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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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Monitoring Internet latency

I've been using smokeping to monitor internet latency (for early problem detection) at 8.8.8.8 for several months. On Friday the average latency went from 12ms to 55ms and has been at the 55ms plateau for 3 days. Our WAN uses the same provider for…
josh
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Set up server far away from target audience?

I live in Canada, and I want to move out of online web hosting and host stuff on my own server. The problem is, my website caters to a huge amount of US traffic, about 90 percent of traffic is US. Are there huge disadvantages of having my server in…
Jimmy Huch
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Level 3 Communications Monitoring

Does Level 3 Communications offer any type of map of current network status? It seems our connection here is getting high latency through their network. Also what is the experience asking them questions about if one of their appliances is…
thursdasy
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What kind of latency numbers are reasonable for a corporate network?

I am a software developer and I sometimes want to work from home but to write code over on a VPN is just tortuously slow. I have tried several different things to try and make it more reasonable. On VNC I try and tweak it so that it is as light as…
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different ACK behaviors (slowing down throughput?)

I'm running netio (http://freshmeat.net/projects/netio/) on one machine (opensolaris) and contacting two different Linux machines (both on 2.6.18-128.el5 ), machine A and machine B. Machine A has a network throughput of 10MB/sec with netio and…
Kyle Hailey
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Measuring Site to Site Latency for Video Conferencing

We are currently looking at doing some international video conferencing, and before we go ahead and buy a system we need to measure Site to Site Latency & bandwidth objectively. I can't see any obvious products that will do this - can anybody make a…
The Waves
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How much does a IPtables router slow down a connection?

I would like to know if introducing a new gateway in my network will slow things down. The question may sound unclear but here is an illustration: Before Installing gateway server Main Router <=> switches <=> servers after installing gateway…
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Accurate way to check latency between Server?

First of all, I hope my post are is posted in the right section . Below are something i got confused hope you one can help. My business partner 's IP server are in: Sanjose, CA , and I am looking for a datacenter which give the least latency to that…
Rick
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Small TCP Window on WAN between 2 Locations

Site A: Denver datacenter. 60MBPS. Site B: Chicago. 100MBPS. ICMP pings: Packets: Sent = 176, Received = 176, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 74ms, Maximum = 94ms, Average = 75ms File transfer between…
Brent
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Traceroute provides a route that takes longer than 100 hops

I have a server that I configured using zoneedit. Upon running "traceroute" on it I notice that it takes more than 100 hops. How do I lower the number of hops? Is this really that bad or am I too paranoid? Would the nameserver play a role in the…
Santosh
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Another benefit of Lighttpd in front of Apache

I have read in a site that another benefit of having Lighttpd in front of Apache is lower number of child processes. Lighttpd will handle keep-alive and client requests while child processes of Apache gets to serve dynamic pages faster because of…
abednegoyulo
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Terminal server performance over high latency links

Our datacenter and head office is currently in Brisbane, Australia, and we have a branch office in the UK. We have a private WAN with a 768k link to our UK office and the latency is at about 350ms. The terminal server performance is reeeeealy…
holz
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Can Linux RAID 1 account for high latency?

Scenario: we're running a large (3TB total in cluster) Solr installation in EC2. I'm only concerned about disk performance on the read side of things. We suspect that we are limited by disk I/O and specifically get problems when an EBS volume…
Kevin Peterson
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Hyper-V inconsistent/high latency between two VMs on the same vSwitch

This is a clean installation of Windows 10 1903 with Hyper-V, though I've experienced this in previous versions of Windows 10. Add a private vSwitch (so, not tied to any physical network adapter). Install Linux on two VMs on the same server (tested…
Todd
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vCenter to vCenter transfers slow over 10Gbps 80ms link

We have two datacentres either side of the Atlantic with a 10Gb VPLS connection between sites with 80ms latency and better than 0.0000001% packet loss. When moving VMs between datastores on either end of the link we are seeing exremely slow speeds,…
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