8b 100644
--- a/boltconn/src/common/utils.rs
+++ b/boltconn/src/common/utils.rs
@@ -10,6 +10,7 @@ impl IdGenerator {
     }
 }
 
+#[allow(unused)]
 pub struct TputMeasurement {
     inner: std::sync::Mutex<TputMeasurementInner>,
 }
@@ -36,7 +37,7 @@ impl TputMeasurement {
         inner.accum_bytes += bytes as u64;
         let now = Instant::now();
         let elapsed = now - inner.last_time;
-        if elapsed >= inner.interval || inner.accum_bytes > 1024 * 1024 {
+        if elapsed >= inner.interval {
             let tput = inner.accum_bytes as f64 / elapsed.as_secs_f64();
             inner.accum_bytes = 0;
             inner.last_time = now;
diff --git a/boltconn/src/transport/smol.rs b/boltconn/src/transport/smol.rs
index dd88f96..f1e9cdd 100644
--- a/boltconn/src/transport/smol.rs
+++ b/boltconn/src/transport/smol.rs
@@ -15,7 +15,7 @@ use hickory_proto::TokioTime;
 use hickory_resolver::name_server::RuntimeProvider;
 use hickory_resolver::TokioHandle;
 use rand::Rng;
-use smoltcp::iface::{Interface, SocketHandle, SocketSet};
+use smoltcp::iface::{Interface, PollResult, SocketHandle, SocketSet};
 use smoltcp::phy::{Device, DeviceCapabilities, Medium, RxToken, TxToken};
 use smoltcp::socket::{
     tcp::Socket as SmolTcpSocket, udp::PacketBuffer as UdpSocketBuffer,
@@ -427,7 +427,7 @@ impl SmolStack {
         }
     }
 
-    pub fn drive_iface(&mut self) -> bool {
+    pub fn drive_iface(&mut self) -> PollResult {
         self.iface.poll(
             SmolInstant::now(),
             &mut self.ip_device,
@@ -786,7 +786,7 @@ pub struct VirtualRxToken {
 }
 
 impl RxToken for VirtualRxToken {
-    fn consume<R, F: FnOnce(&mut [u8]) -> R>(mut self, f: F) -> R {
+    fn consume<R, F: FnOnce(&[u8]) -> R>(mut self, f: F) -> R {
         f(&mut self.buf)
     }
 }
diff --git a/boltconn/src/transport/wireguard.rs b/boltconn/src/transport/wireguard.rs
index 3d291d6..316204a 100644
--- a/boltconn/src/transport/wireguard.rs
+++ b/boltconn/src/transport/wireguard.rs
@@ -92,7 +92,6 @@ struct WireguardTunnelInner {
     smol_notify: Arc<Notify>,
     inbound_buf_pool: Arc<Pool<Vec<u8>>>,
     reserved: Option<[u8; 3]>,
-    metric: crate::common::utils::TputMeasurement,
 }
 
 impl WireguardTunnel {
@@ -194,9 +193,6 @@ impl WireguardTunnel {
                 smol_notify,
                 inbound_buf_pool: buf_pool,
                 reserved: config.reserved,
-                metric: crate::common::utils::TputMeasurement::new(std::time::Duration::from_secs(
-                    1,
-                )),
             },
         })
     }
@@ -211,9 +207,6 @@ impl WireguardTunnel {
         let len = self.inner.outbound_recv(buf).await?;
         // Indeed we can achieve zero-copy with the implementation of ring,
         // but there is no hard guarantee for that, so we just manually copy buffer.
-        if let Some(tput) = self.inner.metric.update_to_mbps(len) {
-            // tracing::debug!("WireGuard inbound throughput: {:.2} Mbps", tput);
-        }
         let result = self
             .tunnel
             .lock()