On Mon, Aug 08, 2016 at 04:12:06PM +0000, Tim Bell wrote: > Any suggestions for how to tune KVM for SSDs on the hypervisor ? > We’re seeing a significant drop (50%) of IOPS for random write > from guest to host.
If you're using qcow2, you are doing random I/O and you have a sufficiently big virtual disk, chances are you need to increase the cache size: Take a look at this: https://blogs.igalia.com/berto/2015/12/17/improving-disk-io-performance-in-qemu-2-5-with-the-qcow2-l2-cache/ Berto
