>I can't say anything about the kernel version making things worse. At >least for the qemu-kvm version, you should be using -device and -netdev >instead of -net nic -net tap (see >*http://git.qemu.org/qemu.git/tree/docs/qdev-device-use.txt since it's >not in the 0.12 tree).* Thanks for your suggestion Brian I was not doing this correctly. After changing to -device and -netdev I did get a significant performance increase although overall performance is still much worse than what I was getting in the 2.3.31.5 kernel with version 11. Below is part of my startup script. Any chance you notice anything else wrong? Before your suggestion (what was working well with version 11 & 2.6.31): modprobe kvm modprobe kvm_intel modprobe tun echo -e "Setting up bridge device br0" "\r" brctl addbr br0 ifconfig br0 192.168.100.254 netmask 255.255.255.0 up brctl addif br0 eth7 ifconfig eth7 down ifconfig eth7 0.0.0.0 for ((i=0; i < NUM_OF_DEVICES ; i++)); do echo -e "Setting up " "\r" tunctl -b -g ${KVMNET_GID} -t kvmnet$i brctl addif br0 kvmnet$i ifconfig kvmnet$i up 0.0.0.0 promisc done echo "1" > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -o eth7 -j MASQUERADE for ((i=0; i < NUM_OF_DEVICES ; i++)); do echo -e "Creating Virtual disk" $i "\r" qemu-img create -f qcow2 vdisk_$i.img $VDISK_SIZE echo -e "Starting Virtual Machine" $i "\r" /root/bin/qemu-system-x86_64 -cpu host -drive file=./vdisk_$i.img,if=virtio,boot=on -cdrom ./$2 -boot d \ -net nic,model=virtio,macaddr=52:54:00:12:34:3$i \ -net tap,ifname=kvmnet$i,script=no \ -m 1024 \ -smp 2 \ -usb \ -usbdevice tablet \ -localtime \ -daemonize \ -vga std After changing to -device and -netdev(working better with the latest stuff but still much worse than 2.6.31): modprobe kvm modprobe kvm_intel modprobe tun echo -e "Setting up bridge device br0" "\r" brctl addbr br0 ifconfig br0 192.168.100.254 netmask 255.255.255.0 up brctl addif br0 eth7 ifconfig eth7 down ifconfig eth7 0.0.0.0 for ((i=0; i < NUM_OF_DEVICES ; i++)); do echo -e "Setting up " "\r" tunctl -b -g ${KVMNET_GID} -t kvmnet$i brctl addif br0 kvmnet$i ifconfig kvmnet$i up 0.0.0.0 promisc done echo "1" > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -o eth7 -j MASQUERADE for ((i=0; i < NUM_OF_DEVICES ; i++)); do echo -e "Creating Virtual disk" $i "\r" qemu-img create -f qcow2 vdisk_$i.img $VDISK_SIZE echo -e "Starting Virtual Machine" $i "\r" /root/bin/qemu-system-x86_64 -cpu host -drive file=./vdisk_$i.img,if=virtio,boot=on -cdrom ./$2 -boot d \ -netdev type=tap,id=tap.0,script=no,ifname=kvmnet$i \ -device virtio-net-pci,netdev=tap.0,mac=52:54:00:12:34:3$i \ -m 1024 \ -smp 2 \ -usb \ -usbdevice tablet \ -localtime \ -daemonize \ -vga std >Vhost-net is probably your best bet for maximizing throughput. You might >try a separate post just for the vhost error if nobody chimes in about >it here. I will do that. Thanks again for the input! --Matt -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
