Thanks Marcus, for your fast reply.
On Sat, Apr 26, 2025 at 4:08 AM Marcus D. Leech <patchvonbr...@gmail.com> wrote: > On 25/04/2025 20:50, Nikos Balkanas wrote: > > Hello, > > I need to buy a new NIC. What would you suggest? > The one I use is an old Mellanox 10 Gbs, before the Connect-4 series. > It can only do 1996 S/s, need 19960 (10x more) to work with latest uhd. > Using Ubuntu 24.04 and uhd 4.6.0 > > So, 1.996ksps vs 19.960ksps? You hardly need a 10Gbit link to support > that. So, perhaps something > is being lost here in your requirements? > True. Can't explain it in terms of bandwidth. 16 * 1996 = 31.936 Kbps, 16 * 19960 = 319.360 Kbps well short of a 10 Gbps line:( Does a complex pair count as 1 sample, or 2? I have followed all the instructions in https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks, Even installed the DPDK drivers. My Mellanox is too old to use their OFED drivers:( > > On a related question. it seems that the streamer doesn't crash anymore > when receiving less than MAXSPS samples, instead it reads 0:( > This was due to the sse2 code not aligned in convert. > I change my stream args to cpu_format=sc16, otw=sc16, so no conversion > required. > Streamer still doesn't read anything. Is there a reason for it? > > You'd need to share more of your code. This should just work as far as I > can tell. > > Thanks. these are just the usrp code: int main() { uhd_stream_args_t stream_args = { .cpu_format = "sc16", .otw_format = "sc16", .args = "", .n_channels = 1, .channel_list = &channel }; ..uhd_stream_cmd_t stream_cmd = { .stream_mode = UHD_STREAM_MODE_NUM_SAMPS_AND_DONE, .stream_now = true }; if (uhd_init(0, 0, gain)) do_exit(20); > if ((err = uhd_usrp_get_rx_stream(dev[0], &stream_args, > rx_streamer[0]))) > { > uhd_get_last_error(errmsg, 127); > error(log, "Failed to get streamer[0] (%d). %s.\n", 0, FL, LN, > FN, err, errmsg); > uhd_rx_streamer_free(&rx_streamer[0]); > rx_streamer[0] = NULL; > uhd_rx_metadata_free(&md[0]); > md[0] = NULL; > do_exit(30); > } > if ((err = uhd_rx_streamer_max_num_samps(rx_streamer[0], &maxsamps))) > { > uhd_get_last_error(errmsg, 127); > error(log, "Failed to get max samples/buffer[0] (%d). %s.\n", 0, > FL, LN, FN, err, > ..errmsg); > do_exit(35); > } > if (maxsamps != MAXSMPS) > warn(log, "Incorrect maxsamples (%ld). Expected %d.\n", 0, FL, > LN, FN, maxsamps, > MAXSMPS); > info(log, "Max samples/buffer[0]: %ld\n", 0, maxsamps); > > if ((err = uhd_rx_streamer_issue_stream_cmd(rx_streamer[0], > &stream_cmd))) > { > uhd_get_last_error(errmsg, 127); > error(log, "Failed to start streamer[0] (%d). %s.\n", 0, FL, LN, > FN, err, errmsg); > do_exit(40); > } > [...] do_exit(0) } > bool uhd_init(size_t channel, double srate, double gain) > { > double tmp; > uhd_rx_metadata_error_code_t err; > > if ((err = uhd_set_thread_priority(uhd_default_thread_priority, > true))) > warn(log, "Unable to set main thread priority (%d). %s.\n", > 0, FL, LN, FN, > err, uhdError(err)); > /* Create USRP */ > f ((err = uhd_usrp_make(&dev[channel], "type=x300"))) > { > error(log, "Failed to create USRP (%d). %s.\n", 0, FL, LN, FN, > err, > uhdError(err)); > dev[channel] = NULL; > return(FAIL); > } > info(stderr, "Created USRP with args\n", 0); > > /* Create RX streamer */ > if ((err = uhd_rx_streamer_make(&rx_streamer[channel]))) > { > error(log, "Failed to create rx_streamer[%d] (%d). %s.\n", 0, FL, > LN, FN, > channel, err, uhdError(err)); > return(FAIL); > } > /* Create RX metadata */ > if ((err = uhd_rx_metadata_make(&md[channel]))) > { > error(log, "Failed to create md[%d] (%d). %s.\n", 0, FL, LN, FN, > channel, > err, uhdError(err)); > return(FAIL); > } > > /* Get master clock rate */ > if ((err = uhd_usrp_get_master_clock_rate(dev[channel], 0, &tmp))) > { > error(log, "Failed to set master clock to %.0lf Mhz (%d). > %s.\n", 0, FL, > LN, FN, tmp/1000000, err, uhdError(err)); > return(FAIL); > } > info(stderr, "Master clock is at %.0lf Mhz\n", 0, tmp/1000000); > /* Set the sample rate */ > if (srate && !uhd_set_rx_rate_check(channel, srate)) return(FAIL); > /* Set the tuner gain SBX-120 is 0-31.5 in .5 db steps */ > if ((err = uhd_usrp_set_rx_gain(dev[channel], gain, channel, ""))) > { > error(log, "Failed to set tuner[%d] gain to %.0lf db (%d). > %s.\n", 0, FL, > LN, FN, channel, gain, err, uhdError(err)); > return(FAIL); > } > if (!(err = uhd_usrp_get_rx_gain(dev[channel], channel, "", > &tmp))) > info(log, "Tuner[%d] gain set to %.0lf (%.0lf) dB\n", 0, > channel, tmp, gain); > ./* Set channel bw to conserve tuner resources. Not needed, set by srate */ uhd_usrp_set_rx_bandwidth(dev[channel], srate, channel); ./* Disable subtracting constant averaged background. Signal looks cleaner */ if ((err = uhd_usrp_set_rx_dc_offset_enabled(dev[channel], false, channel))) { warn(log, "Failed to disable FPGA DC offset on channel %d(%d). %s.\n", 0, FL, LN, FN, channel, err, uhdError(err)); } info(stderr, "Disabled FPGA DC offset on channel %d\n", 0, channel); return(SUCCESS); } This is the generated output: [INFO] [UHD] linux; GNU C++ version 13.2.0; Boost_108300; UHD_4.6.0.0+ds1-5.1ubuntu0.24.04.1 [INFO] [X300] X300 initialization sequence... [INFO] [X300] Maximum frame size: 8000 bytes. [INFO] [X300] Radio 1x clock: 200 MHz Sat Apr 26 03:33:48 2025 [00] [+] Created USRP with args Sat Apr 26 03:33:48 2025 [00] [+] Master clock is at 200 Mhz Sat Apr 26 03:33:48 2025 [00] [+] Tuner[0] gain set to 30 (30) dB Sat Apr 26 03:33:48 2025 [00] [*] scanner.l:1446:main Incorrect maxsamples (1996). Expected 19960. Sat Apr 26 03:33:48 2025 [00] [+] Max samples/buffer[0]: 1996 [WARNING] [0/Radio#0] Ignoring stream command for finite acquisition of zero samples I hope this reads OK. Maybe next time I should attach the code:) > TIA > Nikos > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com > > >
_______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe send an email to usrp-users-le...@lists.ettus.com
