Hi, I am * using a N321 w/ UHD 4.6.0. * Running one channel at 100 Msps on a very fast machine. * Interface over a 10 GbE over RJ45 (on-board interface to PlanetLabs SFP-RJ45 transceiver). * Running a custom C++ application. * Not using DPDK. I intermittently (once every 2-3 runs) get an error in the RX path. The error appears to be fatal (i.e. no more samples received). RfnocError: OpTimeout: Control operation timed out waiting for ACK Any suggestions? Eugene. Eugene Grayver, Ph.D. Principal Engineer 310-336-1274

Correction to previous post: Sample rate is 125 Msps at a master_clock_rate of 250 MHz. I am * using a N321 w/ UHD 4.6.0. * Running one channel at 100 Msps on a very fast machine. * Interface over a 10 GbE over RJ45 (on-board interface to PlanetLabs SFP-RJ45 transceiver). * Running a custom C++ application. * Not using DPDK. I intermittently (once every 2-3 runs) get an error in the RX path. The error appears to be fatal (i.e. no more samples received). RfnocError: OpTimeout: Control operation timed out waiting for ACK Any suggestions? Eugene. Eugene Grayver, Ph.D. Principal Engineer 310-336-1274

- using a N321 w/ UHD 4.6.0.
- Running one channel at 100 Msps on a very fast machine.
- Interface over a 10 GbE over RJ45 (on-board interface to PlanetLabs
SFP-RJ45 transceiver).
- Running a custom C++ application.
- Not using DPDK.

Hey Eugene, nothing comes to mind immediately. Are you starting the stream, and then doing nothing else? When does the error happen, at the beginning of the streaming, or at any time? --M On Fri, Jul 4, 2025 at 11:10 PM Eugene Grayver <eugene.grayver@aero.org> wrote: > Correction to previous post: Sample rate is 125 Msps at a > master_clock_rate of 250 MHz. > > I am > > - using a N321 w/ UHD 4.6.0. > - Running one channel at 100 Msps on a very fast machine. > - Interface over a 10 GbE over RJ45 (on-board interface to PlanetLabs > SFP-RJ45 transceiver). > - Running a custom C++ application. > - Not using DPDK. > > > I intermittently (once every 2-3 runs) get an error in the RX path. The > error appears to be fatal (i.e. no more samples received). > > RfnocError: OpTimeout: Control operation timed out waiting for ACK > > Any suggestions? > > Eugene. > > > Eugene Grayver, Ph.D. > Principal Engineer > 310-336-1274 > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-leave@lists.ettus.com >