Questions tagged [latency]
Latency is the time period between a signal being sent and a signal being received
337 questions
0 votes
1 answer
72 views
API response delay despite fast server-side processing – hosted on DigitalOcean droplet (BLR1) with remote DB on Hostinger
I have a Django ninja server with a 13+ second delay returning data on Postman. Below are logs from the server. [2025-05-26 09:04:23 +0000] [95795] [INFO] Starting gunicorn 23.0.0 [2025-05-26 09:04:...
- 101
1 vote
0 answers
57 views
Windows Server with 10Gbit NIC - Severe Performance Issues over Certain Routes
we recently upgraded our Windows server (hosted by Hetzner) to a 10Gbit/s connection. The server does reach the full 10Gbit/s capacity, and our customers are not reporting any issues. However, we're ...
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0 votes
1 answer
59 views
Handover TCP/UDP connection between client and server [closed]
Let's say Alice wants to retrieve a resource from a large distributed system. Alice connects to Server A, in Frankfurt, but the server is not holding the resource. Anyhow it knows that Server B, in ...
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0 votes
0 answers
33 views
Where can I view latency statistics in Microsoft Azure for OpenAI models?
Google Cloud Platform shows some latency statistics on https://console.cloud.google.com/apis/dashboard?project=[PROJECT_ID]&show=all: Does Microsoft Azure offer something similar to that? I'd ...
- 1,492
0 votes
0 answers
362 views
Ceph High Latency
I am seeking assistance with a challenging issue related to Ceph that has significantly impacted the company I work for. Our company has been operating a cluster with three nodes hosted in a data ...
0 votes
1 answer
225 views
What's the max latency for OpenAI models accessed via Azure with provisioned throughput units?
I'm currently using pay-as-you-go on Azure OpenAI and I'm curious to see how switching to provisioned throughput units would improve the latency. I read: Predictable performance: stable max latency ...
- 1,492
0 votes
0 answers
207 views
Remote desktop session host excessive retransmissions on port 3389 (RDP protocol)
We have an issue with a RemoteApp program we use in my company, one which many users use during the day all connecting to the same RDS Collection. I have run Wireshark on the RDS that hosts these ...
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1 vote
1 answer
451 views
Are very-occasional, very-high read latencies expected from an NVMe SSD under Linux/ext4?
Background context info: I'm working on an application that streams multiple tracks of audio from an NVMe SSD, and I'm measuring the performance of the system to determine how much buffering I need ...
- 1,385
0 votes
1 answer
50 views
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 (...
- 101
1 vote
0 answers
351 views
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 ...
- 111
2 votes
0 answers
1k views
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....
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0 votes
0 answers
463 views
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 ...
- 101
0 votes
1 answer
274 views
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 ...
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-2 votes
2 answers
56 views
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 ...
- 101
0 votes
0 answers
2k views
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 ...
- 187
0 votes
1 answer
101 views
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 ...
0 votes
0 answers
124 views
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 ...
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0 votes
1 answer
681 views
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 ...
0 votes
1 answer
377 views
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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0 votes
1 answer
111 views
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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2 votes
1 answer
3k views
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 ...
- 1,342
-1 votes
1 answer
52 views
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 ...
google-compute-engine
1 vote
4 answers
3k 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?
0 votes
1 answer
1k views
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 ...
- 137
0 votes
1 answer
337 views
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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0 votes
2 answers
3k views
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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0 votes
1 answer
102 views
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 ...
- 11
0 votes
2 answers
2k 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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1 vote
0 answers
117 views
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 <===> ...
0 votes
1 answer
579 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 ...
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0 votes
0 answers
118 views
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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2 votes
2 answers
521 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 ...
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0 votes
1 answer
861 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 ...
- 1,371
-2 votes
2 answers
512 views
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 ...
- 97
0 votes
1 answer
1k 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 ...
- 103
0 votes
1 answer
207 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 ...
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0 votes
0 answers
1k views
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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1 vote
1 answer
1k 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 ...
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-1 votes
2 answers
200 views
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 ...
7 votes
5 answers
6k 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 ...
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1 vote
0 answers
30 views
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 ...
- 83
1 vote
1 answer
638 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 ...
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0 votes
2 answers
2k views
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 ...
3 votes
2 answers
2k 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 ...
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1 vote
1 answer
6k 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 ...
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0 votes
0 answers
78 views
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' ...
- 1,404
1 vote
0 answers
245 views
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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0 votes
1 answer
676 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 ...
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0 votes
2 answers
511 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?
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0 votes
0 answers
448 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 ...
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