Coding Support

Oliver Jowett oliver.jowett at gmail.com
Fri Aug 16 17:45:47 UTC 2019


dump1090 is not expecting samples on stdin, it uses librtlsdr directly; now
you have two things competing for the same dongle. It's got nothing to do
with the zero-copy stuff.

Oliver


On Sat, 17 Aug 2019 at 00:19, Hudspeth, Robert Lee <hudspero at oregonstate.edu>
wrote:

> Hello, Steve. I tried the fix you suggested the other day, but I still end
> up with the same error as before.
>
> I thought it'd help if I show what exactly I'm seeing in my console output
> when I try to run both dump978 & dump1090 at the same time.
>
> *Robert L. Hudspeth*
>
>
> On Thu, Aug 15, 2019 at 1:15 PM Steve Markgraf <steve at steve-m.de> wrote:
>
>> Hi Robert,
>>
>> On 15.08.19 17:50, Hudspeth, Robert Lee wrote:
>> > I'm trying to run utilities that capture 978
>> > <https://github.com/mutability/dump978> & 1090Mhz
>> > <https://github.com/mutability/dump1090> traffic simultaneously, but I
>> > can't seem to stop rtl_sdr from allocating too many zero-copy buffers
>> > and preventing both programs from running simultaneously (I'd like to
>> > cut down from 15). I've been through librtlsdr.c and rtl_adsb.c with the
>> > hope of manually changing some variable that will let me accomplish this
>> > to no avail.
>>
>> Just increase the usbfs memory limit, the default is only 16MB.
>> Either write the new size, or completely disable the limit with:
>>
>> echo 0 > /sys/module/usbcore/parameters/usbfs_memory_mb
>>
>> Regards,
>> Steve
>>
>
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