> Am 13.07.2016 um 12:48 schrieb Peter N. M. Hansteen <[email protected]>: > > On Wed, Jul 13, 2016 at 12:39:14PM +0200, Christian R????ner wrote: >>> Hello, you should use virtio drivers for the disk in KVM. >> >> I already use virtio ;-) But there is no need for the BSD kernel to do further >> scheduling. > > I'm not at all there is a knob to twiddle here, but if there is, will you > realistically see any difference in performance (assuming this is about > shaving cycles off)?
I had done lots of performance tests in the past and the more VMs you are running on a server, the more you will see latencies in disk IO. I found out that turning off the schedulers and also setting swappiness to a very low value, brings back performance. Christian
