Re: [Discuss-gnuradio] Kernel Ubuntu - USB 3.0 trouble - missed packets

[Gilad Beeri (ApolloShield)]

install (apt) cpufreq-utils and indicator-cpufreq, you'll get a UI icon to set the CPU to "performance" mode.

On Fri, May 19, 2017 at 1:02 AM Marcus Müller <address@hidden> wrote:

Hi Cristian,

hm, the Intel 8 series tends to work well.

What is it that you're doing with these samples in GNU Radio? Just UHD Source -> Null Sink, right?

Gut feeling: your computer might have adaptive power saving, so that your CPU is scaled down sporadically, and then has a hard time processing the samples in real time when they're there.

Not being overly familiar with how that works under Ubuntu's UI: can you set the CPU to "performance" mode (or just disable frequency scaling alltogether) for a test?

Best regards,

Marcus

On 18.05.2017 23:50, Cristian Rodríguez wrote:

On 16/05/17 06:49, Neel Pandeya wrote:

Hello Cristian:

If you use Ubuntu 16.04.2, the kernel is 4.8, which should be fine.

First at all, thank you very much for answering.

My kernel version is: 4.8.0-49-generic
Ubuntu Release:    16.04.2 LTS

 

The specific USB controller is also very important. The Intel controllers work best. Which controller do you have in your system? (run "lspci")

It is the information dropped by "lspci"

 

00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5)
00:1c.1 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #2 (rev d5)
00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5)
00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 (rev d5)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation HM86 Express LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05)
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 850M] (rev a2)
04:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

What flow control errors are you seeing? Are there any overruns ("O") or underruns ("U") printed on the console?

There are overruns "000000000000000"

Did you increase the socket buffer sizes?

https://files.ettus.com/manual/page_transport.html#transport_udp_sockbufs

No, i haven't. But i did modified the num_recv_frames to 1024. By doing it, I don't lose samples, but i'm not pretty sure about i'm in fact reciving all. Do you think it is a better solution that trying to install other USB3 controller?

 

Thanks a lot for your time to read my message.

Best regards,

Cristian

2017-05-15 23:49 GMT-05:00 Neel Pandeya <address@hidden>:

Hello Cristian:

If you use Ubuntu 16.04.2, the kernel is 4.8, which should be fine.

The specific USB controller is also very important. The Intel controllers work best. Which controller do you have in your system? (run "lspci")

What flow control errors are you seeing? Are there any overruns ("O") or underruns ("U") printed on the console?

Did you increase the socket buffer sizes?

https://files.ettus.com/manual/page_transport.html#transport_udp_sockbufs

--​Neel Pandeya

On 15 May 2017 at 17:20, Cristian Rodríguez <address@hidden> wrote:

HI all.

I was writing to the forum a time ago because i have missed packets when i build a simple flow graph in gnu radio and set the sample rate over 20Msamples/s.

The conclusion was that i had to review my USB 3.0 drivers but i'm working on ubuntu (16.05) and the only way to change the drivers is by installing another kernel. I have the newest version then i think the way is to install an older version.

What version of kernel could someone recommend me? I need to be able to get all the samples from my USRP B210. If someone has another suggestion i would be very thankful about it.

Pdta: My computer is fast enough (i7 4710HQ - 12Gb ram). Then it is not the problem.

Thanks a lot.

Best regards,

Cristian.

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