I'm trying to monitor a few P25 systems with channels that are not closely spaced, requiring multiple RTL-SDR receivers to cover. I've found that when the 4th receiver is used (not a specific receiver, just the 4th simultaneous one to be brought up), I get USB errors such as:
23:20:44.861 ERROR i.g.d.s.t.u.USBTransferProcessor - [R820T 1001] - USB I/O ERROR while submitting transfer buffers [283MB/393MB 72%]
23:20:44.861 WARN i.g.d.s.t.u.USBTransferProcessor - [R820T 1001] - restart attempt [3] failed - retrying [283MB/393MB 72%]
23:20:44.872 WARN i.g.d.s.t.u.USBTransferProcessor - [R820T 1001] - maximum restart attempts [3] exceeded for tuner - stopping [296MB/393MB 75%]
23:20:44.873 INFO i.g.d.source.tuner.Tuner - [RTL2832 SDR/R820T 1001] tuner is now disabled for error [USB ERROR] [296MB/393MB 75%]
(This was when running sdrtrunk commit e26698d0d881ad9712ac62570e793a8d291fc313, similar errors occurred in releases from earlier in the year).
I've tried spreading the receivers across different USB ports and buses, but it did not seem to make a difference.
I would assume there is some resource that is being exhausted. I'm looking for suggestions on how to troubleshoot, or information on what limitation I am running into.
Thanks!
23:20:44.861 ERROR i.g.d.s.t.u.USBTransferProcessor - [R820T 1001] - USB I/O ERROR while submitting transfer buffers [283MB/393MB 72%]
23:20:44.861 WARN i.g.d.s.t.u.USBTransferProcessor - [R820T 1001] - restart attempt [3] failed - retrying [283MB/393MB 72%]
23:20:44.872 WARN i.g.d.s.t.u.USBTransferProcessor - [R820T 1001] - maximum restart attempts [3] exceeded for tuner - stopping [296MB/393MB 75%]
23:20:44.873 INFO i.g.d.source.tuner.Tuner - [RTL2832 SDR/R820T 1001] tuner is now disabled for error [USB ERROR] [296MB/393MB 75%]
(This was when running sdrtrunk commit e26698d0d881ad9712ac62570e793a8d291fc313, similar errors occurred in releases from earlier in the year).
I've tried spreading the receivers across different USB ports and buses, but it did not seem to make a difference.
I would assume there is some resource that is being exhausted. I'm looking for suggestions on how to troubleshoot, or information on what limitation I am running into.
Thanks!