On Thu, 2010-02-18 at 17:28 -0800, Sam Leffler wrote: > Depends on your definition of channel. For MIMO devices you can have > NF per RX chain. Indeed. > NF is typically measured infrequently but the frequency is inherently > hw-specific. Right. > Given radiotap is inherently packet-oriented there was little choice > but to package noise in the way it is. If you include it only when it > changes but then you lose the ability to interpret each record > independently. Given this value is 8-bits I don't see the big deal. > Fixing drivers to include useful data seems more important. Ah. No, this is not really what I'm debating. For radiotap, we can include the value in every packet, no matter when it was measured. But for actual measurement API etc. I think we need to take more care and not require the driver to fill the status per packet. We can handle that, for radiotap, in the stack; actually getting noise information out of the card into userspace _when requested_ should have more of an up-to-date guarantee (or just not give a value) though, I think. I'd be happy to make the stack fill radiotap with whatever value we have, but the way we report it now from the driver to the stack seems completely bogus. johannes -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
