Questions tagged [latency]

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

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Server is slow to reply to ping via WiFi interface, but not when sending traffic

The server is Fedora on amd64. It has an eth interface and an wifi one, 5GHz. From a machine in the same LAN, when I ping the server I see: Ping 192.168.2.20 (eth) gives <1 ms Ping 192.168.2.21 (...
Sebastian's user avatar
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IP over LoRa: TCP timeout

I am trying to tunnel IP packets via LoRa. For this I use two devices running Meshtastic. Using ICMP I was able to determine that there is a packet loss of about 30% of the packets and a latency of ...
Marek Küthe's user avatar
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Webapp in Azure huge time network response and latency compared to AWS

I own a pretty simple WebApp, based on php/mysql/redis/nginx. I was trying to move the server to Azure, to see if I could save some money, and today I created a WebApp on Azure using the wizard UI of ...
albanx's user avatar
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Raising priority of network interface interrupts on Ubuntu 22 low latency kernel 5.15

I am running Ubuntu 18 on several servers with the low latency kernel. Previously I have used chrt to raise the priority of interrupt threads for the interrupts related to a specific network interface....
Jonas's user avatar
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getting task cancel error while trying to call web api endpoint (hosted in machine A) from machine B in one of the machine for entire domian

0 I have a web api app hosted over machine A which is called from various machine within a domain. var data = await model.GetDataAsync(); // Throttle the number of requests returned return Ok(data....
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Is it possible to check the latency of internet connection to a of a remote location?

I plan to travel to a distant location and access a high performance computing system (located at where I currently am) while I have arrived at my destination then. However, I am worried about the ...
蕭力諶's user avatar
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What is the recommended configuration for lower latency(TTFB) for Route 53 for CloudFront in future proof way

I'm new to AWS. I use CloundFront for host a fully static website under custom domain name + https. Im trying to understand [without success] how to configure Route 53 to get best result location-wise ...
Igor B's user avatar
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Lowering latency to distant endpoint

I need the lowest possible latency from Bulgaria to Korea. From what I understand, as an individual there is not much I can do to choose which physical cable my internet traffic travels on across ...
angularchobo's user avatar
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network-latency/ping degradation over time correlated with memory fragmentation

There is an Online Charging System (OCS) which handles Diameter Ro and Gy traffic. The OCS receives CCR Diameter messages and answers with CCA Diameter messages. And this response time - latency - ...
Neighbour's user avatar
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How can I geolocate to minimize latency to an AWS instance behind an Amazon Global Accelerator?

There is a server on AWS that I do not control that I need as low latency to as possible. I figured I would experimentally measure my latency from different AWS regions to narrow down the lowest ...
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Tools for testing transfer speed to an already mounted SMB?

Say I have mounted /mnt/mount_test as a samba mount and I want to test the transfer speed from my local system to that mount. I want to know: after the mount is mounted, what transfer speeds am I ...
KoenDG's user avatar
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Find hoster with low latency to a specific webservice

We want to have a server with low latency to the service opensea.io. To find out which hoster is close to their servers we would simply rent a bunch of servers from different hosters and ping the ...
user1000415's user avatar
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Setup new router with SQM - Buffer Bloating solution

Scenario. I'm in Tbilisi, Georgia. I have very high ping to EU servers(100ms+) plus a huge buffer bloating problem, this test gave me the F rank: https://www.waveform.com/tools/bufferbloat I use an ...
MrVerde's user avatar
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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 ...
carlitobrigante's user avatar
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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 ...
andrerpena's user avatar
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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 ...
Brendan's user avatar
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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 ...
Mikko Rantalainen's user avatar
-1 votes
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 ...
william007's user avatar
1 vote
3 answers
1k views

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's user avatar
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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 ...
Maurice's user avatar
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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-...
FinDev's user avatar
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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:...
Henry's user avatar
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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 ...
ePezhman's user avatar
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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....
davidA's user avatar
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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 <===> ...
Roberto Iglesias's user avatar
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1 answer
443 views

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 ...
0diseus's user avatar
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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....
P i's user avatar
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2 votes
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390 views

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 ...
David Callanan's user avatar
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665 views

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 ...
Scott混合理论's user avatar
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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 ...
Bibek Sharma's user avatar
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1 answer
805 views

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 ...
Jonas Kölker's user avatar
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1 answer
175 views

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 ...
roller's user avatar
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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 ...
serverFaulter's user avatar
1 vote
1 answer
783 views

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 ...
Piotr M's user avatar
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-1 votes
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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 ...
Kyriafinis Vasilis's user avatar
6 votes
5 answers
5k views

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 ...
SS891's user avatar
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1 vote
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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 ...
EmL's user avatar
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1 vote
1 answer
178 views

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 ...
EmL's user avatar
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2 answers
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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 ...
Alex Rozhnov's user avatar
2 votes
2 answers
1k views

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 ...
CXL's user avatar
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1 vote
1 answer
3k views

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 ...
Efe Zaladin's user avatar
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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' ...
user1034912's user avatar
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1 vote
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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. ...
john01dav's user avatar
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1 answer
500 views

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 ...
amrk's user avatar
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0 votes
2 answers
334 views

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?
Always_Beginner's user avatar
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338 views

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 ...
MMF's user avatar
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1 answer
362 views

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 ...
pir's user avatar
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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 ...
Tomer's user avatar
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1 vote
1 answer
845 views

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 ...
cilap's user avatar
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5 votes
0 answers
295 views

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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