Am 23.07.2015 um 10:08 schrieb wim torfs: > > > On 07/22/2015 07:16 PM, Oleksij Rempel wrote: >> Am 22.07.2015 um 18:37 schrieb Rolf Anderegg: >>> >>> On 16/07/15 13:54, Oleksij Rempel wrote: >>>> Am 13.07.2015 um 13:52 schrieb Rolf Anderegg: >>>>> >>>>> I suspect that there are bandwidth/speed issues when dealing with USB >>>>> adapters, but that does not inherently mean that the connection is >>>>> prone >>>>> to drop, right? Doesn't that mean that I am leaking packages somewhere >>>>> along the way? What else could I be looking for? >>>> >>>> The packages can drop if you will do channel scan. STA mode need some >>>> seconds to complete channel scan. It means AP will be all the time >>>> unavailable. >>> >>> Ok, that may be. Then again why am I not experiencing the same >>> connection drop on my ath5k setup? Because the channel scan is more >>> likely to be completed in due time? >> >> Yes, channel scantime on usb device is match longer then on pci. >> > > May I ask for the reason it takes a longer time to complete the scanning > on a USB device compared to a PCI device? I assume the internals of an > ath9k PCI device is similar as that of an ath9k_htc USB device, so is it > purely the bus speed that affects this time? Or is the USB device a > smaller version of the chipset on the PCI device and therefore with a > lower speed due to power concerns? > > If it is due to the bus speed, would it be possible to decouple the > scanning process from the bus, that is, I assume that the hardware > performs all the necessary channel switching and channel sensing, so why > not allow the hardware to gather such information and transfer the > results in a single burst to the host over the USB bus? Or is the > channel switching controlled by the host and it takes a lot of time due > to the duration of transmitting the channel switching commands to the > USB device? Well, it is about development time vs scan time: do as match as possible with one code base or develop two different code bases. -- Regards, Oleksij
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