kvm host kernel tuning on Ubuntu 15.04

kvm_host_sysctl

net.ipv6.conf.all.autoconf = 0
net.ipv6.conf.all.forwarding = 1
net.ipv6.conf.ovsbr0.forwarding = 1
net.ipv6.conf.default.forwarding = 1
net.ipv6.conf.all.accept_ra = 0
net.ipv4.ip_forward = 1
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv6.conf.all.use_tempaddr = 2
net.ipv6.conf.default.use_tempaddr = 2
net.core.optmem_max = 65535
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.rmem_default = 1048576
net.core.wmem_default = 1048576
net.ipv4.tcp_wmem = 10240 87380 16777216
net.ipv4.tcp_rmem = 10240 87380 16777216
net.ipv4.tcp_sack = 1
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_moderate_rcvbuf = 1
net.core.somaxconn = 4096
net.core.netdev_max_backlog = 4096
net.ipv4.tcp_congestion_control = htcp
vm.nr_hugepages = 512
vm.zone_reclaim_mode = 0
vm.vfs_cache_pressure = 50
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.ip_local_port_range = 18000    65535
net.ipv4.tcp_mtu_probing = 1
kernel.sched_min_granularity_ns = 10000000
kernel.sched_wakeup_granularity_ns = 15000000
vm.dirty_ratio = 10
vm.dirty_background_ratio = 5
vm.swappiness = 10
net.ipv4.conf.all.arp_filter = 1
vm.nr_hugepages = 25000
net.core.busy_poll = 50
net.core.busy_read = 50

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