Re: [USRP-users] uhd latency test with b205mini

Wael Ali via USRP-users Tue, 03 Jul 2018 20:16:45 -0700

Dear Marcus and Neel
I'm really appreciate your reply
I'm using Dell Latitude E6320, USB 2
the output of "sudu lshw -html" is attached
I didn't have any kind of tunning except of real-time scheduling of the uhd



On Wed, Jul 4, 2018 at 2:28 AM Neel Pandeya <neel.pand...@ettus.com> wrote:

> Your latency will be made up of the delay caused by the USB bus itself,
> which you can't do much about, and the processing delay in your host
> computer.
>
> Have you profiled your application?
>
> Have you done any performance tuning on your system (CPU governors, R/W
> socket buffer sizes, etc.)
>
> What kind of hardware do you have? Could you attach the output of "sudo
> lshw -html"?
>
> --Neel Pandeya
>
>
>
>
> On 3 July 2018 at 14:57, Marcus D. Leech via USRP-users <
> usrp-users@lists.ettus.com> wrote:
>
>> On 07/03/2018 05:10 PM, Wael Ali via USRP-users wrote:
>>
>> Dear all,
>> please help me with this issue,
>>
>> while I'm testing latency between uhd and b205mini with latency_test file
>> provided with uhd examples gives me the following
>>
>> Summary (test1)
>> ================
>> Number of runs:   1000
>> RTT value tested: 1 ms
>> ACKs received:    302/1000
>> Underruns:        0
>> Late packets:     698
>> Other errors:     0
>>
>> Summary (test2)
>> ================
>> Number of runs:   1000
>> RTT value tested: 2 ms
>> ACKs received:    784/1000
>> Underruns:        0
>> Late packets:     216
>> Other errors:     0
>>
>>
>>
>>
>> *I need rrt<= 1ms, and I need to know, how to reduce the latency between
>> uhd and the device? Is this a hardware issue (related to usb port)? *
>> I've already tried to use low latency linux kernel, but the results were
>> almost the same.
>>
>> OS: Ubuntu 16.04
>> Kernel: 4.13.0-36-generic
>> UHD: 3.12.0.HEAD-0-gec786351
>> libusb: 0.1.12
>>
>> Thanks is advance
>> Wael Ali
>>
>> What type of computer?  Are you using USB3.0, or USB2.0?
>>
>>
>>
>> _______________________________________________
>> USRP-users mailing list
>> USRP-users@lists.ettus.com
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>
>

Title: iport

id:

iport

description:

Laptop

product:

Latitude E6320

vendor:

Dell Inc.

version:

serial:

J66T6R1

width:

64 bits

capabilities:

smbios-2.6 dmi-2.6 vsyscall32

configuration:

boot	=	normal
chassis	=	laptop
uuid	=	44454C4C-3600-1036-8054-CAC04F365231

id:	core
description:	Motherboard
product:	050F4T
vendor:	Dell Inc.
physical id:	0
version:	A00
serial:	/J66T6R1/CN1296121J0249/

id:	firmware
description:	BIOS
vendor:	Dell Inc.
physical id:	0
version:	A08
date:	10/18/2011
size:	64KiB
capacity:	1984KiB
capabilities:	pci upgrade shadowing cdboot bootselect edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi biosbootspecification

id:

cpu

description:

CPU

product:

Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz

vendor:

Intel Corp.

physical id:

bus info:

cpu@0

version:

Intel(R) Core(TM) i7-2640M CPU @ 2.80GH

serial:

To Be Filled By O.E.M.

slot:

CPU 1

size:

913MHz

capacity:

4GHz

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 rdtscp constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm epb pti retpoline spec_ctrl tpr_shadow vnmi flexpriority ept vpid xsaveopt dtherm ida arat pln pts cpufreq

configuration:

cores	=	2
enabledcores	=	2
threads	=	4

id:

cache:0

description:

L1 cache

physical id:

slot:

L1-Cache

size:

32KiB

capacity:

32KiB

capabilities:

internal write-back unified

configuration:

level

id:

cache:1

description:

L2 cache

physical id:

slot:

L2-Cache

size:

256KiB

capacity:

256KiB

capabilities:

internal varies unified

configuration:

level

id:

cache:2

description:

L3 cache

physical id:

slot:

L3-Cache

size:

4MiB

capacity:

4MiB

capabilities:

internal varies unified

configuration:

level

id:	memory
description:	System Memory
physical id:	41
slot:	System board or motherboard
size:	4GiB

id:	bank:0
description:	SODIMM DDR3 Synchronous 1333 MHz (0.8 ns)
product:	NT2GC64B88G0NS-CG
vendor:	Nanya Technology
physical id:	0
serial:	E6C31C11
slot:	ChannelA-DIMM0
size:	2GiB
width:	64 bits
clock:	1333MHz (0.8ns)

id:	bank:1
description:	SODIMM DDR3 Synchronous 1333 MHz (0.8 ns)
product:	NT2GC64B88G0NS-CG
vendor:	Nanya Technology
physical id:	1
serial:	D4CC1C12
slot:	ChannelB-DIMM0
size:	2GiB
width:	64 bits
clock:	1333MHz (0.8ns)

id:	pci
description:	Host bridge
product:	2nd Generation Core Processor Family DRAM Controller
vendor:	Intel Corporation
physical id:	100
bus info:	pci@0000:00:00.0
version:	09
width:	32 bits
clock:	33MHz

id:

display

description:

VGA compatible controller

product:

2nd Generation Core Processor Family Integrated Graphics Controller

vendor:

Intel Corporation

physical id:

bus info:

pci@0000:00:02.0

version:

width:

64 bits

clock:

33MHz

capabilities:

msi pm vga_controller bus_master cap_list rom

configuration:

driver	=	i915
latency	=	0

resources:

irq	:	26
memory	:	e1400000-e17fffff
memory	:	d0000000-dfffffff
ioport	:	4000(size=64)
memory	:	c0000-dffff

id:

communication

description:

Communication controller

product:

6 Series/C200 Series Chipset Family MEI Controller #1

vendor:

Intel Corporation

physical id:

bus info:

pci@0000:00:16.0

version:

width:

64 bits

clock:

33MHz

capabilities:

pm msi bus_master cap_list

configuration:

driver	=	mei_me
latency	=	0

resources:

irq	:	25
memory	:	e2eb0000-e2eb000f

id:

network

description:

Ethernet interface

product:

82579LM Gigabit Network Connection

vendor:

Intel Corporation

physical id:

bus info:

pci@0000:00:19.0

logical name:

eno1

version:

serial:

d4:be:d9:13:5c:00

capacity:

1Gbit/s

width:

32 bits

clock:

33MHz

capabilities:

pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation

configuration:

autonegotiation	=	on
broadcast	=	yes
driver	=	e1000e
driverversion	=	3.2.6-k
firmware	=	0.13-3
latency	=	0
link	=	no
multicast	=	yes
port	=	twisted pair

resources:

irq	:	28
memory	:	e2e00000-e2e1ffff
memory	:	e2e80000-e2e80fff
ioport	:	4080(size=32)

id:

usb:0

description:

USB controller

product:

6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2

vendor:

Intel Corporation

physical id:

bus info:

pci@0000:00:1a.0

version:

width:

32 bits

clock:

33MHz

capabilities:

pm debug ehci bus_master cap_list

configuration:

driver	=	ehci-pci
latency	=	0

resources:

irq	:	16
memory	:	e2e70000-e2e703ff

id:

usbhost

product:

EHCI Host Controller

vendor:

Linux 4.13.0-36-generic ehci_hcd

physical id:

bus info:

usb@1

logical name:

usb1

version:

4.13

capabilities:

usb-2.00

configuration:

driver	=	hub
slots	=	2
speed	=	480Mbit/s

id:

usb

description:

USB hub

product:

Integrated Rate Matching Hub

vendor:

Intel Corp.

physical id:

bus info:

usb@1:1

version:

0.00

capabilities:

usb-2.00

configuration:

driver	=	hub
slots	=	6
speed	=	480Mbit/s

id:

usb:0

description:

Bluetooth wireless interface

product:

DW375 Bluetooth Module

vendor:

Dell Computer Corp

physical id:

bus info:

usb@1:1.4

version:

5.17

serial:

60D819B62E49

capabilities:

bluetooth usb-2.00

configuration:

driver	=	btusb
maxpower	=	100mA
speed	=	12Mbit/s

id:

usb:1

description:

Video

product:

Laptop_Integrated_Webcam_HD

vendor:

001BFC1E1836-C102-15022A

physical id:

bus info:

usb@1:1.5

version:

c.17

capabilities:

usb-2.00

configuration:

driver	=	uvcvideo
maxpower	=	500mA
speed	=	480Mbit/s

id:

multimedia

description:

Audio device

product:

6 Series/C200 Series Chipset Family High Definition Audio Controller

vendor:

Intel Corporation

physical id:

bus info:

pci@0000:00:1b.0

version:

width:

64 bits

clock:

33MHz

capabilities:

pm msi pciexpress bus_master cap_list

configuration:

driver	=	snd_hda_intel
latency	=	0

resources:

irq	:	27
memory	:	e2e60000-e2e63fff

id:

pci:0

description:

PCI bridge

product:

6 Series/C200 Series Chipset Family PCI Express Root Port 1

vendor:

Intel Corporation

physical id:

bus info:

pci@0000:00:1c.0

version:

width:

32 bits

clock:

33MHz

capabilities:

pci pciexpress msi pm normal_decode bus_master cap_list

configuration:

driver

pcieport

resources:

irq	:	16
ioport	:	5000(size=4096)
memory	:	cfa00000-cfbfffff
ioport	:	cfc00000(size=2097152)

id:

pci:1

description:

PCI bridge

product:

6 Series/C200 Series Chipset Family PCI Express Root Port 2

vendor:

Intel Corporation

physical id:

1c.1

bus info:

pci@0000:00:1c.1

version:

width:

32 bits

clock:

33MHz

capabilities:

pci pciexpress msi pm normal_decode bus_master cap_list

configuration:

driver

pcieport

resources:

irq	:	17
ioport	:	6000(size=4096)
memory	:	e2d00000-e2dfffff
ioport	:	cfe00000(size=2097152)

id:

network

description:

Wireless interface

product:

BCM4313 802.11bgn Wireless Network Adapter

vendor:

Broadcom Corporation

physical id:

bus info:

pci@0000:02:00.0

logical name:

wlp2s0

version:

serial:

9c:b7:0d:35:1b:fe

width:

64 bits

clock:

33MHz

capabilities:

pm msi pciexpress bus_master cap_list ethernet physical wireless

configuration:

broadcast	=	yes
driver	=	wl0
driverversion	=	6.30.223.271 (r587334)
ip	=	192.168.1.6
latency	=	0
multicast	=	yes
wireless	=	IEEE 802.11

resources:

irq	:	17
memory	:	e2d00000-e2d03fff

id:

pci:2

description:

PCI bridge

product:

6 Series/C200 Series Chipset Family PCI Express Root Port 3

vendor:

Intel Corporation

physical id:

1c.2

bus info:

pci@0000:00:1c.2

version:

width:

32 bits

clock:

33MHz

capabilities:

pci pciexpress msi pm normal_decode bus_master cap_list

configuration:

driver

pcieport

resources:

irq	:	18
ioport	:	3000(size=4096)
memory	:	e2200000-e2bfffff
ioport	:	e0a00000(size=10485760)

id:

pci:3

description:

PCI bridge

product:

6 Series/C200 Series Chipset Family PCI Express Root Port 4

vendor:

Intel Corporation

physical id:

1c.3

bus info:

pci@0000:00:1c.3

version:

width:

32 bits

clock:

33MHz

capabilities:

pci pciexpress msi pm normal_decode bus_master cap_list

configuration:

driver

pcieport

resources:

irq	:	19
ioport	:	2000(size=4096)
memory	:	e1800000-e21fffff
ioport	:	e0000000(size=10485760)

id:

pci:4

description:

PCI bridge

product:

6 Series/C200 Series Chipset Family PCI Express Root Port 6

vendor:

Intel Corporation

physical id:

1c.5

bus info:

pci@0000:00:1c.5

version:

width:

32 bits

clock:

33MHz

capabilities:

pci pciexpress msi pm normal_decode bus_master cap_list

configuration:

driver

pcieport

resources:

irq	:	17
ioport	:	7000(size=4096)
memory	:	e2c00000-e2cfffff
ioport	:	e2f00000(size=2097152)

id:

generic

description:

SD Host controller

product:

OZ600FJ0/OZ900FJ0/OZ600FJS SD/MMC Card Reader Controller

vendor:

O2 Micro, Inc.

physical id:

bus info:

pci@0000:0a:00.0

version:

width:

32 bits

clock:

33MHz

capabilities:

pm msi pciexpress bus_master cap_list

configuration:

driver	=	sdhci-pci
latency	=	0

resources:

irq	:	17
memory	:	e2c20000-e2c201ff

id:

usb:1

description:

USB controller

product:

6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1

vendor:

Intel Corporation

physical id:

bus info:

pci@0000:00:1d.0

version:

width:

32 bits

clock:

33MHz

capabilities:

pm debug ehci bus_master cap_list

configuration:

driver	=	ehci-pci
latency	=	0

resources:

irq	:	17
memory	:	e2e50000-e2e503ff

id:

usbhost

product:

EHCI Host Controller

vendor:

Linux 4.13.0-36-generic ehci_hcd

physical id:

bus info:

usb@2

logical name:

usb2

version:

4.13

capabilities:

usb-2.00

configuration:

driver	=	hub
slots	=	2
speed	=	480Mbit/s

id:

usb

description:

USB hub

product:

Integrated Rate Matching Hub

vendor:

Intel Corp.

physical id:

bus info:

usb@2:1

version:

0.00

capabilities:

usb-2.00

configuration:

driver	=	hub
slots	=	8
speed	=	480Mbit/s

id:

usb:0

description:

Mouse

product:

Wireless Receiver

vendor:

Telink

physical id:

bus info:

usb@2:1.3

version:

1.00

capabilities:

usb-1.10

configuration:

driver	=	usbhid
maxpower	=	50mA
speed	=	12Mbit/s

id:

usb:1

description:

Generic USB device

product:

5880

vendor:

Broadcom Corp

physical id:

bus info:

usb@2:1.8

version:

1.01

serial:

0123456789ABCD

capabilities:

usb-1.10

configuration:

maxpower	=	100mA
speed	=	12Mbit/s

id:

isa

description:

ISA bridge

product:

QM67 Express Chipset Family LPC Controller

vendor:

Intel Corporation

physical id:

bus info:

pci@0000:00:1f.0

version:

width:

32 bits

clock:

33MHz

capabilities:

isa bus_master cap_list

configuration:

driver	=	lpc_ich
latency	=	0

resources:

irq

id:

storage

description:

SATA controller

product:

6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller

vendor:

Intel Corporation

physical id:

1f.2

bus info:

pci@0000:00:1f.2

version:

width:

32 bits

clock:

66MHz

capabilities:

storage msi pm ahci_1.0 bus_master cap_list

configuration:

driver	=	ahci
latency	=	0

resources:

irq	:	24
ioport	:	40d0(size=8)
ioport	:	40c0(size=4)
ioport	:	40b0(size=8)
ioport	:	40a0(size=4)
ioport	:	4060(size=32)
memory	:	e2e40000-e2e407ff

id:

serial

description:

SMBus

product:

6 Series/C200 Series Chipset Family SMBus Controller

vendor:

Intel Corporation

physical id:

1f.3

bus info:

pci@0000:00:1f.3

version:

width:

64 bits

clock:

33MHz

configuration:

latency

resources:

memory	:	e2e30000-e2e300ff
ioport	:	4040(size=32)

id:	scsi
physical id:	1
logical name:	scsi0
capabilities:	emulated

id:

disk

description:

ATA Disk

product:

KINGSTON SA400S3

physical id:

0.0.0

bus info:

scsi@0:0.0.0

logical name:

/dev/sda

version:

71E0

serial:

50026B777C00F78D

size:

111GiB (120GB)

capabilities:

partitioned partitioned:dos

configuration:

ansiversion	=	5
logicalsectorsize	=	512
sectorsize	=	512
signature	=	f17786cf

id:

volume:0

description:

EXT4 volume

vendor:

Linux

physical id:

bus info:

scsi@0:0.0.0,1

logical name:

/dev/sda1

logical name:

version:

1.0

serial:

638fdb4d-2763-4e8d-bf0f-259fc71e0951

size:

107GiB

capacity:

107GiB

capabilities:

primary bootable journaled extended_attributes large_files huge_files dir_nlink extents ext4 ext2 initialized

configuration:

created	=	2018-07-03 06:27:26
filesystem	=	ext4
lastmountpoint	=	/
modified	=	2018-07-03 21:36:01
mount.fstype	=	ext4
mount.options	=	rw,relatime,errors=remount-ro,data="">
mounted	=	2018-07-03 21:33:28
state	=	mounted

id:	volume:1
description:	Extended partition
physical id:	2
bus info:	scsi@0:0.0.0,2
logical name:	/dev/sda2
size:	3975MiB
capacity:	3975MiB
capabilities:	primary extended partitioned partitioned:extended

id:	logicalvolume
description:	Linux swap / Solaris partition
physical id:	5
logical name:	/dev/sda5
capacity:	3975MiB
capabilities:	nofs

id:

battery

product:

DELL Y61CV19

vendor:

SMP

physical id:

version:

03/30/2016

serial:

0001

slot:

Sys. Battery Bay

capacity:

48840mWh

configuration:

voltage

11.1V

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Re: [USRP-users] uhd latency test with b205mini

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