diff --git a/shadowsocks-libev/files/shadowsocks.conf b/shadowsocks-libev/files/shadowsocks.conf
index 070a876be..c9aedd2de 100644
--- a/shadowsocks-libev/files/shadowsocks.conf
+++ b/shadowsocks-libev/files/shadowsocks.conf
@@ -5,11 +5,11 @@ fs.file-max = 512000
 net.core.rmem_max = 16777216
 # max write buffer
 net.core.wmem_max = 16777216
-net.core.optmem_max = 33554432
+#net.core.optmem_max = 33554432
 # default read buffer
-#net.core.rmem_default = 16777216
+net.core.rmem_default = 16777216
 # default write buffer
-#net.core.wmem_default = 16777216
+net.core.wmem_default = 16777216
 # max processor input queue
 net.core.netdev_max_backlog = 8192
 # max backlog
@@ -40,7 +40,7 @@ net.ipv4.tcp_rmem = 4096 87380 16777216
 # TCP write buffer
 net.ipv4.tcp_wmem = 4096 87380 16777216
 # TCP buffer
-net.ipv4.tcp_mem = 8192000 8192000 8192000
+net.ipv4.tcp_mem = 1638400 1638400 1638400
 # UDP buffer
 net.ipv4.udp_mem = 4096 131072 67108864
 # turn off path MTU discovery