the below results are the averages of the times returned by dd if=/dev/zero of=test bs=512M count=2 5 times 7.607s 134.6 MiB/s raid5 + lvm + ext3 29.69s 34.5 MiB/s raid5 + lvm + drbd + ext3 36.28s 28.2 MiB/s raid5 + lvm + kvm + ext3 80.05s 12.8 MiB/s raid5 + lvm + drbd + kvm + ext3 which leads me to believe the major cause here is that drbd and kvm are not working well together, I'm not suprised by the major performance drop off when adding drbd, however I am moderately surprised by seeing the same thing when adding kvm. KVM-84 was used in the tests As a note the last test using both drbd and kvm resulted in a response "Clocksource tsc unstable (delta = 4691311571 ns)", making me wonder if the timings were negatively affect by clock skew maybe? -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
