Zero copy data transfer from Linuxulator to FreeBSD?

[Lundberg, Johannes]

Well, I did something similar a couple of years ago where I grab raw data
from a special infrared camera with proprietary USB driver. I sent the raw
data to a FreeBSD process using sockets where it is processed and becomes
the input data for the gesture recognition software API. It was kind of
unstable due to poorly written proprietary driver so I couldn't use it that
much.

Now there's a new device with totally new driver and I thought I'd give it
a try again. From my previous attempts I think I came to the conclusion
that shm can not be used between a Linux and a native process...

Raw data transfer rate is something like 100 Mbit/sec (2.4 Mbit at 45 fps).

I think the driver allocates memory for the data and transfers it there
from the USB device so I guess zero copy would be impossible.. At least if
I could do it with one copy would be nice..

Something like:

USB device -> Linux driver's memory -> [IPC] -> native process


On Fri, Apr 1, 2016 at 1:17 AM, Hans Petter Selasky <hp at selasky.org> wrote:

> On 04/01/16 04:38, Lundberg, Johannes wrote:
>
>> Hi
>>
>> I have a USB driver that runs in Linux mode and I want to transfer data to
>> a native program for processing.
>>
>> I think that shared memory is not possible, what are other (zero copy)
>> options?
>>
>> Thanks!
>>
>>
> Can you explain a bit how the current program moves data around?
>
> --HPS
>

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