Re: [Discuss-gnuradio] (no subject)

[Marcus Müller]

Hi Rui,

so, what does your software /do/ to transmit samples? What is the sampling rate you're working at?

U and L are, as you noted, usually caused by computational insufficiency of the computing platform, but that might have many reasons, not only CPU.

Best regards,

Marcus

On 07/30/2017 05:06 PM, Rui ZOU wrote:

Hi there,

I'm using USRP X310 and the host is Dell OptiPlex 7040. The application is built using GNURadio companion 3.7.10.1
trying to transmit using both the daughter boards.

When two channels transmit the same file, the transmission can last for a while before producing  U and L and get stuck. When transmit two different files, U and L come up instantly after starting the application. The grc files are attached.

I have read this page https://files.ettus.com/manual/page_usrp_x3x0_config.html regarding U and L, tried the possible configurations to get over this, but failed.

The CPU information (obtained using lshw in Ubuntu 16.04) of the host is shown below.

     *-cpu
          description: CPU
          product: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
          vendor: Intel Corp.
          physical id: 18
          bus info: address@hidden
          version: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
          slot: Socket 0
          size: 3945MHz
          capacity: 4200MHz
          width: 64 bits
          clock: 100MHz
          capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp cpufreq
          configuration: cores=4 enabledcores=4 threads=8

Regards,

Rui

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