KVM Disk Performance with different configurations

Summary:

• Using a block device as vda and apply the virtio_blk driver is the fastest
  
• There is still a 5-10% penalty on both read and write.
  

Test Setup:

KVM: 8GB memory, 8 VCPU
Native: 8GB memory, 8CPU

Test command:

bonnie++ -s 24576 -x 10 -n 512

Disk Performance Xen/Kvm with LVM and Para-virt drivers

Summary:

• For KVM, there is a 5-10% penalty on both read and write.
  
• For XEN, the penalty is much larger for read/write, but seek time is better.
  

Test Setup:

Xen: 7GB memory, 8 VCPU
KVM: 8GB memory, 8 VCPU
Native: 8GB memory, 8CPU

Test command:

bonnie++ -s 24576 -x 10 -n 512