diff --git a/benchmark/http.sh b/benchmark/http.sh
index 40d0c714c2..9a844a9004 100755
--- a/benchmark/http.sh
+++ b/benchmark/http.sh
@@ -1,12 +1,43 @@
 #!/bin/bash
 cd "$(dirname "$(dirname $0)")"
-sudo sysctl -w net.inet.ip.portrange.first=12000
-sudo sysctl -w net.inet.tcp.msl=1000
-sudo sysctl -w kern.maxfiles=1000000 kern.maxfilesperproc=1000000
+
+if type sysctl &>/dev/null; then
+  # darwin and linux
+  sudo sysctl -w net.ipv4.ip_local_port_range="12000 65535"
+  sudo sysctl -w net.inet.ip.portrange.first=12000
+  sudo sysctl -w net.inet.tcp.msl=1000
+  sudo sysctl -w kern.maxfiles=1000000 kern.maxfilesperproc=1000000
+elif type /usr/sbin/ndd &>/dev/null; then
+  # sunos
+  /usr/sbin/ndd -set /dev/tcp tcp_smallest_anon_port 12000
+  /usr/sbin/ndd -set /dev/tcp tcp_largest_anon_port 65535
+  /usr/sbin/ndd -set /dev/tcp tcp_max_buf 2097152
+  /usr/sbin/ndd -set /dev/tcp tcp_xmit_hiwat 1048576
+  /usr/sbin/ndd -set /dev/tcp tcp_recv_hiwat 1048576
+fi
+
 ulimit -n 100000
 
-./node benchmark/http_simple.js || exit 1 &
+k=${KEEPALIVE}
+if [ "$k" = "no" ]; then
+  k=""
+else
+  k="-k"
+fi
+node=${NODE:-./node}
+
+$node benchmark/http_simple.js &
+npid=$!
+
 sleep 1
 
-ab -n 30000 -c 100 http://127.0.0.1:8000/${TYPE:-bytes}/${LENGTH:-1024} | grep Req
-killall node
+if [ "$k" = "-k" ]; then
+  echo "using keepalive"
+fi
+
+for i in a a a a a a a a a a a a a a a a a a a a; do
+  ab $k -t 10 -c 100 http://127.0.0.1:8000/${TYPE:-bytes}/${LENGTH:-1024} \
+    2>&1 | grep Req | egrep -o '[0-9\.]+'
+done
+
+kill $npid