Am 03.07.2012 15:20, schrieb Paolo Bonzini: > If the guest does not support flushes, we should run in writethrough mode. > The setting is temporary until the next reset, so that for example the > BIOS will run in writethrough mode while Linux will run with a writeback > cache. > > VIRTIO_BLK_F_FLUSH has been introduced in Linux 2.6.32 (in 2009) and > was backported to RHEL/CentOS 5.6 (in 2010). The Windows drivers have > two bugs, which I reported on the Red Hat Bugzilla as bugs 837321 and > 837324. With these patches they will suffer a performance hit but > gain correctness. > > Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
I generally like the idea for a default, but doesn't this override even an explicit cache=writeback? Are we sure that we want this? Kevin
