Questions tagged [latency]

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

Filter by
Sorted by
Tagged with
0
votes
2answers
55 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....
1
vote
0answers
23 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
1answer
46 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 ...
0
votes
0answers
41 views

Will using a private VPC for a MongoDB EC2 reduce latency?

I'm currently using Lambda functions to access an EC2 instance in the same region as the Lambda functions (us-east-1). The EC2 instance is currently accessed via a public domain (e.g, mongodb://...
0
votes
0answers
32 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....
1
vote
2answers
135 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 ...
0
votes
1answer
62 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 ...
-2
votes
2answers
51 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 ...
0
votes
1answer
48 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 ...
0
votes
1answer
48 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 ...
0
votes
0answers
56 views

How to reduce the redirect latency of Apache and WordPress?

I try to test the redirect of my server. I input the URL www.datanumen.com/sql-recovery in https://httpstatus.io/. Based on the result: Redirect from http to https is performed by Apache, latency is ...
0
votes
0answers
24 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 ...
0
votes
1answer
63 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 ...
-1
votes
2answers
33 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 ...
6
votes
5answers
2k 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 ...
0
votes
0answers
15 views

How to reduce global network latency to a server to a service with TCP connection?

I'm looking for a solution to reduce latency to a server that is running a service in a specific port, this service can not be scaled because all objects run in-memory (java-based) and the application ...
1
vote
0answers
22 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 ...
1
vote
1answer
79 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 ...
0
votes
2answers
272 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 ...
1
vote
2answers
456 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 ...
1
vote
1answer
852 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 ...
0
votes
0answers
25 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' ...
0
votes
0answers
40 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. ...
0
votes
1answer
193 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 ...
-1
votes
2answers
133 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?
0
votes
0answers
94 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 ...
0
votes
1answer
137 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 ...
1
vote
0answers
190 views

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 ...
1
vote
1answer
581 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 ...
5
votes
0answers
126 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 ...
1
vote
1answer
941 views

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 ...
-1
votes
1answer
35 views

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
0
votes
1answer
165 views

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. ...
1
vote
1answer
66 views

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 ...
1
vote
0answers
26 views

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?
1
vote
1answer
414 views

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 ...
1
vote
0answers
113 views

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 ...
1
vote
1answer
25 views

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 ...
1
vote
0answers
147 views

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’...
4
votes
1answer
466 views

Using tc to decrease bandwidth to a specific destination address

I am trying to find the shortest path between two hosts H1 and H2 using Dijkstra code. Setting a condition in one of the switches on that path. the condition is: if the packet sending to H2 then ...
0
votes
2answers
28 views

If my database has to stay in one region, is there much point distributing my API across several?

We currently have an API and database in Australia, and are attempting to reduce latency in other countries. Coming to grips with the CAP theorem for synchronized databases is probably a little out-...
0
votes
1answer
414 views

App Engine high latency

Hi we have an static web page using Smarty, we want to migrate it from our private web server on Compute Engine to App Engine. We did made the migration but on App Engine we got a latency of 3 sec to ...
0
votes
0answers
185 views

Delay on NFS mounts

My setup: 3 machines, 2 client, 1 server. The server is redhat 7.6, the clients are ubuntu server 18.04.2. The mount is a few dozen TB, the files placed on the clients are a few 100Gigs each. The ...
1
vote
0answers
146 views

Azure App Service / Postgresql high latency

We have an very simple Azure App Service application using Django (Python) running in West EU Region. The Service Plan for this Service is P1v2 (production plan). The Postgresql is configure with ...
2
votes
0answers
527 views

Hyper-V inconsistent/high latency between two VMs on the same vSwitch

This is a clean installation of Windows 10 1903 with Hyper-V, though I've experienced this in previous versions of Windows 10. Add a private vSwitch (so, not tied to any physical network adapter). ...
0
votes
1answer
34 views

What is the fastest posible way to comunicate to a server on Amazon EC2?

I need to communicate via WebSockes and normal HTTP. I am trying to save some microseconds. I have already done: I got an instance at the same Amazon EC2 zone. The ping is 1 millisecond. I have ...
0
votes
0answers
63 views

Latency jumps in first, middle and last mile of path

I work for SD-WAN company providing an all in one solution edge router(Like FORTINET but not FORTINET). We have one customer in particular that has such a hard time with our services i.e. gift card ...
1
vote
0answers
315 views

NPing gives significantly less time on `TCP Connect` than `TCP`

I'm using NPing (NMap's pinging tool) to measure latency on specific servers that may not respond to ICMP. Also, servers do not usually run HTTP(S) and I only check latency on a specific TCP port ...
0
votes
1answer
59 views

One machine's network usage can increase latency for everyone sharing the same ethernet switch

I'm managing an office network of about 20 computers, which all share a common ethernet switch (unmanaged), which is then connected to the ISP's cable modem/router combo. Every now and then someone ...
2
votes
0answers
1k views

Adding some delay to a specific port on localhost using tc and netem

I'm going to simulate a network latency on three different ports of local host by using tc (traffic control for Linux) commands. I run the following code: !/bin/bash tc qdisc add dev lo root handle 1:...

1
2 3 4 5
7