----- Original Message ----- > From: "Marcus White" <[email protected]> > To: [email protected] > Sent: Thursday, June 12, 2014 9:49:14 PM > Subject: Re: [ovirt-devel] virtio-scsi > > Hello, > Just a bump:) I am hoping this is the right list to ask the question... > > MW.
I don't think so. The oVirt project is build on top of libvirt and qemu. qeum developers should be able to answer these questions. I would try here: http://wiki.qemu.org/MailingLists > > On Fri, Jun 6, 2014 at 7:15 PM, Marcus White <[email protected]> > wrote: > > Hello > > I had some basic questions, was asking them on the kvm list but it > > probably makes more sense here:) > > > > The questions are about virtio-scsi. I would appreciate any help. > > > > 1. Is virtio-scsi via QEMU a zero copy operation from guest to disk? > > The vhost-LIO as I understand it is zero copy, wasnt sure about QEMU. > > With the VM and the QEMU thread part of the same process, it would be > > good to know the flow and where the copies occur, if they do. > > > > 2. When the block layer underneath QEMU(assuming the QEMU does talk to > > the block device and not sg, for example), if an error code comes in, > > is it converted to a SCSI response before being passed to the guest? > > > > 3. Are there any other performance tweaks that would help in both the > > QEMU case and the LIO case? > > > > Thanks in advance:) > > MW > _______________________________________________ > Devel mailing list > [email protected] > http://lists.ovirt.org/mailman/listinfo/devel > _______________________________________________ Devel mailing list [email protected] http://lists.ovirt.org/mailman/listinfo/devel
