Il 09/08/2012 15:52, Stefan Priebe - Profihost AG ha scritto: > > Am 09.08.2012 15:42, schrieb Paolo Bonzini: >> 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. > > Thanks will do so. Right now i'm getting virtio_net virtio2: output:id 1 > is not a head! > > and then network is down.
Please disable vhost, or ensure that you have the patch that Stefan pointed you to. Paolo
