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

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158 views

SMB Latency Issue with Multiple Users

We have a program that works by being shared over the network as a normal Windows Mapped Drive. You run the program from the mapped drive and it stores its files in flat file databases in that mapped ...
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2answers
214 views

extreme ping latency in WDS network

I have setup a wireless network at work office with the following config: 192.168.1.1: TP-Link 941 Router, Root AP, connected to internet 192.168.1.2: TP-Link 901 AP, WDS Repeater, connected to ...
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483 views

SMB2 over 1GB PTP Link - 10ms latency

Maybe I'm expecting way more from SMB2 than what's realistic. Here is the scenario. Windows 7 Client (Local) A) Win2008R2 Server (LAN -- 1GB, <1ms) B) Win2008R2 Server (WAN -- 1GB, 10ms) ...
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299 views

How to investigate initial server response latency (2.9s) of wordpress/nginx site?

I infer it takes roughly 3 seconds to build HTML and send it back. Is there something obvious that I am missing? Hardware: 2 CPU, 4 GB RAM, 100 gb HDD Stack: Fresh CentOS, Nginx, Wordpress DD perf ...
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2answers
162 views

Amazon Ec2 with LAMP and RDS: how to easely replicate in different regions

I'm a newbie about Amazon cloud and I need an help in order to reduce the geographically latency of a website. I have an Amazon Ec2 with LAMP and RDS in EU Irland. I wish to have the same ...
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499 views

Why my server request takes 28 Second to get response?

I have a Wordpress website on a Godaddy server having at http://kerala.letmeshare.org. When I request to get this website this takes almost 28 sec to get reply. Because of this I made a complete ...
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99 views

Impact of Traffic through the first NIC on the second NIC

I have two NICs on a RHEL 6 server. They are both set at 1GB/sec full duplex. The first NIC has lots of small (< 100 byte) TCP socket writes. The second NIC is used to receive a 50 MB/sec TCP input ...
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1answer
119 views

Microwave Link Latency

An internet provider installed us a microwave link: The issue is that: The ping from our side to the gateway is about 1-2 ms, which is great, but it remains like this for only 12 hours, then it ...
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1answer
916 views

Amazon EC2 and Amazon RDS in Same Network

We have deployed our application in EC2 instance and our database is in RDS which is db.m2.2xlarge. I see some minor slowness in our application when compare to our QA environment where has both ...
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1answer
520 views

Exchange Database Write Latency and ActiveSync - correlation?

We have an increasing number of ActiveSync devices connecting to our Exchange 2010 infrastructure (one primary mailbox server with about 920 accounts and counting; plus a cas/hub in the primary site). ...
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1answer
286 views

OpenVPN + Scrambled patch on Amazon EC2

Yesterday I deployed a regular OpenVPN installation on Debian Squeeze / Amazon EC2. The VPN server is in Singapore and I connect to it from China Mainland. Later on, after some tests I had to start ...
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225 views

My redis' fork time is slow and impact query performance a little. What should I do to check?

I used redis with RDB option only. It used 2GB of memory. When it forked, it used about 10 seconds to completely save the file. When I check up with redis.io site, I found this latency stat: - Linux ...
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1answer
238 views

Unicorn rails server with Apache

I'm looking for the best setup to use in conjunction with Unicorn. Are there clear advantages or disadvantages to using Unicorn rails server with Apache? Should I consider using NGINX? I'm concerned ...
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1answer
201 views

35 times increased latency between data send rate of 1 millisecond vs 100 microseconds. WHY?

Experiment hping -S --data 100 -c 100 10.56.1.2 -i u100 round-trip min/avg/max = 0.5/14.0/15.8 ms hping -S --data 100 -c 100 10.56.1.2 -i u1000 round-trip min/avg/max = 0.3/0.4/4.8 ms Observation: ...
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1answer
552 views

What’s the best switch with bandwidth limiter for my Internet Cafe?

I'm looking for the best switch and router for my internet cafe, that have bandwith limiter and have low latency... Thanks
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0answers
477 views

High latency on domain with CDN

High latency on domain with CDN I have problems with latency on my server, these are the tests I made with blitz.io Latency album http://imgur.com/a/bCmwo I would uploaded images here but it ...
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45 views

SSH Client sporadically hangs for few seconds

On Ubuntu 14.04 LTS when I use SSH client, it hangs sporadically for few seconds every minute or so. no input is lost is just delayed. SSH -V OpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan ...
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2k views

upstream timed out (110: Connection timed out) while connecting to upstream

I have my backend in France and one of my frontend servers is in Japan. This issue doesn't happen with any other of my frontends, only this Japan server, which already has about 2s latency from most ...
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64 views

Latency on intermediate network

For the past week I have noticed that most of the times pages running on my server are very slow. Sometimes they load quickly, but only about 15% of the time. Using an online traceroute tool I have ...
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415 views

how to disable MSI on tg3 driver?

got some new HP DL380p G8 for Centos. What's the correct options to disable MSI for the onboard Broadcom NICs? I tried disable_msi in modprobe.conf.local and it doesn't work. Thanks Will
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381 views

FTP Transfers Slow Between 2 Servers

Between 2 dedicated servers, hosted in 2 different DCs (different companies), the FTP upload speeds are always much slower than the max connection speed. Specs: Windows 2008 on both. Quad core/8 GB ...
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272 views

Amazon's ELB + Instances = High Latency?

I have a single instance running which is sitting behind their load balancer. When I use apache's benchmark utility and point it at the instance the response time is more often than not, under 50ms. ...
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318 views

Network latency in Ubuntu 12.04 LTS

Until recently, my internet connection on my Ubuntu machine was working fine. Then, seemingly out of nowhere, I'm finding severe latency problems. For instance, in my web browser, I'll attempt to ...
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121 views

Website latency and bad tcp packets

I have multiple websites hosted on a Linode VPS and I'm having an issue with one of them: every page that I try to load has about 10 seconds latency. Apache logs are clean and the other websites on ...
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28 views

Impact of Traffic through the first NIC on the second NIC

I have two NICs on a RHEL 6 server. They are both set at 1GB/sec full duplex. The first NIC has lots of small (< 100 byte) TCP socket writes. The second NIC is used to receive a 50 MB/sec TCP input ...
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0answers
19 views

monitor and log speed of a program working with network files

We are using a CAD program on multiple computers in a network. All files and projects are stored on a network storage. The users moan about long waiting times while opening from and saving to the ...
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9 views

Azure Web App Latency

I have a simple Azure Web App setup using a single Standard Small Instance type in Central US region. The site itself is running a node.js website. I noticed google crawl was reporting average ...
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32 views

ping timeouts with light http traffic on T1 connection

I have a T1 over copper connection and started to notice that if I run ping while loading an http page (http://google.com) I get intermittent timeouts in ping. Is this normal? I expected some ...
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46 views

Ping RTTs vs UDP Ping Pong RTTs

Network Topology (wired): ServerA - 1Gb - Switch - 10Gb - Firewall - 10Gb - ServerB Pinging ServerB from ServerA shows round trip times (RTTs) of ~1.2 milliseconds. UDP packet 'ping pong' between ...
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39 views

Increasingly high connect times for static files with Apache

My client is running a PHP application using Apache 2.4.7 and php-fpm. Apache is configured to use mpm_prefork. I am working on optimising load times. I use FireFox dev tools for profiling, and I ...
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133 views

Getting chunks of high ms when pinging local / external IP addresses?

I am having difficulty identifying what a specific problem with one of your vlaned networks. They have a voip phone which regularly cuts out during long phone calls. I have done several ping tests ...
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106 views

Optimizing Pfsense IPSec VPN for a high latency environment

I have two PFsense routers connecting two networks with high latency between them. What can I adjust to improve file transfers between these two networks?
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137 views

Should I be concerned about AWS inter-zone latency?

I have an app hosted on heroku and I just set up an AWS RDS database. The app and the database are in the same region (US East) but I can't tell whether they are in the same zone or not. Server ...
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125 views

Windows Azure VHD Upload Inconsistencies

I'm a little over 2 days deep into a 5 day .vhd upload using the Add-AzureVHD in Windows Azure Powershell and I'm perplexed to the speed (or lack thereof) of this operation. The .vhd is a 300GB file ...
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157 views

MySQL replication across availability zones in AWS resulting in lag

I have 3 EC2 instances, each running MySQL. 2 are slaves replicating from the master. The master is located in the availability zone eu-west-1b. One of the slaves is in the same zone, and the other ...
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67 views

Why is my server so slow to accept connections?

I've noticed that my server seems to be very slow to accept connections - i.e. when analyzing the load time using the Chrome event map, it shows that some tasks can spend multiple seconds waiting for ...
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367 views

CentOS Latency High Troubleshooting

I have two CentOS servers connected via a 10 Gb fiber optic cable with a network emulator connected between them. All three units sit on a desk in the lab. There is also a regular 1 Gbit Ethernet ...
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216 views

Unexplained Packets being dropped

I have two servers one sending large amounts of data to the other, we are noticing that one server is sending data to the other but the receiving server is missing some of the data or packets. I am ...
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63 views

2 cisco 1941's, high latency during low network load

We have a point to point connection between 2 cisco 1941, the weird thing is that during low bandwith usage we experience high latency (peaks of 200+ ms, when 8-20 is normal) we currently use a ...
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92 views

how to determine whether network switching equipment latency is OK for VDI delivery?

Is there a good (proper) way to test whether network switching in place is good enough for VDI delivery? I read a Cisco UCS whitepaper that stated that they observed 3.2 ms latency across their test ...
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39 views

reduce initial SSH communication messages

The situation: we have some manager servers in Japan which connects to servers in Amsterdam. Since the latency between JP and EU could reach 300ms, the initial login can take up to 6 seconds. Although ...
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7 views

Website always takes very long time to load page only in running environment but not local

I'm sorry to upload same article on stackoverflow. I'm web developer in Korea. Because of delays of our web application installed on running server(real, not testing) I'm writing this question. ...