toggle writing method to nodelay for responsivness

snmplog: only format the log file name, not the whole path

README.md

@@ -23,33 +23,39 @@
 
 > *kcptun maintains a single website — [github.com/xtaci/kcptun](https://github.com/xtaci/kcptun). Any websites other than [github.com/xtaci/kcptun](https://github.com/xtaci/kcptun) are not endorsed by xtaci. kcptun won't publish anything on any social media.*
 
-> *KCP communication group: 364933586 (QQ group number), KCP integration, tuning, network transmission and related technical discussions.*
+> *KCP discussion QQ group: 364933586, KCP integration, tuning, network transmission and related technical discussions.*
 
 ### QuickStart
 
-Increase number of open files on your server, as:
+Increase the number of open files on your server, as:
 
 `ulimit -n 65535`, or write it in `~/.bashrc`.
 
-Download precompiled [Releases](https://github.com/xtaci/kcptun/releases).
+Increase the OS UDP buffers to improve performance, as:
+
+```
+net.core.rmem_max=26214400
+net.core.rmem_default=26214400
+```
+
+Download a corresponding precompiled [Releases](https://github.com/xtaci/kcptun/releases).
 
 ```
 KCP Client: ./client_darwin_amd64 -r "KCP_SERVER_IP:4000" -l ":8388" -mode fast2
 KCP Server: ./server_linux_amd64 -t "TARGET_IP:8388" -l ":4000" -mode fast2
 ```
-The above commands will establish port forwarding for 8388/tcp as:
+The above commands will establish port forwarding channel for 8388/tcp as:
 
 > Application -> **KCP Client(8388/tcp) -> KCP Server(4000/udp)** -> Target Server(8388/tcp) 
 
-Tunnels the original connection:
+which tunnels the original connection:
 
 > Application -> Target Server(8388/tcp) 
 
 ### Install from source
 
 ```
-$go get -u github.com/xtaci/kcptun/client
-$go get -u github.com/xtaci/kcptun/server
+$go get -u github.com/xtaci/kcptun/...
 ```
 
 All precompiled releases are genereated from `build-release.sh` script.
@@ -207,7 +213,7 @@ BenchmarkSalsa20-4     	  300000	      4998 ns/op
 
 #### Memory Control
 
-Routers, mobile devices are sensitive to memory consumption; by setting GOGC environment(eg: GOGC=20) will lower memory consumption.
+Routers, mobile devices are susceptible to memory consumption; by setting GOGC environment(eg: GOGC=20) will make the garbage collector to recycle faster.
 Reference: https://blog.golang.org/go15gc
 
 #### Compression

build-release.sh

@@ -47,10 +47,10 @@ tar -zcf kcptun-linux-arm-$VERSION.tar.gz client_linux_arm* server_linux_arm*
 $sum kcptun-linux-arm-$VERSION.tar.gz
 
 #MIPS32LE
-env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_mipsle github.com/xtaci/kcptun/client
-env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_mipsle github.com/xtaci/kcptun/server
-env CGO_ENABLED=0 GOOS=linux GOARCH=mips go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_mips github.com/xtaci/kcptun/client
-env CGO_ENABLED=0 GOOS=linux GOARCH=mips go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_mips github.com/xtaci/kcptun/server
+env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_mipsle github.com/xtaci/kcptun/client
+env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_mipsle github.com/xtaci/kcptun/server
+env CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_mips github.com/xtaci/kcptun/client
+env CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_mips github.com/xtaci/kcptun/server
 
 if $UPX; then upx -9 client_linux_mips* server_linux_mips*;fi
 tar -zcf kcptun-linux-mipsle-$VERSION.tar.gz client_linux_mipsle server_linux_mipsle

client/main.go

@@ -18,6 +18,8 @@ import (
 	"github.com/urfave/cli"
 	kcp "github.com/xtaci/kcp-go"
 	"github.com/xtaci/smux"
+
+	"path/filepath"
 )
 
 var (
@@ -294,6 +296,7 @@ func main() {
 		listener, err := net.ListenTCP("tcp", addr)
 		checkError(err)
 
+		log.Println("initiating key derivation")
 		pass := pbkdf2.Key([]byte(config.Key), []byte(SALT), 4096, 32, sha1.New)
 		var block kcp.BlockCrypt
 		switch config.Crypt {
@@ -355,7 +358,7 @@ func main() {
 				return nil, errors.Wrap(err, "createConn()")
 			}
 			kcpconn.SetStreamMode(true)
-			kcpconn.SetWriteDelay(true)
+			kcpconn.SetWriteDelay(false)
 			kcpconn.SetNoDelay(config.NoDelay, config.Interval, config.Resend, config.NoCongestion)
 			kcpconn.SetWindowSize(config.SndWnd, config.RcvWnd)
 			kcpconn.SetMtu(config.MTU)
@@ -476,7 +479,10 @@ func snmpLogger(path string, interval int) {
 	for {
 		select {
 		case <-ticker.C:
-			f, err := os.OpenFile(time.Now().Format(path), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+			// split path into dirname and filename
+			logdir, logfile := filepath.Split(path)
+			// only format logfile
+			f, err := os.OpenFile(logdir+time.Now().Format(logfile), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
 			if err != nil {
 				log.Println(err)
 				return

server/main.go

@@ -15,6 +15,8 @@ import (
 
 	"golang.org/x/crypto/pbkdf2"
 
+	"path/filepath"
+
 	"github.com/golang/snappy"
 	"github.com/urfave/cli"
 	kcp "github.com/xtaci/kcp-go"
@@ -302,6 +304,7 @@ func main() {
 		}
 
 		log.Println("version:", VERSION)
+		log.Println("initiating key derivation")
 		pass := pbkdf2.Key([]byte(config.Key), []byte(SALT), 4096, 32, sha1.New)
 		var block kcp.BlockCrypt
 		switch config.Crypt {
@@ -372,7 +375,7 @@ func main() {
 			if conn, err := lis.AcceptKCP(); err == nil {
 				log.Println("remote address:", conn.RemoteAddr())
 				conn.SetStreamMode(true)
-				conn.SetWriteDelay(true)
+				conn.SetWriteDelay(false)
 				conn.SetNoDelay(config.NoDelay, config.Interval, config.Resend, config.NoCongestion)
 				conn.SetMtu(config.MTU)
 				conn.SetWindowSize(config.SndWnd, config.RcvWnd)
@@ -400,7 +403,10 @@ func snmpLogger(path string, interval int) {
 	for {
 		select {
 		case <-ticker.C:
-			f, err := os.OpenFile(time.Now().Format(path), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+			// split path into dirname and filename
+			logdir, logfile := filepath.Split(path)
+			// only format logfile
+			f, err := os.OpenFile(logdir+time.Now().Format(logfile), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
 			if err != nil {
 				log.Println(err)
 				return