On 06/07/2019 12:29 PM, Mark Koenig via USRP-users wrote:
I am using a thunderbolt 3 interface, but only using it at 1Gig, 
standard 1500 MTU.  I am running at a sample rate of 25Msps.
If the problem is less-prevalent at lower sample rates, that suggests that your interface is dropping packets.
Keep mind that 1 Gig interface can support 25Msps at the absolute 
maximum at standard sample sizes.  So, you're
  right on the edge, and if the host interface is occasionally dropping 
frames during a control transaction, that will
  cause a failed transaction--the UHD protocol assumes an error-free 
channel, and has no provision for dealing with
  dropped packets.


Mark

*From: *Neel Pandeya <neel.pand...@ettus.com>
*Date: *Thursday, June 6, 2019 at 2:00 PM
*To: *Mark Koenig <mark.koe...@iubelttechnologies.com>
*Cc: *"usrp-users@lists.ettus.com" <usrp-users@lists.ettus.com>
*Subject: *Re: [USRP-users] UHD Comms Error

Hello Mark:

This may indicate a hardware problem. What is specifically eliciting the error? Does it occur with every time that there is a tune request? Are you running your own program, or one the example programs, such as "rx_samples_to_file"? Could you please try upgrading to UHD 3.14.0.0, and re-running your test, and let me know your results?
--Neel Pandeya

On Thu, 6 Jun 2019 at 12:47, Mark Koenig via USRP-users <usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote:
    Please help, with the error I am seeing.

    I am currently using an X310 with a UBX160 daughtercard and I get
    the error below when changing the frequency parameters of the radio.

    RuntimeError: EnvironmentError: IOError: Radio ctrl (A) packet
    parse error - AssertionError: packet_info.packet_count ==
    (seq_to_ack & 0xfff)

    in uint64_t radio_ctrl_core_3000_impl::wait_for_ack(bool)

    I am currently running UHD 3.9.7, but have also seen a similar
    error with 3.10.2

    Thanks

    Mark

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