diff --git a/Cargo.toml b/Cargo.toml
index e69e1838..a7a131c8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,7 +49,7 @@ flume = { version = "0.12.0", default-features = false }
 futures-channel = "0.3.29"
 futures-rustls = { version = "0.26.0", default-features = false }
 futures-util = "0.3.29"
-libc = "0.2.164"
+libc = "0.2.175"
 native-tls = "0.2.13"
 nix = "0.30.1"
 once_cell = "1.18.0"
diff --git a/compio-quic/Cargo.toml b/compio-quic/Cargo.toml
index f5291c9d..b7ae84e6 100644
--- a/compio-quic/Cargo.toml
+++ b/compio-quic/Cargo.toml
@@ -70,6 +70,7 @@ native-certs = ["dep:rustls-native-certs"]
 webpki-roots = ["dep:webpki-roots"]
 h3 = ["dep:h3", "dep:h3-datagram"]
 ring = ["quinn-proto/rustls-ring"]
+windows-gro = []
 
 [[example]]
 name = "http3-client"
diff --git a/compio-quic/build.rs b/compio-quic/build.rs
index 4b852427..1a607163 100644
--- a/compio-quic/build.rs
+++ b/compio-quic/build.rs
@@ -7,7 +7,7 @@ fn main() {
         linux_all: { any(target_os = "linux", target_os = "android") },
         freebsd: { target_os = "freebsd" },
         netbsd: { target_os = "netbsd" },
-        non_freebsd: { any(target_os = "openbsd", target_os = "netbsd") },
+        non_freebsd: { any(target_os = "openbsd", target_os = "netbsd", target_os = "dragonfly") },
         bsd: { any(freebsd, non_freebsd) },
         solarish: { any(target_os = "illumos", target_os = "solaris") },
         apple: { target_vendor = "apple" },
diff --git a/compio-quic/src/connection.rs b/compio-quic/src/connection.rs
index 7acb299f..79fd4cb4 100644
--- a/compio-quic/src/connection.rs
+++ b/compio-quic/src/connection.rs
@@ -7,8 +7,8 @@ use std::{
     time::{Duration, Instant},
 };
 
-use compio_buf::{BufResult, bytes::Bytes};
-use compio_log::{Instrument, error};
+use compio_buf::bytes::Bytes;
+use compio_log::Instrument;
 use compio_runtime::JoinHandle;
 use flume::{Receiver, Sender};
 use futures_util::{
@@ -212,11 +212,9 @@ impl ConnectionInner {
                     }
                     state
                 },
-                BufResult::<(), Vec<u8>>(res, mut buf) = transmit_fut => {
-                    #[allow(unused)]
-                    if let Err(e) = res {
-                        error!("I/O error: {}", e);
-                    }
+                buf = transmit_fut => {
+                    // The following line is required to avoid "type annotations needed" error
+                    let mut buf: Vec<_> = buf;
                     buf.clear();
                     send_buf = Some(buf);
                     self.state()
diff --git a/compio-quic/src/endpoint.rs b/compio-quic/src/endpoint.rs
index 478d00a2..df2379f3 100644
--- a/compio-quic/src/endpoint.rs
+++ b/compio-quic/src/endpoint.rs
@@ -204,7 +204,7 @@ impl EndpointInner {
     fn respond(&self, buf: Vec<u8>, transmit: Transmit) {
         let socket = self.socket.clone();
         compio_runtime::spawn(async move {
-            let _ = socket.send(buf, &transmit).await;
+            socket.send(buf, &transmit).await;
         })
         .detach();
     }
diff --git a/compio-quic/src/socket.rs b/compio-quic/src/socket.rs
index b1622c63..67cdafb4 100644
--- a/compio-quic/src/socket.rs
+++ b/compio-quic/src/socket.rs
@@ -107,7 +107,7 @@ impl<const N: usize> DerefMut for Ancillary<N> {
     }
 }
 
-#[cfg(linux)]
+#[cfg(linux_all)]
 #[inline]
 fn max_gso_segments(socket: &UdpSocket) -> io::Result<usize> {
     unsafe {
@@ -123,16 +123,38 @@ fn max_gso_segments(socket: &UdpSocket) -> io::Result<usize> {
     }
     Ok(512)
 }
-#[cfg(not(any(linux, windows)))]
+#[cfg(not(any(linux_all, windows)))]
 #[inline]
 fn max_gso_segments(_socket: &UdpSocket) -> io::Result<usize> {
     Err(io::Error::from(io::ErrorKind::Unsupported))
 }
 
+#[inline]
+fn error_is_unsupported(e: &io::Error) -> bool {
+    if matches!(
+        e.kind(),
+        io::ErrorKind::Unsupported | io::ErrorKind::InvalidInput
+    ) {
+        return true;
+    }
+    let Some(raw) = e.raw_os_error() else {
+        return false;
+    };
+    #[cfg(unix)]
+    {
+        raw == libc::ENOPROTOOPT
+    }
+    #[cfg(windows)]
+    {
+        raw == WinSock::WSAENOPROTOOPT
+    }
+}
+
 macro_rules! set_socket_option {
     ($socket:expr, $level:expr, $name:expr, $value:expr $(,)?) => {
         match unsafe { $socket.set_socket_option($level, $name, $value) } {
             Ok(()) => true,
+            Err(e) if error_is_unsupported(&e) => false,
             Err(e) => {
                 compio_log::warn!(
                     level = stringify!($level),
@@ -140,20 +162,7 @@ macro_rules! set_socket_option {
                     "failed to set socket option: {}",
                     e
                 );
-                if e.kind() == io::ErrorKind::InvalidInput {
-                    true
-                } else if e.raw_os_error()
-                    == Some(
-                        #[cfg(unix)]
-                        libc::ENOPROTOOPT,
-                        #[cfg(windows)]
-                        WinSock::WSAENOPROTOOPT,
-                    )
-                {
-                    false
-                } else {
-                    return Err(e);
-                }
+                return Err(e);
             }
         }
     };
@@ -191,13 +200,13 @@ impl Socket {
             #[cfg(all(unix, not(any(non_freebsd, solarish))))]
             set_socket_option!(socket, libc::IPPROTO_IP, libc::IP_RECVTOS, &1);
             #[cfg(windows)]
-            set_socket_option!(socket, WinSock::IPPROTO_IP, WinSock::IP_ECN, &1);
+            set_socket_option!(socket, WinSock::IPPROTO_IP, WinSock::IP_RECVECN, &1);
         }
         if is_ipv6 {
             #[cfg(unix)]
             set_socket_option!(socket, libc::IPPROTO_IPV6, libc::IPV6_RECVTCLASS, &1);
             #[cfg(windows)]
-            set_socket_option!(socket, WinSock::IPPROTO_IPV6, WinSock::IPV6_ECN, &1);
+            set_socket_option!(socket, WinSock::IPPROTO_IPV6, WinSock::IPV6_RECVECN, &1);
         }
 
         // pktinfo / destination address
@@ -217,6 +226,7 @@ impl Socket {
         }
 
         // disable fragmentation
+        #[allow(unused_mut)]
         let mut may_fragment = false;
         if is_ipv4 {
             #[cfg(linux_all)]
@@ -248,16 +258,11 @@ impl Socket {
                     &libc::IPV6_PMTUDISC_PROBE,
                 );
             }
-            #[cfg(all(unix, not(non_freebsd)))]
+            #[cfg(unix)]
             {
                 may_fragment |=
                     set_socket_option!(socket, libc::IPPROTO_IPV6, libc::IPV6_DONTFRAG, &1);
             }
-            #[cfg(non_freebsd)]
-            {
-                // FIXME: workaround until https://github.com/rust-lang/libc/pull/3716 is released (at least in 0.2.155)
-                may_fragment |= set_socket_option!(socket, libc::IPPROTO_IPV6, 62, &1);
-            }
             #[cfg(windows)]
             {
                 may_fragment |=
@@ -266,13 +271,13 @@ impl Socket {
         }
 
         // GRO
-        #[allow(unused_mut)] // only mutable on Linux and Windows
+        #[allow(unused_mut)]
         let mut max_gro_segments = 1;
-        #[cfg(linux)]
+        #[cfg(linux_all)]
         if set_socket_option!(socket, libc::SOL_UDP, libc::UDP_GRO, &1) {
             max_gro_segments = 64;
         }
-        #[cfg(windows)]
+        #[cfg(all(windows, feature = "windows-gro"))]
         if set_socket_option!(
             socket,
             WinSock::IPPROTO_UDP,
@@ -332,7 +337,7 @@ impl Socket {
 
         let mut ecn_bits = 0u8;
         let mut local_ip = None;
-        #[allow(unused_mut)] // only mutable on Linux
+        #[allow(unused_mut)]
         let mut stride = len;
 
         // SAFETY: `control` contains valid data
@@ -386,7 +391,7 @@ impl Socket {
                     }
 
                     // GRO
-                    #[cfg(linux)]
+                    #[cfg(linux_all)]
                     (libc::SOL_UDP, libc::UDP_GRO) => stride = *cmsg.data::<libc::c_int>() as usize,
                     #[cfg(windows)]
                     (WinSock::IPPROTO_UDP, UDP_COALESCED_INFO) => {
@@ -408,7 +413,7 @@ impl Socket {
         BufResult(Ok(meta), buffer)
     }
 
-    pub async fn send<T: IoBuf>(&self, buffer: T, transmit: &Transmit) -> BufResult<(), T> {
+    pub async fn send<T: IoBuf>(&self, buffer: T, transmit: &Transmit) -> T {
         let is_ipv4 = transmit.destination.ip().to_canonical().is_ipv4();
         let ecn = transmit.ecn.map_or(0, |x| x as u8);
 
@@ -492,8 +497,10 @@ impl Socket {
         }
 
         // GSO
-        if let Some(segment_size) = transmit.segment_size {
-            #[cfg(linux)]
+        if let Some(segment_size) = transmit.segment_size
+            && segment_size < transmit.size
+        {
+            #[cfg(linux_all)]
             builder.try_push(libc::SOL_UDP, libc::UDP_SEGMENT, segment_size as u16);
             #[cfg(windows)]
             builder.try_push(
@@ -501,31 +508,42 @@ impl Socket {
                 WinSock::UDP_SEND_MSG_SIZE,
                 segment_size as u32,
             );
-            #[cfg(not(any(linux, windows)))]
+            #[cfg(not(any(linux_all, windows)))]
             let _ = segment_size;
         }
 
         let len = builder.finish();
         control.len = len;
 
-        let buffer = buffer.slice(0..transmit.size);
-        let BufResult(res, (buffer, _)) = self
-            .inner
-            .send_msg(buffer, control, transmit.destination)
-            .await;
-        let buffer = buffer.into_inner();
-        match res {
-            Ok(_) => BufResult(Ok(()), buffer),
-            Err(e) => {
-                #[cfg(linux)]
-                if let Some(libc::EIO) | Some(libc::EINVAL) = e.raw_os_error()
-                    && self.max_gso_segments() > 1
-                {
-                    self.has_gso_error.store(true, Ordering::Relaxed);
+        let mut buffer = buffer.slice(0..transmit.size);
+
+        loop {
+            let res;
+            BufResult(res, (buffer, control)) = self
+                .inner
+                .send_msg(buffer, control, transmit.destination)
+                .await;
+
+            match res {
+                Err(e) if e.kind() == io::ErrorKind::Interrupted => continue,
+                Ok(_) => break,
+                Err(e) => {
+                    #[cfg(linux_all)]
+                    if matches!(e.raw_os_error(), Some(libc::EIO) | Some(libc::EINVAL))
+                        && self.max_gso_segments() > 1
+                    {
+                        self.has_gso_error.store(true, Ordering::Relaxed);
+                    }
+                    #[cfg(unix)]
+                    if matches!(e.raw_os_error(), Some(libc::EMSGSIZE)) {
+                        break;
+                    }
+                    compio_log::info!("failed to send UDP datagram: {e:?}, {transmit:?}");
                 }
-                BufResult(Err(e), buffer)
             }
         }
+
+        buffer.into_inner()
     }
 
     pub fn close(self) -> impl Future<Output = io::Result<()>> {
@@ -542,7 +560,7 @@ impl Clone for Socket {
             max_gso_segments: self.max_gso_segments,
             has_gso_error: AtomicBool::new(self.has_gso_error.load(Ordering::Relaxed)),
             #[cfg(freebsd)]
-            encode_src_ip_v4: self.encode_src_ip_v4.clone(),
+            encode_src_ip_v4: self.encode_src_ip_v4,
         }
     }
 }
@@ -565,7 +583,7 @@ mod tests {
         let passive_addr = passive.local_addr().unwrap();
         let active_addr = active.local_addr().unwrap();
 
-        let (_, content) = active.send(content, &transmit).await.unwrap();
+        let content = active.send(content, &transmit).await;
 
         let segment_size = transmit.segment_size.unwrap_or(transmit.size);
         let expected_datagrams = transmit.size / segment_size;