Questions tagged [latency]

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

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Mikrotik Hotspot Performance Degradation: So Slow Hotspot Unusable

FAULT: Hotspot created with Mikrotik's "ip > Hotspot" wizard is so painfully slow that it is unusable Googling "mikrotik hotspot slow" returned a gazillion results, none of which resolved this fault....
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Interleaving, and its effect on VDSL2 latency

(Re-posting from Network Engineering SE, turns out this was actually off-topic there.) Having moved to a new house I hired with an ISP a broadband internet plan. The technician told me I live really ...
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Insanely high latency when full bandwidth is in use

When I use the full bandwidth my ISP is providing, I get insanely high latency in every website, more than 1000ms. I did a test on 3 of my friends' internet connection, including mine. I took a ...
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Investigating ping latency

Usually in a LAN I get smth like : Reply from 192.168.1.1: bytes=32 time<1ms TTL=64 with the occasional 10ms. But today on a friend's home I found 32ms consistently when pinging the router. The ...
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Chrome Developer Tools - Network “Content Download” column

I've got a question about the Chrome Developer Tools - Network Tab - "Content Download" part in the waterfall column. What exactly does this mean? Is latency somehow relevant to this? Retrieving ...
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Monitor performance/latency while copying file across Point 2 point circuit

This is my first post here, i did do a quick search couldn't find exactly what i was looking for. I am copying a file from one server located in NW part of the country to another server located in ...
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48 views

Is memory latency still a key factor in computer speed?

A search on the real-world benefit of low latency RAM seems to yield very old testing done on equally old hardware. Is CAS latency essentially irrelevant now against other performance characteristics ...
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32 views

Balance interrupts with irqbalance

I got irqbalance enabled in my rhel8 server and I got following results in /proc/interrupts while testing for tcp latency with qperf CPU0 CPU1 CPU2 CPU3 26: 15840985 ...
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Qperf tool provides unreliable tcp latency results

I used qperf to measure tcp latency between aws instances but it provides results with huge variation in different times. With qperf I sent 1KB tcp packets to measure the latency and I run the test ...
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i want to upgrade laptop ram with compatible timing (CL - cas)

sorry my english not very good this is my laptop (Acer aspire 5 A515-51G-5400) i want upgrade my laptop ram to 12gb with 8gb but i confused about what timing "CL" should buy i have now 6gb in my ...
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High Network Latency in One Direction

In my home network, the ping between my laptop (connected via WiFi to the router FRITZ!Box 7590) and my desktop (connected via LAN) is quite asymmetrical. From laptop to desktop: Consistently below ...
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How to avoid Jitter on a LAN network?

I recently acquired fiber connection at home, but I faced an issue, every 10 minutes, the connection kinda stop and then restart. Which cause websites or any software that require internet connection ...
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Storage system bottleneck after sitting idle

I am working with a computer system that acquires data from a digitizer card. When the computer sits idle for 1 hour or more, and I begin data acquisition, I receive an error relating to not acquiring ...
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Where does internet latency comes from?

Sorry if this was asked before. Couldn't find anything about it on SE. So the distance from San Francisco to Australia is about 8,000 km. This source indicates that the latency among the two ...
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104 views

Wifi Latency : modem or internet carrier?

I would like to know if problems I have in wifi depends on the internet provider or the wifi. Mac OS 10.9.5. Router D-Link. Wi-Fi Frequency 2.4Ghz. The internet providers says the signal is ...
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Latency of SSDs versus HDDs

We are currently using an HDD for our NetApp storage for our VMs. We're considering replacing them with SSDs, but many disk manufacturers have different performance. What range of latencies can we ...
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Run a tracert continually for period of time

I have a site where network speed and specific network related activities become very slow. I want to run a tracert from one of the PC's onsite to, say, a file server or print server located at our ...
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Why am I observing periodic latency “spikes” under Linux, when testing over Wi-Fi?

I'm experiencing a strange behaviour when trying to measure the latency between two computers, running Linux (Ubuntu 16.04 LTS), connected to Wi-Fi (5 GHz 802.11n) through a common access point. This ...
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Network Issues and Slow Throughput

Background I worked as a Customer Service Technician at a DSL Provider, when DSL was the "new technology," so I'm approaching the Problem below from that perspective. Problem Note: I've moved this ...
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What causes GPU global memory latency?

I was asking myself what causes GPU global memory latency. I mean the global memory works e.g. on a frequency of 1700MHz (e.g.) and has a 352bit lane, this means it can move around 600GB/s. But then ...
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Why is gen2 ping latency much lower than other linux?

When I tried to optimize network latency, I noticed that gen2 linux ping latency is much lower than other linux systems (centOS, ubuntu, redhat, ...) For example, in my LAN gen2 rtt ping latency is ...
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How can I remove the latency from my USB QWERTY keyboard to play piano with it in real time?

I'd like to use my USB QWERTY keyboard to play piano with various MIDI apps and websites. For anyone who has tried this, the problem is that keystrokes from the keyboard aren't send to the computer ...
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29 views

Regarding Two Devices creating latency on a single switch

I have scripts that run on bootup on two NAS's (let's say they're QNAPs) to create bonds and have different ips for different vlans. ie- NAS 1 (all NICs bonded to 1 via TLB) set bond0 -> 0.0.0.0 or ...
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IPoIB with Netem (Latency emulation) Poor performance

I have to emulate a wide area network. My setup contains two servers with MT27500 Family [ConnectX-3] Infiniband cards. Default latency between both nodes is ~0.4ms and iperf test shows throughput of ...
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223 views

If you live far away from popular DNS servers, is it still recommended to use them? [closed]

My friend suggested that I should use one of popular DNS servers like Google. Since there are no nearby DNS servers from where I live, I thought I would do a DNS benchmark and to my surprise, ...
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Windows 10 - High DPC Latency And ISR Causes Audio Drop Outs And Lag

I've been facing audio stuttering, drop outs and performance lag on my Windows 10 laptop. The lag is sometimes so bad the Windows almost freezes. It lasts for around 5 - 10 seconds and then goes away ...
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171 views

Which RAM should I prefer (CL vs PC)? [closed]

I'm thinking to buy new RAM (for Lenovo 320 15AST, motherboard is LNVNB161216). I had 4GB, I need 8GB. My current RAM is m471a5143sb1 2133Mhz, CAS (CL) 17, PC19200. I was looking at two with such ...
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392 views

High ping with Ubuntu 17.10 host

When pinging the computers in my WLAN all hosts (router, raspi, Debian Stretch desktop, ...) have low latencies of a few ms, except for one: my Ubuntu 17.10 desktop has latencies of 50 to several 100 ...
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739 views

TP-Link powerline adapter causing extreme latency on primary network? Wired devices on Fios router, not connected to powerline adapter, are affected

To preface, I am not a networking guy but work in IT. I'm going to bullet point the situation so it's easier to digest. Here is a little diagram I created in paint to give a visual aid. I pay for ...
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Zero latency to 8.8.8.8

Tp-link wifi routers have built in system tools like ping and Traceroute. Please see the outputs of ping and Traceroute commands from my Tp-link router. How can this be ? This happens only with 8.8.8....
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131 views

Ping to same address gives me different IP´s

When on windows 10 in cmd.exe a ping is made to cryptopia.co.nz, I get one of the following results: Pinging cryptopia.co.nz [45.60.13.241] with 32 bytes of data: Reply from 45.60.13.241: bytes=32 ...
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Fluctuating WiFi latency

I am trying to troubleshoot my unreliable WiFi, but I am lost. My wired connections work flawlessly, but my WiFi has massively fluctuating latencies. This occasionally knocks out my Chromecast. Here ...
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How Do USB 3.0 Hubs And USB Extension Cables Effect Latency, If At All?

I currently have three peripherals (mouse, keyboard, Wacom tablet) all wired to an individual USB port on my computer. They also each have their own 6ft USB extension cable (passive) because the ...
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Could the latency (ping) lie?

I'm playing Rainbow Six Siege and I have a decent ping around 50 to the European servers... My friend in the middle-east have one around 130 but he can spot enemies 3 seconds before I do; via my own ...
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My WIFI connection has high ping periodically

My friends don't have this problem. I tried to change the router but it didn't work. My laptop is Predator 15 with Killer Wireless n/a/ac 1535 Wireless Network Adapter. Here is the screenshot when ...
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Audio glitchy and stuttering when network is active few days after reboot

I´ve had this problem for a while now: A few days after a reboot, the audio gets choppy whenever something is going on at the network, regardless of if the audio is streaming or locally stored. The ...
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344 views

ADSL latency/ping times

I am correct in believing that no fault on the actual DSL part of a broadband connection would affect latency? By 'DSL part' I am referring to the modem at the customer premises, the copper pair back ...
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446 views

Why does enabling WMM on a WiFi router cause increase in latency?

With only a single device connected to a WiFi router, enabling WMM (WiFi Multimedia) increases the latency by 80-90%. Overall throughput increases significantly, however. Why does enabling WMM ...
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55 views

Modem and internet: fixing low connectivity and latency spikes?

So I got a tp-link TD-8817 adsl2+ modem at times the connection is intermittent. Right out of the box it does´t connect so to set it up following the quick connection wizard: Pick the time zone ...
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348 views

How to optimize tcp stack for low latency when throuput is not a priority?

I have a wireless link with packet loss of up to 10%. It has to carry one rtp stream, nothing else. Datarate of the stream is <100kb/s so the lowest datarate offered (1 mbit/s) by wlan (802.11b) is ...
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154 views

One-Way Ping Jitter Test

Would a public website like I describe here have any value? Does something similar already exist? Right now, I'm using tracert to debug a network problem in which there is a delay at times between ...
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195 views

Traceroute RTT latency-jump before and not after transatlantic crossing?

so I did a traceroute from my home-box (situated in Europe) to an US-Server. Now I get a protocol that looks like this: 7 er1.ams1.nl.above.net (80.249.208.122) 30.536 ms 32.328 ms 32.315 ms ...
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DPC Latency issues caused by storport.sys

I have been having an issue with DPC latency. I have spent hours trying to figure out how to fix it, but I have failed to find a solution. To begin, I first noticed this issue after I cloned my ...
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340 views

Latency Ethernet (LAN)

I just bought a CAT6 Ethernet cable from Amazon for $20, The length of cable is 20m and I am receiving 2ms - 150ms to my gateway, It's very rare that it peaks to 150ms but I've never saw my LAN go ...
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How ping to google server can exceed light speed? [duplicate]

when i try ping google server takes only 30ms. PING google.com (172.217.26.174) 56(84) bytes of data. 64 bytes from google.com (172.217.26.174): icmp_seq=1 ttl=56 time=31.2 ms 64 bytes from google....
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Latency issue on new pc

DPC latency checker shows latency: Is this a hardware problem somewhere? msinfo32 shows IRQs Ok. I am using win10x64.
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DPC latency issue

My Asus ROG laptop (i7-6700HQ, GTX960M, 8GB DDR4, 1TB Samsung 850Evo SATA SSD, Win10 64bit) has been painfully slow, sometimes at its worst even slightly moving the mouse takes 5 seconds. Playing ...
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How can I benchmark the bandwidth and latency of the connection between my PC and wireless router?

It seems like this should be easy in theory, especially the latency part. Just spam the router with packets and see how many get returned and how long they take. Is there any way to do this?
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Low latency video shared in local gigabit network using linux

For a robotics task we need to share the video (Webcam) live to about 6 or 7 users in the same room. OpenCV will be used on the clients to read the situation and send new tasks to the robots. Latency ...
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Why is DDR4 latency so much higher on AMD CPUs than on Intel CPUs? How is performance affected?

According to PassMark software, DDR4 memory latencies on AMD CPUs are more than 4 times higher than latencies on Intel CPUs. This has been confirmed on my Corsair Vengeance LED 2x16GB DDR4 PC4-24000 [...