This is going to be fairly common with a lot of wireless chipsets. High traffic (approaching the theoretical limit of the wireless medium) is going to require the host processor to do more work because most of the driver is actually implemented in software. For example, on my laptop I have a prism2 chipset (which does 802.11b at 11Mbps), when I do local transfers between machines on the network, it's not uncommon to see load and CPU usage spike.
If this is the sort of thing you're seeing, then I don't think it's really a bug, it's just a necessary evil of wireless chipsets whose drivers load down the CPU. -- bcm43xx driver increase cpu usage https://launchpad.net/bugs/62190 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
