Latency is the time difference between the start of an event and the time that the effects become noticeable.

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Benchmarking network latency

I am trying to measure the latency of sending a packet. I do this as follows. The client sends recorded time. The server receives the packet and gives the difference between the current time and the ...
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33 views

Super Slow (latency + speed) Wireless AP's, Suggestions?

Looking for some advice, we have: Router: Asus RT-N66U, 2.4ghz wireless is disabled 2 Engenius ECB350 Access Points configured on Channel 6, 20mhz HT mode, 1 on each floor (900 sq ft each) - both ...
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18 views

How to decrease gigabit ethernet network latency in Linux?

I have a cluster with Gigabit ethernet network. I don't need more bandwidth but the latency is important. ping shows that the latency between nodes are about 100 microseconds. Is there a way to have ...
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84 views

Does USB 3.0 implements transaction translator with USB 1.1 devices?

I have a USB 1.1 device (Full-speed device) which when plugged into a USB 2.0 hub, operates as hi-speed on the upstream ports of the hub, and I can write a message on the USB bus each 0.125ms. I am ...
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9k views

Very high latency caused by router?

I'm getting very high pings (2000-10000ms), and intermittent internet connection when using a wireless router (be it on LAN or WAN). When connecting a desktop directly to the cable modem, there are no ...
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127 views

Many Transition from drive PhyRdy to PhyNRdy causing latencies in Windows 7?

My old Windows 7 pro sp1 laptop is becoming slow. It freezes randomly for between 1 and 3 seconds before displaying a context menu, or when switching between windows. After long searches, I suspect ...
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2answers
70 views

Why game latency fluctuates aggressively during day?

I play World of Warcraft (uses TCP) from India, on a server located in France. I get 180-200ms in-game past midnight which is quite comfortable for me, and unfortunately the best I can get due to the ...
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22 views

Any Tips To Remove Touchpad Delay? (Synaptics, HP Probook 455 G2)

I have an HP Probook 455 G2 laptop which I use occasionally. When using an external pointing device (i.e. MX Master via Bluetooth) I notice very little latency between moving the mouse and seeing ...
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1answer
890 views

How to reduce latency on FFmpeg video streaming?

On a video streaming application between Linux server (FFmpeg) and Windows client (VLC player), there is a noticeable latency of about 10 seconds. FFmpeg command: ffmpeg -re -f v4l2 -i /dev/video0 ...
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7k views

Debugging Linux I/O latency

I'm having some I/O problems on a couple of Linux systems that I administer. They manifest in that processes often block for up to several seconds in such simple syscalls as open(), unlink() or close()...
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25 views

How to add latency to TCP packets?

I have tried netem and wanem neither seem to be affecting the TCP packets. How can I add latency to TCP packets?
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73 views

Different latency on 2 different TV's

Im streaming games from my pc to my living room with a Raspberry and Moonlight. The thing is, when I play on a LG M2362D I have no latency. But when i play on a Philips 47PFK6589/12 I do have a ...
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37 views

what makes latency and ping high?

I'm geting high latency and ping so I'm wondering what does really makes ping and latency higher , and how to solve that, i made some research and that TcpAckFrequency and TCPNoDelay didnt seem to ...
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1answer
680 views

Airport Extreme Base Station roaming network crazy ping times

I have two new AEBS' setup as a roaming network. One is in the basement (DHCP/NAT) and one in my office (ten feet away) in Bridged mode and is setup with identical SSID/PWD, etc. The issue is that I ...
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1answer
215 views

Microsoft Word 2003 - Debug loading times?

Loading new and most local documents is fast as hell, but a few specific documents can take up to 10 minutes to load, which is not acceptable. I know that these documents have macros enabled and ...
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170 views

Why does Windows not need a low latency or real time kernel

All Linux distros have problems with latency when audio recording , gaming ,etc. But the Windows kernel can be used for audio recording , gaming or anything without a delay. Why does Windows not need ...
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4answers
3k views

High DPC Latency and Slow Hard Pagefaults on Gigabyte GA-EP35C-DS3R Motherboard

I've owned a DIY-built PC on a Gigabyte GA-EP35C-DS3R motherboard for about 2 years now. When I first built this PC, it ran perfectly under Windows XP 32-bit. Performance was good, and I had no issues ...
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28 views

Network Emulation on a Bridge?

When I try to use Network Emulator for Windows Toolkit on a bridge or Ethernet adapter connected to the bridge it has no affect on the machine connected via the bridge. Could somebody explain how to ...
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2answers
76 views

Tracking Bandwidth & Latency in Linux [closed]

I'm trying to write a simple script that can detect dips in network traffic (both bandwidth and latency in both directions) between 2 arbitrary hosts in my network over time. Is there a tool to do ...
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2answers
1k views

What might cause high latency when bandwidth is saturated?

I've been having network problems for a while and I'm trying to track down the source of the issue. Yesterday, I was transferring a file from my laptop to my desktop with SCP, over my wifi ...
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2answers
396 views

Ping my URL from a different location

Is there a way to someway mirror a ping request to an URL, to test it's speed from a different location? Say I'm in US and want to request a ping to my website coming from India and check the latency....
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6answers
9k views

Does increasing upload or download speed reduce ping?

I have a 5 MB/s connection, but I always notice high ping when playing online games. When the network is stable (i.e. when pingtest.com reports the connection as 5 MB/s), the ping stays at 50 ms, but ...
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31 views

GNU/Linux distro with the kernel v3.13 low latency

I am a Linux guy with a 100% free Linux distro sponsored by the Free Software Foundation called Trisquel GNU/Linux (v7) 64-bits. It has the linux kernel v3.13 low latency and I wanted to update the ...
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345 views

Audio Latency on Virtualbox Windows Guest on Linux Host

I am trying to run Cubase (music production system) inside a Virtualbox Windows Guest machine on a Linux Host. I have also installed the ASIO4All driver on the Windows Guest to reduce the latency. ...
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127 views

Do active USB extensions cables cause delay(game controller)?

How much of an input delay would cause using 2 active 5m USB extension cables with an xbox 360 3m wired controller? Also, any risk of input not going trought? I'm kinda forced to this kinda of ...
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2answers
7k views

What's the minimum network latency for a 1000 km connection using optic fibers?

I know most of the network latency for short distances is due to router processing times. But for longer distances the speed of light also counts. And it's different from the speed the light in the ...
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128 views

how to replace “isolcpus=1-13” with “cgroup/csets” (for better latency)?

I've set isolcpus=1-13 in my tuned-adm custom profile: [root@localhost]# tuned-adm active Current active profile: myprofile [root@localhost]# cat /etc/tuned/myprofile/tuned.conf [main] include=...
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13 views

Are there any established network quality classifications?

I'm finishing a program that sends a lot of data over TCP/IP. I'd like to test it with various quality networks to measure how well it works under different conditions. Are there any established ...
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1answer
436 views

D-Link DIR-850L QoS not working

Quality of Service is not working on my router. My seedbox (Xios) is set to the lowest priority and does not get throttled as it should when any of the higher priority devices require more bandwidth, ...
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39 views

Is latency from hardware interrupts a hardware, driver or kernel issue?

Being a power user I have spent countless hours tuning systems, checking DPC latency blah blah All of this begs the question why are we still dealing with these issues? I personally can't tell if ...
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151 views

High kernel latency ALL windows

I have been known about this site for a while. So I decided to register since most hardware and enthusiast forums well uhh you know, not worth it. Im a certified hardware tech and I noticed some ...
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2answers
368 views

Sporadic high latency on my home network

tl;dr My home network recently has been experiencing jumps from 27ms latency to 600ms. It doesn't happen always, and seems to occur frequently at night. What equipment should I buy and tests should I ...
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1answer
249 views

A low latency wireless network for 200+ users? [closed]

I'm developing a mobile application with realtime voice communication between two device in the same local wireless network. Our biggest challenge is to have a minimum latency during this conversation ...
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1answer
89 views

How to keep my ping/latency steady in cs 1.6?

I have broadband connection with 512 kbps speed. Sometimes I get 200 latency and sometimes 300. How can I keep that steady? It's really annoying.
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238 views

High latency, High CPU Interrupts per second 60K/Second causing FPS spikes in games

CPU Profiling Screenshot: LatencyMon Battlefield Screenshot: Processes: 1.3ms of execution time on the NVIDIA Windows Kernal?: I'm not familiar with the concept of Interrpts/sec, ...
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234 views

Best Latency between Hyderabad in India to Atlanta US

I would like to know what is the best latency I should expect between Hyderabad, India to Atlanta, US ? Currently I get a time=280ms when I ping my destination server in Atlanta, US. I want to ...
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2answers
101 views

Assistance needed with high latency on a home network compared with office network with two connections from the same ISP?

I’m having trouble with my home network’s high latency and would be glad if someone can shed light on what is causing the issue. Could it be because of my router (Buffalo AirStation Nfiniti running DD-...
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1answer
56 views

Latency semantics of read registers on x86 ASM

Per A. Fog's instruction tables, an Ivy Bridge has a 3 cycle latency on a MOV instruction. So the following will take 3 cycles to move RAX into the address in RCX: mov [rcx], rax ...
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314 views

Random internet drops on new Skylake build

I just finished my new Skylake build and I have random internet loss. While browsing the page sometimes get stuck, Facebook chat disconnects or downloads are quitting. However the internet icon on ...
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1answer
353 views

Why am I getting latency between my modem and my router?

I pay for a 15mbps down, 1mbps up DSL internet plan from TekSavvy Solutions (Canada). At least once or twice a week there will be moments where we get speeds much lower than advertised. When I notice ...
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153 views

How do I Introduce Latency to a Serial Port

I am looking for a way to introduce latency to a serial port. I am using a radio through a USB port and am looking to purposely delay the transmission by some amount of time (hopefully in an easily ...
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2answers
68 views

Networking fundamentals: Does a Gbps LAN has a better latency than a 100Mbps LAN?

I wil ask it in another way: If I want to transfer via LAN a rather big number (say 1.000) of rather small (say 10 bytes) files (total 10KB size), should I get better results in a 1Gbps LAN network ...
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23 views

Infiniband latency concerns

I got two hosts with Voltaire HCA500Ex-D (MT25408 ConnectX Mellanox) 10Gbit cards connected to a Cisco SFS7000d IB switch via CX4 3m cables. I'm really concerned about latency, which is higher than ...
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2answers
8k views

Can I run games smoothly on a server via RDP? [closed]

Is it possible to run games on a hosted server smoothly via RDP? I have a dedicated server running Windows Server 2012 R2. It has 144 GB of RAM, an Intel Xeon E5 and GeForce GTX 750 Ti GPU. It's a ...
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1answer
60 views

Google Hangouts messages latency vs. typing alert

Using the Hangouts app, I consistently see that the ellipsis/dots disappear, and hence tell me the other user is done typing, several seconds before I actually see their message. This is not related ...
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1answer
2k views

I sometimes get lag spikes causing ping times of 200 ms; might using different (e.g. Google's) DNS servers be better?

I live in the UK and I am a heavy gamer and I get lag spikes that take my ping to 200ms. Will using a third-party DNS Service, for example the one provided by Google, rather than those provided by my ...
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1answer
780 views

What's the theoretical latency of 802.11ac?

Inspired by this slide, I became curious to know the (theoretical) latency of the latest WiFi standard. However Google didn't help. This ppt's 8th slide, compares latency of 802.3 (3000 microsecs) ...
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2answers
209 views

Testing network application with virtual network and artificial latency

In order to test a network application in a controlled manner I want to create some sort of virtual network on a single machine in which I can control latencies. (I am running Ubuntu 14.04 x64). I ...