Paul Brook wrote:
A concern here is the growing size of the virtio-net I/O port space
config. This series brings it up to 256 bytes with PCI resource
rounding. The VLAN filter bitmap would increase that by another 512
bytes, making it 1kB and limiting us to something less than 64 such
devices per guest. Is anyone worried? Should filter tables live in
MMIO space for virtio devices? I'll send out the guest side patches for
virtio-net in a separate thread. Thanks,
This is one reason why IO ports are a reallybad idea. Use memory mapped
register spaces like any other sane system and you won't have a problem.
IO ports are much faster for notification than MMIO in KVM which is why
the space is currently IO ports. It was never meant to hold very large
amounts of data.
Regards,
Anthony Liguori
Paul
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