Please use cache=none for disks. The default cache setting is "writethrough" which means the image file is opened with O_DSYNC. Every single write is flushed to disk.
Modern guests run much faster using cache=none and data is safe as long as the guest issues cache flushes when appropriate (which modern guests/apps do). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1035921 Title: odd IO/load behaviour running debian installer guest To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1035921/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
