The default is cache=writethrough in the interest of data integrity.
I don't think we want to differ from what upstream KVM provides, on
this point.
Note that the manpage says:
Some block drivers perform badly with cache=writethrough, most
notably, qcow2. If performance is more important than correctness,
cache=writeback should be used with qcow2.
If you believe that this default should be changed, please have that
discussion on the upstream kvm and qemu mailing lists. I believe that
upstream has discussed this and has chosen data integrity over
performance as the default.
Thanks,
:-Dustin
--
LVM backed drives should default to cache='none'
https://bugs.launchpad.net/bugs/568445
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