On 11/26/2018 12:36 PM, Markus Kuhn via USRP-users wrote:
On 26/11/2018 16:35, Marcus D. Leech via USRP-users wrote:
I get near the end of the execution of both uhd_usrp_probe and
/usr/lib/uhd/examples/rx_samples_to_file the following error message:
[ERROR] [UHD] Exception caught in safe-call.
in virtual usrp2_fifo_ctrl_impl::~usrp2_fifo_ctrl_impl()
at
/build/uhd-YDOjRX/uhd-3.13.0.1/host/lib/usrp/usrp2/usrp2_fifo_ctrl.cpp:54
this->peek32(0); -> RuntimeError: fifo ctrl timed out looking for
acks
Any ideas what might cause this? (The same problem does not
occur with an N210 tested on the same PC.)
What happens if you ping the device aggressively (with longer
packets, and a higher cadence)??
No ICMP packet drops with 1500 byte packets and 0 interval:
$ sudo ping -q -i 0 -s 1472 -c 1000 192.168.10.2
PING 192.168.10.2 (192.168.10.2) 1472(1500) bytes of data.
--- 192.168.10.2 ping statistics ---
1000 packets transmitted, 1000 received, 0% packet loss, time 8904ms
rtt min/avg/max/mdev = 8.790/8.871/8.918/0.078 ms, ipg/ewma
8.913/8.873 ms
Also no packet drops with up to -l 7 packets in the pipe:
$ sudo ping -q -l 7 -i 0 -s 1472 -c 1000 192.168.10.2
PING 192.168.10.2 (192.168.10.2) 1472(1500) bytes of data.
--- 192.168.10.2 ping statistics ---
1000 packets transmitted, 1000 received, 0% packet loss, time 8689ms
rtt min/avg/max/mdev = 8.859/61.001/61.314/2.757 ms, pipe 7, ipg/ewma
8.698/61.218 ms
(One packet missing with -l 8, 41% missing with -l 9.)
I'm wondering if this is some known problem with the current USRP2
driver or OS, as earlier driver/OS combinations did not result in this
error message.
Markus
If you back out to an older version of UHD (3.10 series), I'm going to
guess that it works fine.
This is an issue, I recall, that is in the "queue" to be fixed. But the
USRP2 has been EOL now for almost a decade, so fixes won't be
prioritized as highly as for newer, still-current, devices.
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