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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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How is it possible that I'm getting a 13ms ping RTT from London to a New York IP?

I have created a Digital Ocean - App Platform app in the New York region. When I ping my domain, I get this IP address: 172.67.143.96 and this RTT 13.501ms If this IP address is actually in New York as I wanted it to be, the ping from London should…
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Print Infrastructure: How many LAN printers is too many?

I am a new network administrator for a larger company that is planning on moving to a new building. Currently I am working on designing a layout for each office, as well as the warehouse in terms of how everyone's printers and PC's will be hooked…
Brendan
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Disk iops vs latency

I am trying to understand the diference between iops and latency, this is my question: If an hypothetical disk had 2 io per second, then its latency would be 0.5 seconds?
Javier Cintrón
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Does packet size influence the response latency?

I am testing my web application locally against an amazon micro database thats situated in north virginia. I live in Groningen the netherlands. When i send a select query over the public internet it takes 2616(ms) to return a resultset of 42…
Maurice
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HAProxy - http log and TTFB discrepency

I am noticing a large discrepancy between TTFB in my browser networking tool and the HAProxy logs. HAProxy will say the request returned in 29 ms for example, but the browser reports anywhere from 50-600ms. I'm noticing this when traffic is the…
FinDev
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Onboard ethernet versus Intel NIC

I would need some recommendation about the benefits of using a dedicated Intel Ethernet card versus simply using the integrated Ethernet of the motherboard. The typical use case would be the following: Payload of around 100 KB per…
Henry
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Which values for Netem to emulate WAN?

I am developing a distributed application, which I'm currently running on a cluster of Ubuntu VMs over LAN. I'd like to evaluate the performance of my application over WAN. So I decided to use Netem and tc to add network delay, etc. . My problem is…
ePezhman
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syslog-ng: How to reduce high latency when forwarding logs to a syslog tcp consumer?

UPDATE 2: I've answered this via my new question at the link below. The root cause is behaviour by telegraf where by default it disconnects the TCP connection 5 seconds after the last received message. This may be by design, however I have an issue…
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Test latency from NFS to a NFS-client

My team opted for a self build NFS server (using an EC2 instance to serve the other instances), instead of using AWS EFS. We would like to test the latency that our NFS has, then to compare it versus the EFS. Is there a way/tool to test latency of…
0diseus
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How to locate a server geographically from URL

In order to minimize latency for HTTP GET/POST requests, I want to setup a linux box near the server. Suppose for example the server is https://cdn1.telesco.pe I've tried with traceroute and whois. i.e. running traceroute in theory returns the ip of…
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Mirroring Traffic with Nginx(to increase avaliablity and decrease latency )

I need to duplicate/mirror the traffic comming to my server. I mean, I have N backend servers A1 A2 ... An(n>=2) and a nginx as reverse-proxy&load-balancer. All the traffic comming to Nginx redirect to both Ax and Ay(x!=y) in parallel, if one of the…
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IRP_MJ_WRITE latency up to 15 seconds

We have written an application that performs small (22kB) writes to multiple files at once (one thread performing asynchronous queued writes to multiple locations on behalf of other threads) on the same local volume (RAID1). 99.9% of the writes are…
racitup
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How to minimize ecs autoscaling reaction time from terraform?

When you create an ECS autoscaling policy, two alarms tag along with it: one for scaling up ("out"), one for scaling down ("in"). The scale-out ones I see created appear to sample CPU utilization (or the metric of interest) every minute, and only…
Jonas Kölker
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finding which tier 1 or isp to connect to to reduce latency

I am looking to connect to 4 location p,q,r,s. I a ntrying to find the set of locations where I should connect to (isp or pop) to minimize latency . Is it lower latency to connect to a tier 1 network which would connect to 4 ip p,p,r,s ? Is there a…
roller
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Is there a recommended timeout limit to for a web client to keep under when making a synchronous backend request?

We have a somewhat special use case where we are allowing a user to still make a rather slow/large backend http GET request in a synchronous manner (until we implement async systems). The website would likely hang for a few seconds. Are there any…
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