kvm guest kernel tuning CentOS7

kvm_guest_sysctl

# cat /etc/sysctl.d/kernel.conf 
net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_fin_timeout = 60
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv6.conf.all.accept_ra = 0
net.core.somaxconn = 4096
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 349520 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.core.netdev_max_backlog = 4096
net.ipv4.tcp_max_syn_backlog = 4096
vm.swappiness = 0
net.ipv4.tcp_congestion_control = htcp
kernel.perf_cpu_time_max_percent = 0