On 10/13/2010 05:32 PM, Anjali Kulkarni wrote:


Using the legacy way of starting up NICs, I am hitting a limitation after 29
NICs ie no more than 29 are detected (that's because of the 32 PCI slot
limit on a single bus- 3 are already taken up)
I had initially increased the MAX_NICS to 48, just on my tree, to get to
more, but ofcource that wont work.
Is there any way to go beyond 29 NICs the legacy way?  What is the maximum
that can be supported by the qdev mothod?

I got up to 104 without trying very hard using the following script:

for slot in 5 6 7 8 9 10 11 12 13 14 15 16 17; do
for fn in 0 1 2 3 4 5 6 7; do
    args="$args -netdev user,id=eth${slot}_${fn}"
args="$args -device virtio-net-pci,addr=${slot}.${fn},netdev=eth${slot}_${fn},multifunction=on,romfile="

x86_64-softmmu/qemu-system-x86_64 -hda ~/images/linux.img ${args} -enable-kvm

The key is to make the virtio-net devices multifunction and to fill out all 8 functions for each slot.


Anthony Liguori


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