diff --git a/benches/netbench/src/rust-tcp-bw/client.rs b/benches/netbench/src/rust-tcp-bw/client.rs
index 26bf2817c..45d7fbb79 100644
--- a/benches/netbench/src/rust-tcp-bw/client.rs
+++ b/benches/netbench/src/rust-tcp-bw/client.rs
@@ -7,7 +7,7 @@ extern crate rust_tcp_io_perf;
 
 use rust_tcp_io_perf::config;
 use rust_tcp_io_perf::connection;
-use std::io::Write;
+use std::io::{self, Write};
 
 fn main() {
 	let args = config::parse_config();
@@ -24,9 +24,15 @@ fn main() {
 		let buf = vec![0; n_bytes];
 
 		for _i in 0..n_rounds {
-			match stream.write_all(&buf) {
-				Ok(_) => {}
-				Err(err) => panic!("crazy stuff happened while sending {}", err),
+			let mut pos = 0;
+
+			while pos < buf.len() {
+				let bytes_written = match stream.write(&buf[pos..]) {
+					Ok(len) => len,
+					Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => 0,
+					Err(e) => panic!("encountered IO error: {}", e),
+				};
+				pos += bytes_written;
 			}
 		}
 		stream.flush().expect("Unexpected behaviour");
diff --git a/hermit-sys/src/net/device.rs b/hermit-sys/src/net/device.rs
index ae71b0387..b6e954519 100644
--- a/hermit-sys/src/net/device.rs
+++ b/hermit-sys/src/net/device.rs
@@ -20,8 +20,8 @@ extern "Rust" {
 	fn sys_get_mtu() -> Result<u16, ()>;
 	fn sys_get_tx_buffer(len: usize) -> Result<(*mut u8, usize), ()>;
 	fn sys_send_tx_buffer(handle: usize, len: usize) -> Result<(), ()>;
-	fn sys_receive_rx_buffer() -> Result<&'static mut [u8], ()>;
-	fn sys_rx_buffer_consumed() -> Result<(), ()>;
+	fn sys_receive_rx_buffer() -> Result<(&'static mut [u8], usize), ()>;
+	fn sys_rx_buffer_consumed(handle: usize) -> Result<(), ()>;
 	fn sys_free_tx_buffer(handle: usize);
 }
 
@@ -123,7 +123,7 @@ impl<'a> Device<'a> for HermitNet {
 
 	fn receive(&'a mut self) -> Option<(Self::RxToken, Self::TxToken)> {
 		match unsafe { sys_receive_rx_buffer() } {
-			Ok(buffer) => Some((RxToken::new(buffer), TxToken::new())),
+			Ok((buffer, handle)) => Some((RxToken::new(buffer, handle), TxToken::new())),
 			_ => None,
 		}
 	}
@@ -137,11 +137,12 @@ impl<'a> Device<'a> for HermitNet {
 #[doc(hidden)]
 pub struct RxToken {
 	buffer: &'static mut [u8],
+	handle: usize,
 }
 
 impl RxToken {
-	pub fn new(buffer: &'static mut [u8]) -> Self {
-		Self { buffer }
+	pub fn new(buffer: &'static mut [u8], handle: usize) -> Self {
+		Self { buffer, handle }
 	}
 }
 
@@ -152,7 +153,7 @@ impl phy::RxToken for RxToken {
 		F: FnOnce(&mut [u8]) -> smoltcp::Result<R>,
 	{
 		let result = f(self.buffer);
-		if unsafe { sys_rx_buffer_consumed().is_ok() } {
+		if unsafe { sys_rx_buffer_consumed(self.handle).is_ok() } {
 			result
 		} else {
 			Err(smoltcp::Error::Exhausted)
diff --git a/libhermit-rs b/libhermit-rs
index f5d1de1f9..fe9dd8be0 160000
--- a/libhermit-rs
+++ b/libhermit-rs
@@ -1 +1 @@
-Subproject commit f5d1de1f9a3cd2811cce53044b6b6639e7c76039
+Subproject commit fe9dd8be09b8e9961024252b370122b33b4e273c