Merge remote-tracking branch 'origin/Set_kernel_parameters_for_X4x0' into integration_2023_w21

radio/USRP/USERSPACE/LIB/usrp_lib.cpp

@@ -1127,6 +1127,10 @@ extern "C" {
       device->type = USRP_X400_DEV;
       usrp_master_clock = 245.76e6;
       args += boost::str(boost::format(",master_clock_rate=%f") % usrp_master_clock);
+
+      // https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks
+      if (0 != system("sysctl -w net.core.rmem_max=62500000 net.core.wmem_max=62500000"))
+        LOG_W(HW, "Can't set kernel parameters for X4x0\n");
     }
 
     s->usrp = uhd::usrp::multi_usrp::make(args);