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29
votes
4answers
2k views

Our wi-fi at work is ridiculously slow, will adding more range extenders improve it?

At work, we have two wireless networks (e.g., Work1 Work2); the Work2 is used downstairs and Work1 is used upstairs. However, both are notoriously slow. The connection is better when we are wired in, ...
17
votes
7answers
4k views

How fast is 127.0.0.1?

I wonder it it is tied to my NIC at all or if the OS or driver intercepts and immediately returns data sent to the loopback address? Do the electrons actually travel to my NIC then the NIC returns ...
16
votes
3answers
2k views

Troubleshooting Network Speeds — The Age Old Inquiry

I'm looking for help with what I'm sure is an age old question. I've found myself in a situation of yearning to understand network throughput more clearly, but I can't seem to find information that ...
11
votes
11answers
20k views

Will a higher bandwidth Internet connection lower ping response time?

It sounds obvious that a faster connection lowers latency... But I wonder: I am working remotely on a host the other side of the world - light can only travel so fast (1 foot in a nano second) and we ...
7
votes
1answer
526 views

Debugging slow transfer rate from server

I'm trying to explain this as simple but documented as possible. This is not exclusive to this server or my current ISP. I've seen the same exact issue over the years while being with different ISPs ...
6
votes
2answers
285 views

AWS - how to serve faster to oversea users

We have our infras relying on AWS in the us-east-1 region. (EC2, CloudFront, RDS, ElastiCache) We are now having more and more users from the APAC. Users start to complain about network speed to our ...
3
votes
2answers
48 views

Remote Access Server for design software

I am thinking about setting up a server for multiple clients to log in to (2 at the same time max), so that people away from the office can use our (resource hogging/CPU intensive) design software ...
3
votes
1answer
3k views

Can Wireshark help determine cause of latency in remote-desktop connection?

We have a small Remote Desktop farm using Windows Server 2008. We have a gateway and two servers. Most of our users have no issues, but we have two or three that get 1-2 second latency when typing. ...
3
votes
4answers
764 views

What tools should I use to assess bandwidth for web server farm..?

I'm contemplating moving datacentre and I need to know the size of pipe I'll need in order to get a quote. Currently I'm charged on GBs of traffic per month (currently about 42GB inbound - so ...
2
votes
4answers
2k views

rsync with multi-core server should go faster than it goes. Am I wrong?

I'm launching a rsync simple command between two servers. Both servers have two eth interfaces on bonding. When I send a big file from one server to the other with rsync I reach 130M/s transfer ...
2
votes
4answers
2k views

Continuous Bandwidth / Throughput Meter

I am building a wireless link between two points using Wireless-N standard. To determine the best position of the antennas, there is a signal strength indicator on the antennas. The problem is the ...
2
votes
1answer
203 views

How can I increase link speed between two webservers?

There is server A in which there is no physical access, in a datacenter around 500Km away. This server is not ours but we are using one of its webservices. And there is the company's server in our ...
2
votes
3answers
925 views

Why is scp much slower than http?

I have an instance on Amazon EC2 which holds a large-ish file (~180MB). I need to copy that file to my local machine, so naturally I tried scp. After trying multiple times only to get max speeds of ...
2
votes
2answers
50 views

Estimate if the network throughput is reached

I have 2 processes communicating over TCP/IP as following: process A sends 20 KB of data to process B and after some calculations process B sends the response (2KB) back to A. When I run both ...
2
votes
1answer
915 views

How to limit the download speed after first N mb in Squid?

In my network, when someone is downloading big files, the internet speed is going down for everyone else. So what I want to do is, when someone starts downloading a file, he will download first 5 ...
2
votes
2answers
624 views

Linux Experts Riddle: Network output of 10MB/s on 10GB/s NIC

I have two CentOS 6 servers. I am trying to transfer files between them. Source server has 10GB/s NIC nd destination server has 1GB/s NIC. Regardless to the command used nor the protocol, the ...
2
votes
1answer
2k views

VMWare ESXi slow file copy to guest

When I copy a file from a physical Windows 7 machine over to a Windows Server guest on a VMWare ESXi the file copy is fast for a few seconds but then drops down to a crawl of 3Mbps. Everything is on a ...
2
votes
1answer
81 views

Poor network performance on Server 2008 machines

I have a network consisting of about 40 Windows 7 machines (physical) and 2 servers (Virtual, ESX) which are Server 2008 Std ed (one is a SBS 2008 but they're the same 'under the hood'). Network is a ...
2
votes
2answers
147 views

Server co-location in Hong Kong [closed]

We are building a website that need to be dedicatedly hosted at some point. We are physically located in Australia, but the colocation/dedicated hosting is ridiculously expensive in Australia, ...
1
vote
6answers
1k views

How to test the connection speed of a server?

What are the techniques to test the connection speed of a server (in my case, virtual Ubuntu server @ Slicehost)? Bonus points for one liner bash command.
1
vote
5answers
3k views

How to diagnose network speed issues in a Microsoft environment?

I have inherited a Microsoft network / environment with all of the usual culprits: Active Directory, Exchange, Terminal Server, 50 clients, File & Print Server - standard enough office essentials. ...
1
vote
4answers
924 views

Basic traceroute question - good traceroute, but connection times out?

Basic question: if I get a decent ping between hops in a traceroute reading, BUT I'm unable to connect to the host via FTP, what does that imply? By connecting via FTP, I simply mean using FileZilla ...
1
vote
5answers
2k views

Converting MBps to k/s

We're diagnosing a speed problem between our shenzhen office and our asset management server. It seems stupid, but I need to get the data in the same format. How do i convert the MBps that isp's ...
1
vote
4answers
274 views

Increase speed of small office MySQL server

I work in a small development team - PHP/MySQL app. Each in-house developer has Apache/PHP installed and is accessing a Windows 7 box with MySQL 5.1 installed. Box is 32bit, Pentium D, 4GB ram, ...
1
vote
2answers
2k views

Network speed between 2 EC2 instances in VPC

I setup a vpc and launched 3 EC2 instances all in 10.0.0.0/16 subnet. I am wondering how these instances connected to each other, 100mbit, 1000mbit?
1
vote
2answers
929 views

How much the distance and ms can affect on the download speed?

Let's consider A (client) and B (server) where A makes download from B. How much can a bad routing from A to B affect the download speed ? A traceroute from A to B returns a path that is 10 hops ...
1
vote
5answers
405 views

Should I worry about the speed trans-atlantic web access for my users?

Obviously it's just one factor in the mix, but if I host a site here in the UK knowing that the majority of my users are in the U.S., how much weight should I give concerns about access speed for ...
1
vote
2answers
2k views

Does Gigabit degrade all ports to 100 megabit if there is a 100 megabit device attached?

Our company is buying some HP Procurve managed gigabit switches to replace some of our core switches. However, we aren't able to upgrade all of our switches from 100Mb to Gigabit switches. I think I ...
1
vote
2answers
403 views

Slow speed with Cisco 1721

I have a few Cisco 1721s and a WIC-4ESW. I was running another companies home router as my cable router, but decided to turn that into a wireless bridge and use my extra Cisco as my router. I ...
1
vote
3answers
3k views

How to throttle your own internet connection?

I am writing a website and want to test it's speed on slower internet connections. I have the unfortunate first world problem of downloading at 100mbps, how can I throttle my own computer's internet ...
1
vote
2answers
1k views

Increase download speed of ftp server

I have a VSFTPD server running in my machine. The download speed is about 30 KB/s, which is way less than my connection speed. I understand the upload speed of the server affects the download speed on ...
1
vote
3answers
930 views

Full speed internal switch bandwidth but per-port set external bandwidth?

I am in an environment where all the machines are behind a switch that I don't have access to. Each ethernet wall port has limited bandwidth depending on how much has been paid for each port. The ...
1
vote
5answers
755 views

1 file transfer capped at 5Mbps; two parallel file transfers capped at 10Mbps. How come?

We have a case of file transfer speed capping (maximum speed) as follows: 1 file transfer capped at 5Mbps; 2 parallel file transfers (same file) capped at 10 Mbps What can explain such a ...
1
vote
1answer
212 views

How to throttle bandwidth speed from VPS

I was wondering if you can throttle/boost the download speed from my VPS to me, because now and often I download a database which is quite big, typically 5-7GB. My side is quite slow (typically I have ...
1
vote
1answer
586 views

How do I speed up memory mapped files over network? [closed]

Memory mapping a file on a SMB file share causes it to be transferred in its entirety before the call returns. For large files, this causes the application to lock up for a long period of time. How do ...
1
vote
2answers
152 views

Slow local area network speeds

Updated on 2014-10-09 Disclaimer This question is similar to Unexplained slow gigabit network speeds but because the latter is still unanswered after 5 years, and that I think I'm able to add more ...
1
vote
1answer
721 views

How to diagnose PHP server execution times to reduce them?

I am running an API server on Amazon EC2 powered by PHP, and am trying to finetune the performance with a goal of reducing response times. Currently I am testing the performance of the PHP code ...
1
vote
1answer
457 views

How to find why midnight commander is too slow when connecting to a specific server?

I have a quite strange problem regarding the connecting to a remote server. The problem is very annoying when I'm using Midnight Commander (mc), just to scroll or inside the editor. Overall there ...
1
vote
1answer
284 views

Local network speed appears to be being limited

I have a dedicated server setup that has just started causing us issues. Our immediate problem, is that last week, could log into an admin page of one of our websites just fine, now we can't. It does ...
1
vote
2answers
380 views

Is there a way to limit how fast apachebench connects to the server?

I'm trying to stress test a particular PHP script that forces a a very large file to download, but specifically when clients with slow connections are making the request. I also want to concurrently ...
1
vote
1answer
36 views

Measuring network speed between many servers [closed]

I have about two dozen servers. I need to measure the network speed between them. What tool / utility can I use for this case? Because it's a bad idea to do this manual, by iperf, for example. How ...
1
vote
1answer
263 views

XenServer internal network speed

I have just configured a XenServer 6.2.0 (based on CentOS) host in a server with 2 high-end processors, 256 GB RAM and SSD storage. The distribution is up to date. We set up several virtual machines ...
1
vote
0answers
117 views

big speed difference on a network link with and without VPN tunnel

Scenario: We have a network link between two offices. The link is provided by a third party company through a VLAN on their network, but to us it is totally transparent -as if we had a simple ...
1
vote
1answer
135 views

Test site speed

I am test driving an Akmai CDN architecture and before committing to buy, I would like to gauge the real performance gain from the acceleration feature. What would be the best MO for doing speed ...
1
vote
1answer
331 views

Why nfs transfer speed is slower than http?

Consider I have a large file on my nfs server. The server and my desktop is connected by 100mbps network. If I mount a directory on my desktop and then try to copy a big file to local fs I have speed ...
0
votes
2answers
116 views

How can I find my peak bandwidth usage over a period of time?

I am about to change Dedicated Server providers. My current provider says the uplink is 500M. The (potential) new host offers by default a 100M uplink and charges an extra $100/Month for a Gigabit ...
0
votes
3answers
249 views

network speed is slower than I expect

We have a network with what seems like 100MB equipment everywhere but there are problems with the slow network. I tried to do a simple test to test the speed. From a Win7 computer I mapped a drive on ...
0
votes
3answers
94 views

Why aren't local requests almost instant?

This is purely out of curiosity, but with every local server I've ever setup, there has always been a 0.5-2 second delay until pages are displayed. Just as an example, I've setup a completely blank ...
0
votes
2answers
488 views

Auditing bandwidth of remote sites

I would like to do an automatic audit of bandwidth of my remote offices. I understand that there are many websites where I could ask each user to go to a webpage and run the test. I was hoping there ...
0
votes
3answers
482 views

testing network connectivity on a server with Gigabit Ethernet

I have a box with Gigabit Ethernet, and I'm unable to get past about 200Mbps or 250Mbps in my download tests. I do the tests like this: % wget -6 -O /dev/null --progress=dot:mega ...