Re: [Qemu-devel] virtio-scsi vs. virtio-blk

[Stefan Priebe - Profihost AG]

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.

Stefan