15 Aug
2019
15 Aug
'19
5:50 p.m.
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?
15 Aug
15 Aug
10:08 p.m.
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
16 Aug
16 Aug
6:17 p.m.
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(a)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
7:45 p.m.
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(a)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(a)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
1725
days inactive
1726
days old
3 comments
3 participants
participants (3)
-
Hudspeth, Robert Lee -
Oliver Jowett -
Steve Markgraf