Questions tagged [latency]

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

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S3 static website is loading pretty slow on private window mode only

I'm not sure is this is an S3 issue or something with my website but would like to ask the community for some help. Configuration: I have a static website (about 700KB) hosted on S3. My .css and .js ...
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Intermittent delays in reaching a self-hosted web application

I'm self-hosting a small web application that used to be on a free hosting plan. I've used an old laptop, Dynamic DNS, and port forwarding to make the Django application accessible beyond just the LAN....
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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 ...
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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 ...
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Monitor the delay introduced by network device

I am looking for options to monitor the delay a network device is introducing while forwarding network traffic. Are there any established methods for this? Background: We have observed situations ...
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How to apply `fq_codel` to balance traffic in multiple VLAN connections?

I have an Ubuntu server connected to multiple VLAN networks over a single physical 1 Gbps network port. The network connections are configured via /etc/network/interfaces like this: auto lo iface lo ...
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1 answer
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Best region for server to serve US

I want to create a MongoDB Atlas instance and Google Cloud instance to serve the US region. Is there a rule of thumb which region (east, center, south) or city that is the best choice to serve entire ...
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Traffic shaping and artificial latency per IP in a LAN network using tc/netem

for the last few days I have been trying to setup traffic shaping and artificial latency in a local network. Currently I have an Ubuntu 20.04 PC with 2 NICs, where one is connected to the company ...
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Experiencing latency with haproxy load balancer

I'm experiencing high latency with haproxy load balancer when backend configuration uses private network IP addresses. But when I replace backend server addresses with public IP address or Reverse DNS ...
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2 answers
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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?
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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 ...
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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-...
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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:...
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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 ...
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447 views

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....
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Couchdb 3.1.1 increases disk latency gradually over weeks

I've been dealing with this issue for weeks now. I have the followin scenario: couchdb2.3.1-A <===> couchdb2.3.1-B <===> couchdb3.1.1-A <===> couchdb3.1.1-B where <===> ...
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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 ...
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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....
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How is ping so low, lower than theoretical limit?

According to this article, we would expect a ping of at least 60 milliseconds for 10,000km of distance: Ireland is roughly 10,000km away from California, so this is the ping we would expect. I am ...
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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 ...
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2 answers
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Which AWS EC2 region is the best for hosting a global site? [closed]

I'm looking for a suggestion to choose a region for a global site(Not targetted for any specific country/region). At the moment I'm looking for a simpler solution without having multiple replicas in ...
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1 answer
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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 ...
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finding which tier 1 or isp to connect to to reduce latency [closed]

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 ...
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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 ...
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Latency of memory accesses via interconnectors

I'm trying to compare latencies of different node interconnects for a cluster. The goal is to minimize the memory access latency. I have obtained some benchmarks regarding one of the hardware ...
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Network time metrics

I am trying to get a sense of the different networking metrics and specifically those that are about time. I find myself lost in definitions though. From the research I have done so far I found some ...
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5 answers
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Reducing Latency Between US and India/South Asia or Desktop Access on CentOS 7+ GNOME

We have a server in US DC that is getting accessed from US and India, S Asia and SE Asia. With 128GB RAM, CPU and Cent OS 7 + GNOME desktop and it runs VNC server - the server gets access through VNC ...
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What Might Change With a Debian Server Restart?

My server restarted three weeks ago, and ever since then, we have had some issues, such as a much slower TTFB when accessing the website. It went from less than a second to now more than 5 seconds. I ...
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1 answer
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How do I find out which DNS is being used, or which is the optimal one to speed up website response

I have a server which hosts a website and also multiple API's. Lately when we try to access the website there is a delay that lasts a few seconds before actually loading. I have a good suspicion that ...
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How to find AWS EC2 with lowest latency to another server

I have a client sever located in AWS and I want to reduce latency between his machine and my EC2 instance. I rented two same servers in one availability zone and started sending requests to client`s ...
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Using SSH over high-latency connection (satellite)

Our only available ISP is satellite where we live. We're currently on HughesNet and waiting (very impatiently) for Starlink's beta to send us our invite. In the meantime, I still need to get into my ...
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1 answer
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How to adjust TCP Window Size?

I asked a similar question before, but I believe I was not clear with the details. I'm basically having some problems with my server related to high latency between the server and the clients due to ...
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Which one is faster, USA based AWS Servers vs local servers in Malaysia?

I have been tasked to create a local university database for a Malaysian Client. The client is requesting us to use Amazon Web Services as they bought into the marketing hype. I told them that AWS' ...
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How can I easily (e.g. as easy as rsync or SCP) do a high speed (1gpbs) file upload over an Internet-latency link?

I recently asked a similar question about how to transfer large (many gigabyte to many tens of gigaytes) files over the Internet when latency is high. I got a great answer, but only for downloads. ...
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1 answer
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Minimising latency: AWS and a third-party datacentre

I have a VPS (an EC2 instance) running on AWS-Ireland. I would like to minimise the latency of traffic between this instance and a service provider that has their servers at a third-party data centres ...
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Network Latency (mathematical) relation to bandwidth?

Let's say I have a 1Gbps bandwidth NIC. Can I mathematically derive what would my network latency be just from the bandwidth number?
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Can someone help interpreting high latency / low throughput on a ESXi host (Direct-attached storage)

as a disclaimer - I am not a storage guy, so ELI5 ;) I am looking at a ESXi with direct-attached storage (SAS SSDs and HDDs in a RAID1, different datastores). System X shown on the graphics is on the ...
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Approximate speed-up from TLS 1.2 to TLS 1.3

We're using AWS API Gateway in a single region, which users from all over the world interact with. We've not yet had a chance to do multi-region deployments so some users experience a lot of latency ...
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Troubleshooting low TCP transfer rate behind a router

I’m trying to debug a low tcp transfer rate on a host (“lowHost”). As a reference, i’m comparing it against a second host (“highHost”). I’m making two rate measurements: Downloading a big file using ...
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How to priorize Zoom meetings on a fritz.box?

is there a way to configure the fritz box to priorize zoom calls? Of course I could configure the IP to have higher prio, but this is not solving the issue, that I want to have Zoom only to have real ...
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Linux machine unable to send IPv6 packets for five minutes about once per day [closed]

I am operating a router based on a Linux server running Debian stable (Buster). It uses Quagga to speak BGP4 to four peers (one of which sends the entire Internet routing table for IPv4 and IPv6, the ...
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1 answer
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High ping latency over direct Gigabit Ethernet link on Enterprise-class hardware

FINAL EDIT 7/7 Multiple cable, port, and device substitutions have narrowed this to the Comcast modem, and on all 8 of its Ethernet ports. Given, as the comments say, this is a closed device, and ...
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Add latency to domain

I have a question. Is it somehow possible to add latency to a Ubuntu server when it hits a specific domain? For example it should add 50 ms for google.com And add 20ms for Facebook.com
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Measure packet latency / drop between ingress and egress interface of a rate-limiting pass-through host

Somewhere between my sender and receiver, there is host explicitly limiting my transfer rate. I know it's a Linux host. The ingress interface for my traffic is eth0 and the egress interface is eth1. ...
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1 answer
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CL latency of unbuffered and registered RAM

So AFAIK, registered ram generally has a bit higher latency as going through the registers adds (usually one?) cycle. If I have two dimms of ecc ram, one registered and one unbuffered, and both say ...
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iptables tool to measure latency instead of bandwidth

I'm trying to measure the latency of having a lot of iptables rules. I tried to use iperf but I think that bandwidth is not what i want. Any help with this?
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How can I easily (e.g. as easy as rsync or SCP) do a high speed (1gpbs) file transfer over an Internet-latency link?

A few times per year, I need to transfer massive files (20+GBs) over the Internet (latency 20-100ms), but with reasonably fast connections on the order of 1gbps between servers. Unfortunately, when I ...
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Strongswan high latency on LTE

Allow me to ask for help to solve the following problem with latency. I have a network which is on one side the Strongswan server and on the opposite side are terminals connected through DSL, cable or ...
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1 answer
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Determining on which machine a packet/update arrived first

I have two separate AWS Virtual Machines set up within a region (different availability zones) both are connected via WebSocket (in Python) to a different load balancer (Cloudfront) of the same host ...
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VNET Peering Latency

I’m running a mission critical global three-tier-application (App, IIS & SQL Virtual machines) on same region (Central US), right now, some of the European users are suffering poor performance. I’...

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