Hi all, I'm testing kvm-guest performance. My testing model has 1 host (kvm) and 1 storage (openfiler). Connecting between kvm and openfiler is multipath. KVM----(iSCSI-multipath)----Openfiler - Multipath: 3 path x 1 gigabit. - Openfiler: 8 hard-drive SATA raid 5 - KVM: Centos-6.0, RAM 8GB I create 1 iSCSI-targer on Openfiler and from kvm connect to it. This storage-iSCSI is formated in ext4 and mount to /mnt On kvm, i only create 1 vm (RAM 3GB, install Centos-6.0) I begin test as follows: On kvm i run command # free -m total used free shared buffers cached Mem: 7862 7625 237 0 2 3461 # dd if=/dev/zero of=/mnt/test bs=2M count=7862 7862+0 records in 7862+0 records out 16487809024 bytes (16 GB) copied, 62.843 s, 262 MB/s On vm i run command # free -m total used free shared buffers cached Mem: 2945 2848 96 # dd if=/dev/zero of=/test bs=2M count=2945 2945+0 records in 2945+0 records out 6176112640 bytes (6.2 GB) copied, 37.3925 s, 165 MB/s Everyone can help me why speed i/o on vm (Guest) is lower than on kvm. Thanks!Best regards. Nguyen, -- 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
