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

From: Cristian Rodríguez
Subject: Re: [Discuss-gnuradio] Kernel Ubuntu - USB 3.0 trouble - missed packets
Date: Sun, 28 May 2017 01:38:59 -0500
Hi all.

Thanks a lot for your help.

What do you think about it?

If I type lsusb in the terminal i get it:

Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 2500:0020 
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 004: ID 0bda:0139 Realtek Semiconductor Corp. RTS5139 Card Reader Controller
Bus 003 Device 003: ID 04f2:b3fd Chicony Electronics Co., Ltd
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I have 3 USB3.0 Ports and 1 Card reader, so for example in the bus 001:

Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Then, i think i have two drivers, and the number 1 is the driver from Linux?

Could it be my driver trouble?

If you type lsusb what do you get?

Again, thanks a lot.

Best regards,

Cristian


2017-05-28 1:30 GMT-05:00 Cristian Rodríguez <address@hidden>:
Hi Marcus.

Thanks a lot for your answer.

Could you please run the ieee802.11 transceiver flowgraph of Bastian ? And please, tell me if you get overruns, without modifing the number of buffers?

Really you would help me a lot. Because i don't understand why i get overruns when other people don't and it is frustrated for me. My Pc is brand new. When i execute the flowgraph it only uses around 60% of the processor and 40% of the RAM. Then I really don't understand.

My computer is Asus, i don't know if Asus maybe has a problem with the USB 3.0 ports. Maybe. Asus is bad sometimes in that way. Because i had an i5 Asus, i run the flowgraph and it didn't work, then i though. it was my computer, then i got another, and my new one is a gamer computer so it doesn't make sense.

If you have some info, my PC is Asus N550JK.

Thanks a lot.

 

2017-05-18 18:03 GMT-05:00 Marcus D. Leech <address@hidden>:
On 05/18/2017 06:00 PM, Marcus Müller 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

 I'll comment that using num_recv_frames has sometimes been necessary for my apps, usually set to 256 or 512, and once I do that, I don't get
  overruns any more.




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"
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@hiddenom> 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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