Re: usb2 and usb3 ports drop samples while recording from airspy to /dev/null

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On 2014-12-17 18:25, Alan Stern wrote:
> On Sat, 13 Dec 2014, Udo van den Heuvel wrote:
> What are we supposed to see?  The lsusb output in the bug report lists 
> a bunch of devices, but it's not clear which one is the airspy.

I did not program the tools. But the other devices are keyboard, webcam
and some USB erupters.


> The bug report says there should be 10 M samples per second.  How many
> bytes are in a sample?  2?

I and Q samples are two bytes each.

> Now, maybe the transfer isn't just raw data.  Protocol overhead would 
> reduce the total throughput.  But since I don't know what the protocol 
> is, all I can tell you is the raw data rate.

I'll ask some usbmon folks to comment.

Kind regards,
Udo

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