More improvements

Cargo.toml

@@ -12,6 +12,7 @@ log = "0.3"
 epoll = "0.2"
 signal = "0.1"
 nix = "*"
+libc = "*"
 libsodium-sys = {version = "0.0.9", optional = true}
 
 [build-dependencies]

performance.md

@@ -41,10 +41,10 @@ $> iperf -c 10.2.1.2 -t 60
 
 **Results:**
   * Throughput without VpnCloud: 938 Mbits/sec
-  * Throughput via VpnCloud (MTU=1400): 363 Mbits/sec
+  * Throughput via VpnCloud (MTU=1400): 461 Mbits/sec
   * CPU usage for VpnCloud (MTU=1400): maxed out at ~105% of one core
-  * Throughput via VpnCloud (MTU=16384): 946 Mbits/sec (no idea why this is higher)
-  * CPU usage for VpnCloud (MTU=16384): ~73% of one core
+  * Throughput via VpnCloud (MTU=16384): 949 Mbits/sec (no idea why this is higher)
+  * CPU usage for VpnCloud (MTU=16384): ~68% of one core
 
 
 ### Test 2: Unencrypted ping
@@ -86,6 +86,6 @@ SIZE: 1400 bytes
 
 ### Conclusion
 
-* VpnCloud achieves about 360 MBit/s with default MTU settings.
+* VpnCloud achieves about 460 MBit/s with default MTU settings.
 * At increased MTU, VpnCloud is able to saturate a Gigabit link.
 * VpnCloud adds about 120µs to the round trip times, i.e. 60µs latency increase.

src/benches.rs

@@ -1,6 +1,6 @@
 use test::Bencher;
 
-use time::{SteadyTime, Duration};
+use time::Duration;
 
 use std::str::FromStr;
 use std::net::ToSocketAddrs;
@@ -61,7 +61,8 @@ fn switch_lookup(b: &mut Bencher) {
 
 #[bench]
 fn ethernet_parse(b: &mut Bencher) {
-    let data = [0; 1500];
+    let mut data = [0; 1500];
+    data[5] = 45;
     b.iter(|| {
         Frame::parse(&data).unwrap()
     })

src/cloud.rs

@@ -7,19 +7,20 @@ use std::fmt;
 use std::os::unix::io::AsRawFd;
 use std::marker::PhantomData;
 
-use time::{Duration, SteadyTime, precise_time_ns};
 use epoll;
 use nix::sys::signal::{SIGTERM, SIGQUIT, SIGINT};
 use signal::trap::Trap;
+use time::SteadyTime;
 
 use super::types::{Table, Protocol, Range, Error, NetworkId};
 use super::device::Device;
 use super::udpmessage::{encode, decode, Options, Message};
 use super::crypto::Crypto;
+use super::util::{now, Time, Duration, time_rand};
 
 struct PeerList {
     timeout: Duration,
-    peers: HashMap<SocketAddr, SteadyTime>
+    peers: HashMap<SocketAddr, Time>
 }
 
 impl PeerList {
@@ -28,7 +29,7 @@ impl PeerList {
     }
 
     fn timeout(&mut self) -> Vec<SocketAddr> {
-        let now = SteadyTime::now();
+        let now = now();
         let mut del: Vec<SocketAddr> = Vec::new();
         for (&addr, &timeout) in &self.peers {
             if timeout < now {
@@ -49,7 +50,7 @@ impl PeerList {
 
     #[inline]
     fn add(&mut self, addr: &SocketAddr) {
-        if self.peers.insert(*addr, SteadyTime::now()+self.timeout).is_none() {
+        if self.peers.insert(*addr, now()+self.timeout as Time).is_none() {
             info!("New peer: {:?}", addr);
         }
     }
@@ -96,10 +97,10 @@ pub struct GenericCloud<P: Protocol> {
     device: Device,
     options: Options,
     crypto: Crypto,
-    next_peerlist: SteadyTime,
+    next_peerlist: Time,
     update_freq: Duration,
     buffer_out: [u8; 64*1024],
-    next_housekeep: SteadyTime,
+    next_housekeep: Time,
     _dummy_p: PhantomData<P>,
 }
 
@@ -124,10 +125,10 @@ impl<P: Protocol> GenericCloud<P> {
             device: device,
             options: options,
             crypto: crypto,
-            next_peerlist: SteadyTime::now(),
+            next_peerlist: now(),
             update_freq: peer_timeout/2,
             buffer_out: [0; 64*1024],
-            next_housekeep: SteadyTime::now(),
+            next_housekeep: now(),
             _dummy_p: PhantomData,
         }
     }
@@ -169,7 +170,7 @@ impl<P: Protocol> GenericCloud<P> {
     fn housekeep(&mut self) -> Result<(), Error> {
         self.peers.timeout();
         self.table.housekeep();
-        if self.next_peerlist <= SteadyTime::now() {
+        if self.next_peerlist <= now() {
             debug!("Send peer list to all peers");
             let mut peer_num = self.peers.len();
             if peer_num > 10 {
@@ -178,12 +179,12 @@ impl<P: Protocol> GenericCloud<P> {
                     peer_num = 10;
                 }
             }
-            let peers = self.peers.subset(peer_num, precise_time_ns() as u32);
+            let peers = self.peers.subset(peer_num, time_rand() as u32);
             let msg = Message::Peers(peers);
             for addr in &self.peers.as_vec() {
                 try!(self.send_msg(addr, &msg));
             }
-            self.next_peerlist = SteadyTime::now() + self.update_freq;
+            self.next_peerlist = now() + self.update_freq as Time;
         }
         for addr in self.reconnect_peers.clone() {
             try!(self.connect(addr, false));
@@ -272,6 +273,7 @@ impl<P: Protocol> GenericCloud<P> {
     }
 
     pub fn run(&mut self) {
+        let dummy_time = SteadyTime::now();
         let trap = Trap::trap(&[SIGINT, SIGTERM, SIGQUIT]);
         let epoll_handle = try_fail!(epoll::create1(0), "Failed to create epoll handle: {}");
         let socket_fd = self.socket.as_raw_fd();
@@ -284,10 +286,6 @@ impl<P: Protocol> GenericCloud<P> {
         let mut buffer = [0; 64*1024];
         loop {
             let count = try_fail!(epoll::wait(epoll_handle, &mut events, 1000), "Epoll wait failed: {}");
-            // Check for signals
-            if trap.wait(SteadyTime::now()).is_some() {
-                break;
-            }
             // Process events
             for i in 0..count {
                 match &events[i as usize].data {
@@ -308,13 +306,17 @@ impl<P: Protocol> GenericCloud<P> {
                     _ => unreachable!()
                 }
             }
-            // Do the housekeeping
-            if self.next_housekeep < SteadyTime::now() {
+            if self.next_housekeep < now() {
+                // Check for signals
+                if trap.wait(dummy_time).is_some() {
+                    break;
+                }
+                // Do the housekeeping
                 match self.housekeep() {
                     Ok(_) => (),
                     Err(e) => error!("Error: {:?}", e)
                 }
-                self.next_housekeep = SteadyTime::now() + Duration::seconds(1)
+                self.next_housekeep = now() + 1
             }
         }
         info!("Shutting down...");

src/ethernet.rs

@@ -3,9 +3,7 @@ use std::net::SocketAddr;
 use std::collections::HashMap;
 
 use super::types::{Error, Table, Protocol, Address};
-
-use time::{Duration, SteadyTime};
-
+use super::util::{now, Time, Duration};
 
 #[derive(PartialEq)]
 pub struct Frame;
@@ -49,7 +47,7 @@ impl Protocol for Frame {
 
 struct SwitchTableValue {
     address: SocketAddr,
-    timeout: SteadyTime
+    timeout: Time
 }
 
 pub struct SwitchTable {
@@ -66,7 +64,7 @@ impl SwitchTable {
 
 impl Table for SwitchTable {
     fn housekeep(&mut self) {
-        let now = SteadyTime::now();
+        let now = now();
         let mut del: Vec<Address> = Vec::new();
         for (key, val) in &self.table {
             if val.timeout < now {
@@ -82,7 +80,7 @@ impl Table for SwitchTable {
 
     #[inline]
     fn learn(&mut self, key: Address, _prefix_len: Option<u8>, addr: SocketAddr) {
-        let value = SwitchTableValue{address: addr, timeout: SteadyTime::now()+self.timeout};
+        let value = SwitchTableValue{address: addr, timeout: now()+self.timeout as Time};
         if self.table.insert(key.clone(), value).is_none() {
             info!("Learned address {:?} => {}", key, addr);
         }

src/main.rs

@@ -6,6 +6,7 @@ extern crate rustc_serialize;
 extern crate epoll;
 extern crate signal;
 extern crate nix;
+extern crate libc;
 #[cfg(feature = "crypto")] extern crate libsodium_sys;
 #[cfg(feature = "bench")] extern crate test;
 
@@ -19,7 +20,6 @@ mod cloud;
 mod device;
 #[cfg(feature = "bench")] mod benches;
 
-use time::Duration;
 use docopt::Docopt;
 
 use std::hash::{Hash, SipHasher, Hasher};
@@ -33,6 +33,7 @@ use types::{Error, Mode, Type, Range, Table, Protocol};
 use cloud::GenericCloud;
 use udpmessage::VERSION;
 use crypto::Crypto;
+use util::Duration;
 
 
 struct SimpleLogger;
@@ -63,8 +64,8 @@ struct Args {
     flag_listen: String,
     flag_network_id: Option<String>,
     flag_connect: Vec<String>,
-    flag_peer_timeout: usize,
-    flag_dst_timeout: usize,
+    flag_peer_timeout: Duration,
+    flag_dst_timeout: Duration,
     flag_verbose: bool,
     flag_quiet: bool,
     flag_ifup: Option<String>,
@@ -93,8 +94,8 @@ fn run<T: Protocol> (args: Args) {
     for s in args.flag_subnet {
         ranges.push(try_fail!(Range::from_str(&s), "Invalid subnet format: {} ({})", s));
     }
-    let dst_timeout = Duration::seconds(args.flag_dst_timeout as i64);
-    let peer_timeout = Duration::seconds(args.flag_peer_timeout as i64);
+    let dst_timeout = args.flag_dst_timeout;
+    let peer_timeout = args.flag_peer_timeout;
     let (learning, broadcasting, table): (bool, bool, Box<Table>) = match args.flag_mode {
         Mode::Normal => match args.flag_type {
             Type::Tap => (true, true, Box::new(SwitchTable::new(dst_timeout))),

src/util.rs

@@ -1,4 +1,23 @@
 use std::{mem, slice};
+use libc;
+
+pub type Duration = u32;
+pub type Time = i64;
+
+#[inline]
+pub fn now() -> Time {
+    let mut tv = libc::timespec { tv_sec: 0, tv_nsec: 0 };
+    unsafe { libc::clock_gettime(6, &mut tv); }
+    tv.tv_sec
+}
+
+#[inline]
+pub fn time_rand() -> i64 {
+    let mut tv = libc::timespec { tv_sec: 0, tv_nsec: 0 };
+    unsafe { libc::clock_gettime(libc::CLOCK_MONOTONIC, &mut tv); }
+    tv.tv_sec ^ tv.tv_nsec
+}
+
 
 #[inline(always)]
 pub unsafe fn as_bytes<T>(obj: &T) -> &[u8] {