[fedora-virt] virtio block driver performance versus ide
Dale Bewley
dlbewley at lib.ucdavis.edu
Thu Oct 15 19:50:25 UTC 2009
I assumed the virtio block driver to be faster for a kvm guest than ide,
but I'm seeing quite the opposite. Is this expected?
I normally create guests with a wrapper script around virt-install which
creates guests configured to use IDE disks:
f11-db1.xml- <emulator>/usr/bin/qemu-kvm</emulator>
f11-db1.xml: <disk type='file' device='disk'>
f11-db1.xml- <source file='/var/lib/libvirt/images//f11-db1.img'/>
f11-db1.xml- <target dev='hda' bus='ide'/>
f11-db1.xml: </disk>
I am currently creating a guest with the virt-manager wizard which
apparently uses virtio by default:
f11-archivist.xml- <emulator>/usr/bin/qemu-kvm</emulator>
f11-archivist.xml: <disk type='file' device='disk'>
f11-archivist.xml- <source
file='/var/lib/libvirt/images//f11-archivist.img'/>
f11-archivist.xml- <target dev='vda' bus='virtio'/>
f11-archivist.xml: </disk>
The filesystem formatting and installation are going very very slowly.
Host is 2.6.29.6-213.fc11.x86_64 4x quad core. Guests are also fc11
x86_64.
BTW, I've updated to virt-manager-0.7.0-7, libvirt-0.6.2-18,
qemu-kvm-0.10.6-6, and kernel-2.6.30.8-64 just before creating this
guest but have not restarted libvirtd or rebooted the host.
--
Dale Bewley - Unix Administrator - Shields Library - UC Davis
GPG: 0xB098A0F3 0D5A 9AEB 43F4 F84C 7EFD 1753 064D 2583 B098 A0F3
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