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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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Impact of Traffic through the first NIC on the second NIC

I have two NICs on a RHEL 6 server. They are both set at 1GB/sec full duplex. The first NIC has lots of small (< 100 byte) TCP socket writes. The second NIC is used to receive a 50 MB/sec TCP input stream where latency is critical. In this setup,…
Prasoon Tiwari
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How can I determine the fastest memory based on latency and bandwidth?

I've got some older hardware that needs a memory upgrade, and I was trying to determine what RAM would be the fastest on the platform. My platform takes DDR2 667MHz which is (slightly) more expensive than DDR2 800MHz for example. So here are the…
Stephen
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How to reduce DNS server latency?

Which is the best practise to reduce DNS latency? I'm using the beautiful powerdns DNS server, and i would like to lower down latency between internet client requests and the DNS server response. I know that working on the DNS zone backend (I'm…
dAm2K
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DSL :: Connection top speed is ok, but acceleration is low

My 2048 Kb/S ADSL connection downloads at the expected download speed 220 KB/s , but it takes too long to get to that speed, in other words the top speed is fine but the acceleration is terrible. This is not a problem with large downloads because…
doc_id
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Why would reducing capacity under load improve latency on a server?

In this talk at Berkeley, Jeff Dean's slides contain the following note, about a third of the way through the presentation: Non-intuitive: remove capacity under load to improve latency (?!) The intuition I have is that less load on the box would…
Kevin Burke
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What is the internal latency of a Cisco 3560?

Our trading network is very latency sensitive. We use Arista switches for the latency sensitive parts, and we know that the latency there is 600 ns. However, we have a Cisco 3560 in part of the network and we need a rough idea of that switch's …
Ted Graham
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use a offside proxy server to optimize site delivery?

Actually we have following setup for our website that gets traffic around the world: All JS, Images, Photos are stored on a CDN: Cloud Files ("Akamai light" powered). The WebApp server who send the dynamic content out are located in Switzerland, the…
Nenad
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Ways to estimate which network destination result is shorter/faster network path?

I am writing a program that allows users to supply a list of hostsname or IPs which I will then find out which host connectivity is faster and connect to it. And right as I am typing the question in the title, I thought that pinging might be a…
Jake
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How to log latency from remote sites to web server?

I have a web server that works great for North American users, but users from Asia will have problems every once in a while. I need to collect some data and the first set is to get some trending for the latency in that area. If I have access to a…
evolvd
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Fastest secure machine-machine network configuration

We currently host a large number of our application servers in a 3rd party data centre. Connectivity is then provided to our users across Europe through the vendor’s network. These machines run Solaris 10 on x86 hardware. We have access to the…
Karle
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What settings should I modify to tune a Linux server for very small yet very high packet rate UDP receive loads?

I am tuning a server that needs to handle small (average of about 50 bytes) UDP packets. The average packet rate is approximately 100,000 packets/second. The data is very burst and can sometimes burst to 5x the mean packet rate. What settings should…
Louis Marascio
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Slow upload to Server 2008 DC, Downloads work as expected

I have a Windows Server 2008 Domain Controller that I run as a do-it-all server. It has a GbE connection to the network and to every machine on the network. Downloads from the server file shares work as expected, between 70MB/s and 80MB/s to all the…
Anthony
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Linksys SRW248g4p Latency Issues

Pinging between the linksys the ping times are averaging 40ms. I have evening tried pinging between two Linksys switches that are connected to each other directly using the GB ports. There have no modification done to the switches and the firmware…
Garfield81
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What’s the best switch with bandwidth limiter for my Internet Cafe?

I'm looking for the best switch and router for my internet cafe, that have bandwith limiter and have low latency... Thanks
user64865
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Latency of Harddisk-Access WLAN vs USB (Windows)

it would be kind if someone who is an expert on this field state what I have to expect in regards to the latency accessing files for the given scenarios (comparing them): A) Current Windows PC with an attachedn USB Harddisktrive vs B) Two current…
jens
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