---------- Forwarded message ---------- From: Jobin Raju George <jobin.rv@xxxxxxxxx> Date: Sun, Feb 9, 2014 at 11:39 PM Subject: Re: Using block device instead of character device for virtio-serial To: Stefan Hajnoczi <stefanha@xxxxxxxxx> Cc: kvm@xxxxxxxxxxxxxxx On Sun, Feb 9, 2014 at 2:42 PM, Stefan Hajnoczi <stefanha@xxxxxxxxx> wrote: > > On Thu, Feb 06, 2014 at 12:22:36PM +0530, Jobin Raju George wrote: > > I am trying to establish a communication mechanism between the guest > > and its host using virtio-serial. For this I am using the following to > > boot the VM: > > > > qemu-system-x86_64 -m 1024 \ > > -name ubuntu_vm \ > > -hda ubuntu \ > > -device virtio-serial \ > > -chardev socket,path=/tmp/virt_socket,server,nowait,id=virt_socket \ > > -device virtconsole,name=v_soc,chardev=virt_socket,name=ubuntu_vm_soc > > > > This creates a character device on the guest machine and a UNIX socket > > on the host machine. > > > > 1) Is there a way I can create sockets on the host as well as the guest? > > The syntax is documented on the QEMU man page. Try: > > -chardev socket,port=1234,server,nowait,id=virt_socket I did not try this out, but would this create a "socket" instead of a character device(/dev/hvc0) on the guest? > > > > 2) Is there a way I can create a block device for communication? > > > > I required a block device since the data that is to be transferred is > > huge and the frequency of the data transfer is quite high. > > Have you benchmarked virtio-serial or is this just a guess? I have not benchmarked virtio-serial but it seems to be intuitive that a block device would perform data transfer at a faster rate than a character device. I may be wrong, would be happy to be corrected. And yes, I would like to know how can I benchmark virtio-serial using a character device vs a TCP/IP socket data transfer vs virtio-serial using a block device. > > > Stefan -- Thanks and regards, Jobin Raju George Final Year, Information Technology College of Engineering Pune Alternate e-mail: georgejr10.it@xxxxxxxxxx -- Thanks and regards, Jobin Raju George Final Year, Information Technology College of Engineering Pune Alternate e-mail: georgejr10.it@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
