[fedora-virt] Has something happened to virtio cache modes?

[Tom Horsley]

Back around fedora 16 I tried all the different virtio
cache modes and experimentally discovered that
cache=none was nearly infinitely faster than cache=default
and cache=writeback was even a little faster than cache=none.
So I set all my VMs to cache=writeback.

I've been copying my virtual machine defs to each new
fedora since then, but now it seems to be dog slow
with disk IO again.

I'm planning to experiment with different settings again,
but I have to wait for my Windows XP virtual machine
to finish doing a windows update which may take all night
at the rate it is writing to disk :-(.

Just thought I'd ask if there is some known difference
in the virtio modes in fedora 18?