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

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Why do Jumbo Frames hurt latency?

Recently I've been reading about jumbo frames and I got confused in a few places. As far as I understand there is a lower bound on the Ethernet frame size between 'store and forward' points (layer 2 ...
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12 views

DPC Latency checker tool analog for Linux

I'm using my server for HFT trading. I like DPC Latency tool http://www.thesycon.de/deu/latency_check.shtml because it allows me to check that "everything allright". On the well-tuned Windows machine ...
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14 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 ...
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35 views

Should I change my notebook Wi-Fi card?

I saw a lot of topics about Wi-Fi, noisy, high round-trip time (RTT). I do made some troubleshootings and I conclude that maybe I need change my mini PCI Wi-Fi card. My OS is Windows 7 x64 and the ...
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1answer
23 views

Remote Support (Remote Desktop) Possible From Overseas?

bit of an unusual question here - I am a desktop support professional located in the US, whose clients are all in the US or Canada. Essentially my job entails taking remote control of PCs and ...
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21 views

Possibly a bufferbloat?

not very long ago ive noticed high latency and slowdown in responsiveness in my network. what is weird is it seems to only occur from 10 am to 10 pm (been this way for a week now). 10 pm onwards it ...
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110 views

understanding traceroute output to diagnose an issue with Verizon FIOS

Tech support has tried, and failed, to repeatedly fix anything, which makes me think the issues are deep within the Verizon network. But I'd like a quick sanity check, since I'm not very experienced ...
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2answers
519 views

High latency/ping to local gateway WHILE STREAMING [wireless]

Recently I've become fed up with my wireless internet and want to identify the problem. I don't have a patch cord yet to test a direct connection but so far every computer I've tested has reported ...
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35 views

Why do I get these latency spikes in games? How do I fix them?

http://pastebin.com/VkisYYMw Results of ping to a LoL server, results are similar to a Dota 2 server. As you can see, the ping flares up going as high as 500 to 600 ms at times. I have tried ...
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35 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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1answer
62 views

How do I artificially increase the latency for a device in my network?

I want to test how ping would affect my gameplay on Call of Duty on PS4 and was wondering if there was a way to add about 100ms latency to my PS4's network connection?
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128 views

Routers with multiple user increasing latency by request is normal?

I guess my modem have a problem with multiples users sending packages simultaneously, in the past I shared my internet connection with others 4 devices (computers and smartphones) and I played online ...
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2answers
574 views

Very low latency streaming

I'm looking to stream a live lecture into an overflow lecture theater. I'm planning to stream HD content along with audio from a powerful server with nVidia GeForce GPUs connected to the client via a ...
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62 views

What is usable latency for ssh and RDP?

What is usable latency for ssh and Windows Remote Desktop Connection (RDP)? By usable, I mean for things like editing text through a text editor over ssh or RDP so that the latency wouldn't drive the ...
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1answer
346 views

Improve and Reduce Latency in DD-WRT with QoS

I was tasked with making a home network today and after installing DD-WRT in one of the routers, I ran some diagnosis and the games became a problem. There is usually one or two people using Internet ...
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1answer
80 views

How to use OS X's terminal to ping an IP using the latency as a stopping condition for a loop?

What I'd like to do is to ping an IP while the latency is above an specific value. I think an example will help: Let's suppose I have the following result to the "ping *IP here*" command: PING *IP ...
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1answer
104 views

How do I optimize Windows disk I/O for high-latency throughput?

Let's say there are 25 processes each which want to read and index a large (say, 1GB) file. The hard drive may be capable of ~100MB/sec throughput, but the head movement and rotational latency ...
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2answers
4k 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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2answers
165 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 ...
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2answers
143 views

Is there a way to use a service to lower your latency?

There is this service wtfast that claims it can lower your ping in some games. Is this true? How it works?
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1answer
710 views

Is it ok to mix CL4 memory with CL5?

I have 2 x 1GB on 800Mhz CL4 memory in my PC. I'm planning to upgrade to 6GB by adding a pair 2GB modules. Is it ok if I buy CL5 modules or do I have to buy CL4?
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187 views

Stuttering/Latencies when LAN/Ethernet Driver active

I experience heavy video/audio stuttering when playing a video or general latencies when downloading a file when connected via LAN/Ethernet NOT when connected via WLAN/Wifi. According to my ...
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264 views

What is a good WLAN ping time on a clean network?

More specifically, what is your local WLAN ping time (e.g., between a host on the WLAN and your router, or between two hosts on the WLAN, divided by 2)? I had assumed it would be well under 1 ms for ...
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1answer
159 views

What changes to my network settings in Windows 7 can I make to achieve lower latency for gaming?

What changes to my network settings in Windows 7 can I make to achieve lower latency for gaming? I have heard of changing TCP settings in the registry, but I have also heard conflicting information on ...
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1answer
25 views

Decreasing Latency on App Similar to high frequency trading

I have a bot on a server that accesses information from a website at a very specific time. I want to minimize the time that it takes for their website to get my request and be the first person in line ...
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3answers
5k views

Very high latencies with WiFi

We bought a new WiFi router / ADSL modem at home (Asus DSL-N55U-B) and the wifi connection occasionally has very high latencies (up to 20 seconds, versus most common 25 miliseconds when pinging google ...
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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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456 views

Windows 7 Line In Delay Issue

I'm running Windows 7 Pro 32-bit on my Dell Latitude 2100 netbook and I'm having an issue with the line in device/driver/functionality. The device & driver are stock: Driver Date: 7/13/2009 ...
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1answer
63 views

Best way to work over SSH (~250ms)

The server in question gives a pretty terrible latency of 250ms since it's on the other side of the globe. Now I'm supposed to develop software in that server, and as you'd guess, it's pretty ...
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2answers
187 views

When buying RAM on a budget, do I choose higher capacity or lower latency?

I would like to know how much of a difference is attainable by using RAM with lower timings and whether that difference is justified by the price. Phrased differently, will lower latency RAM also have ...
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1answer
54 views

Download speed and ping suffers during PC to PC file copy

Why does the ping and internet download speed suffer on PC#1 when files copied from PC#1 to PC#2? During file copy, my ping goes from 20ms to 600ms+, Download speed goes from 1.8MB/S to 250 KB/S give ...
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2answers
177 views

How to monitor changes in the frequency of network latency spikes over time?

I'm currently trying to troubleshoot an issue with my network in which I get latency spikes up to 200 seconds (normally around 50 secs) in an apparently random way at apparently random moments of the ...
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647 views

SSH and Latent Connections (e.g., satellite connections)

Most of the week I live in the city where I have a typical broadband connection, but most weekends I'm out of town and only have access to a satellite connection. Trying to work over SSH on a ...
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2k views

Simulating network latency for localhost connection on Windows 7

I need to simulate network latency to a program running on the local computer, connecting to a local service. Thus far I have tried dummynet (a windows build of ipfw) which I got working after some ...
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784 views

Why would dropbox cause an increase in Latency

I am trying to figure out why Dropbox seems to be completely disturbing my internet connection and if others may be having the same problem. When Dropbox is idle, I ran a speed test. I get a ping to ...
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251 views

Internet lags for me, but not for my brother

Recently we had a new switch setup in our basement, plus my PC has the newest parts oldest dating 2012. When I play games that requires instant responding like Counter-Strike, League of Legends, FIFA ...
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92 views

Achieving very low network latency in Windows (<1ms)

I'm running windows server 2008 R2 on my server and I need to optimise my latency to a certain server, which is currently ~0.4ms (both servers are remote servers in the same datacenter). The server ...
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322 views

How can I reduce latency on VLC

I 'm working on a video streaming application. Server is a Linux machine (ffmpeg-ffserver) and client is a Windows machine (vlc player). There is a latency of about 6 seconds. Despite the fact that ...
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363 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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110 views

I'm having DPC latency issues with my computer

The LatencyMon report will be added to the end of this. I recently got a modi and magni amp and dac combo and I've had audio stuttering issues. Here is a image of all my drivers I was told that I ...
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1answer
328 views

Experiencing lockups due remote system Hard drive being shut off

Whenever I open a homegroup folder on another computer on my network, and the remote harddrive has to spin up, windows explorer seems to lock up until the remote request completes. This affects ...
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3answers
568 views

Why does latency increase when downloading or uploading?

I recently discovered that latency increases when a download or upload is in progress on my DSL line, sometimes quite drastically. Initially I thought there was a fault on the line but discovered the ...
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4answers
4k views

Negative ping time?

This is the first time I've seen this and I'm not sure what it means; 64 bytes from 74.125.93.99: icmp_seq=6233 ttl=53 time=545.493 ms 64 bytes from 74.125.93.99: icmp_seq=6234 ttl=53 time=776.093 ...
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Options to increase network lattency [duplicate]

I need to permanently increase network latency in approximately 100ms, without losing packets. Reason: On a certain server and internet game my ping is too much lower than the other people playing ...
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34 views

Why do I experience latency to certain IP's

This one has me stumped. I read a lot and ask very few questions. I usually have 2 or 3 SSH sessions at any given time. Monitoring applications, working on server configs that type of daily grind. ...
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2answers
4k views

Calculating hard disk block model reading time

My professor posted a slide on how to calculate the data retrieval from hard disk using the block model. The specs were: 7200 RPM 5ms SEEK 80MB/s TRANSFER RATE BLOCK MODEL : Block size 4KB I ...
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617 views

Xeon vs overclocked i7 Extreme for lowest latency

I am aware that the differences between high-end i7 and Xeon are: compatibility with dual socket motherboards, total L2/L3 cache size. overclocking capability. extra cores - Haswell ...
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2answers
2k views

DSL vs Cable latency

currently I have a 10Mbps DSL line and I'm thinking to switch to a cable since they got 100Mbps for a little less than double the price I'm paying for 10Mbps. In other words the cable company is ...
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2k views

Lowest Latency Sound Card

I'm using a sound card for reading analogue signals and for the ADC component. I need extremely low latency (<1ms). Is the sound card the right way to go or can you get better results with a custom ...
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How to approach searching for sources of interface unresponsiveness

On Debian Linux: On a relatively powerful machine I ran an update and both the kernel and the window manager got updated to newer version. At that point the machine become noticeably less responsive: ...