Hello! I am an undergraduate student at Oregon State University working with RTL-SDR dongles for an academic project under supervision from Benjamin Brewster, and I had a dev question.
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.
Is there some line I might have overlooked, or some additional parameter(s) I might need to enter?
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
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@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
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@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@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
-
Hudspeth, Robert Lee -
Oliver Jowett -
Steve Markgraf