On 10/03/13 20:24, Michael S. Tsirkin wrote:
On Fri, Mar 08, 2013 at 03:48:04PM +1100, Alexey Kardashevskiy wrote:
Michael,
Thanks for the fix.
There was another question which was lost in the thread.
I am testing virtio-net in two ways:
Old -net interface:
-net tap,ifname=tap0,script=qemu-ifup.sh \
-net nic,model=virtio,addr=0:0:0
(qemu) info network
hub 0
\ virtio-net-pci.0:
index=0,type=nic,model=virtio-net-pci,macaddr=52:54:00:12:34:56
\ tap.0:
index=0,type=tap,ifname=tap0,script=qemu-ifup.sh,downscript=/etc/qemu-ifdown
New -netdev interface:
-netdev tap,id=tapnet,ifname=tap0,script=qemu-ifup.sh \
-device virtio-net-pci,netdev=tapnet,addr=0.0
(qemu) info network
virtio-net-pci.0:
index=0,type=nic,model=virtio-net-pci,macaddr=52:54:00:12:34:56
\ tapnet:
index=0,type=tap,ifname=tap0,script=qemu-ifup.sh,downscript=/etc/qemu-ifdown
I get very different virtio0 device features and speed (70MB/s vs.
700MB/s). I guess somehow the "hub 0" is responsible but there is no
way to avoid it.
Is there any way to speed up the virtio-net using the old -net interface?
Not at the moment. Why do you want to use it?
It is not like I really want it, I was just trying to understand (now it is
more or less clear) why exactly "not" as the documentation is saying about
-net and -netdev as synonyms while they are not.
--
Alexey
