On 01/09/2013 06:25 PM, Paolo Bonzini wrote: > But why is it useful to force-disable writeback caching? Do you have > any performance numbers?
This is not related to performance. What I want is to allow users to choose Sheepdog cache mode (writethrough/writeback/directio) from cache=xxx. Obviously writeback mode show much better write performance over writethrough cache in Sheepdog. NOTE: writethrough cache in Sheepdog is a readonly cache which is always consistent with cluster data thus need no flush at all. This is to boost read performance for read intensive Guest over Sheepdog iamges. Thanks, Yuan
