Il 09/08/2012 15:39, Stefan Priebe - Profihost AG ha scritto: >> scsi-generic would indeed incur some overhead because it does not do >> scatter/gather I/O directly, but scsi-hd/scsi-block do not have this >> overhead. In any case, that should be visible through the output of >> perf if it is significant. > > Thanks for your help and replies. I'm a little bit lost on all these > comments. So what to check / do next?
Try with the deadline scheduler, and run "perf top" in guest/host if the problems persist. Paolo
