tweak some sysctl values for better performance

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15129 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/etc/sysctl.conf

@@ -9,6 +9,9 @@ net.ipv4.tcp_fin_timeout=30
 net.ipv4.tcp_keepalive_time=120
 net.ipv4.tcp_syncookies=1
 net.ipv4.tcp_timestamps=0
+net.core.netdev_max_backlog=30
+net.netfilter.nf_conntrack_checksum=0
+net.ipv4.netfilter.ip_conntrack_checksum=0
 net.ipv4.netfilter.ip_conntrack_max=16384
 net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=3600
 net.ipv4.netfilter.ip_conntrack_udp_timeout=60