Re: BCM5708 performance issues

[Chris Wright <chrisw@sous-sol.org>]

* Pete Ashdown (pashdown@xmission.com) wrote:
> ProxMox guest:
> /usr/bin/kvm -monitor unix:/var/run/qemu-server/104.mon,server,nowait -vnc unix:/var/run/qemu-server/104.vnc,password -pidfile /var/run/qemu-server/104.pid -daemonize -usbdevice tablet -name UbuntuServer -smp sockets=2,cores=2 -nodefaults -boot menu=on -vga cirrus -tdf -k en-us -drive file=/var/lib/vz/images/104/vm-104-disk-2.raw,if=ide,index=3 -drive file=/var/lib/vz/images/104/vm-104-disk-1.raw,if=virtio,index=0,boot=on -m 1024 -net tap,vlan=0,ifname=vmtab104i0,script=/var/lib/qemu-server/bridge-vlan -net nic,vlan=0,model=virtio,macaddr=76:3F:1A:03:6D:6F
> 
> Ubuntu guest:
> /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 1024 -smp 1 -name ubutest -uuid c0537369-fffa-9680-2f29-2e0cc0406561 -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/ubutest.monitor,server,nowait -monitor chardev:monitor -boot c -drive file=/dev/vg/ubutest,if=virtio,index=0,boot=on -net nic,macaddr=52:54:00:35:11:f1,vlan=0,model=virtio,name=virtio.0 -net tap,fd=51,vlan=0,name=tap.0 -chardev pty,id=serial0 -serial chardev:serial0 -parallel none -usb -vnc 0.0.0.0

Not sure what userspace you are using, but you are probably not getting
any of the useful offload features set.  Checking "ethtool -k $ETH"
in the guest will verify that.

Try changing this:

-net nic,macaddr=52:54:00:35:11:f1,vlan=0,model=virtio,name=virtio.0 \
-net tap,fd=51,vlan=0,name=tap.0

to use newer syntax:

-netdev type=tap,id=netdev0
-device virtio-net-pci,mac=52:54:00:35:11:f1,netdev=netdev0

With just a 1Gb link, you should see line rate from guest via virtio.

thanks,
-chris