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Questions tagged [latency]

Latency is the time period between a signal being sent and a signal being received

Latency is the time period between a signal being sent and a signal being received. In computer networking this can be the time between a sending of a packet and receiving of a packet.

To illustrate we can use the ping command:

PING google.be (173.194.66.94) 56(84) bytes of data.
64 bytes from google.be (173.194.66.94): icmp_req=1 ttl=47 time=76.6 ms
64 bytes from google.be (173.194.66.94): icmp_req=2 ttl=47 time=74.8 ms
64 bytes from google.be (173.194.66.94): icmp_req=3 ttl=47 time=79.6 ms

The latency here is 76.6 ms.

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Network Latency over WAN

Let me take a minute to explain the background of the challenge I am facing. My company has offices in US and Asia. The users work on large CAD files. The office in US has NAS (Network Attached Storage) where all the files are stored. The US users…
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High latency on domain with CDN

High latency on domain with CDN I have problems with latency on my server, these are the tests I made with blitz.io Latency album https://i.stack.imgur.com/nKV1r.jpg I would uploaded images here but it requires 10+ rep, and can't post multiple links…
Cokaric
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Hosted Network Latency

Background I have a new hosted, dedicated database server behind a dedicated firewall (Cisco ASA 5505 Sec+). The plan is to have a virtual (aka "cloud") web server or two on the other side of the firewall connecting back to the backend DB…
Mark Brackett
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Measuring network latency

I want to measure performance of the network, especially latency. We are performing stress tests of a system that sends live audio / video data over the network. When there are multiple simultaneous connections (e.g. 100 connections) we are…
empi
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Diagnosing network latency issues

I have two servers both with gigabit network cards that were experiencing severe latency issues communicating with one another. The culprit eventually turned out to be that one of the servers was patched into a 100mb switch port. pinging the…
oooo ooo
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Performance issue in using Amazon S3 for run-time updates

I have a web application hosted in Amazon EC2 as well as in Rackspace. Users can upload files through this application and also modify them. Those files are stored in local storage in each of these servers and are synchronized using unison. In order…
Srikanth Vittal
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Cross-cloud deployment: Servers on azure - Mongodb at MongoHQ (AWS) - known pitfalls?

Looking to deploy an existing Mongodb-backed solution to the cloud for a client. I'm hoping to combine MongoHQ and Azure to use the simplest possible Mongodb deployment together with the simplest possible .Net deployment. Possible problems I can…
Erik I
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Distributed File System Replication (DFSR) between Server 2008 & Server 2008 R2 over Gateway to Gateway VPN causing extreme network latency

The company I work for is in the process of setting up a branch office for one of our clients. We have 1.5 Mbps up/down T1s at each location, a Cisco RV042 router at each location hosting a Gateway to Gateway VPN tunnel between the two locations,…
Strahn
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Measure data transfer throughput?

How can I benchmark the network transfer speed of my servers? We already have an existing file server, but it is fairly old. We recently got a donation of a (relatively) newer P4 box, and I wanted to find a way to test its network+disk I/O speeds to…
lfaraone
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What is the maximum normal latency for internal gateway switch?

I've been observing the ping latency to my server's internal gateway switch from my server machine. I noticed the ping spikes to as high as 500ms at times. Is this a possible indication that the switch is overload or this is perfectly normal?
Flint
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What can make windows fileshares slow without affecting ping latency, remote desktop, cpu usage or disk access?

I've got a server named Babylon. It's running Windows Server 2003 SP2 and lives in the midwest. I can ping Babylon from remote machines in the same building by hostname and IP. The latency is <20ms. I can ping Babylon from machines in another state…
Bill Carey
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QoS switch messing with local http traffic?

WE just moved our rack to a datacenter in the building. In our rack is a blade running centos and apache for intranet stuff. When we moved to the DC, we essentially extended our LAN there via adding a cisco switch. Since moving there, our intra…
stormdrain
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Measuring latency to a firewalled server

The firewall in front of this server is blocking ping requests. Is is still possible to measure latency to this system? If so, how?
chrism2671
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VPN drops (DPC latency issue)

I am using VPN to connect to work. I am used to listening to streaming music when I am in the office, but when i do that over the VPN, the connect drops. So, no big deal, I just won't use the streaming music when I'm on the VPN. But I just had a…
ScottStonehouse
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How to determine the fastest location for a server?

I'm in Australia and I'm looking at US hosting options because the prices here are embarrassingly extortionate. Are there any good, free online tools I can use to find out which location in the US has the fastest performance - in terms of latency…
Shabbyrobe
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