OpenGL ES support for SDL front-end, additional framebuffer device options for early boot display without using legacy VGA emulation Live migration support for TPM TIS devices, capping bandwidth usage during post-copy migration, and recovering from a failed post-copy migration. Linktropy WAN Emulators. High-precision emulators for simulating links up to 1 Gbps: Linktropy 5510. MAC address MPLS label Any arbitrary packet field: Bandwidth emulation: 300 bps to 1 Gbps (depending on model) 300 bps to 1 Gbps (depending on license) 100 bps to 40 Gbps (depending on model and license).
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When coming up with designs for different networks, I’ve found that more often than not the people from ‘the business’ or the people writing the applications put little or no thought into how their software may operate over a network. The requirements either never get fully developed during the design phase of the project, sometimes because the application owners aren’t really sure what bandwidth or latency requirements their product needs, or it just gets left out completely. If it works in production, it will definitely work in test right? Sometimes it comes as an afterthought, usually when the project is already complete and in the form of ‘the network is slow and my application is perfect’.
In an effort to try and get ahead of these typical scenarios there are a few options that allow you to give the application and business owners a better idea of how they can expect their product to perform.before. it is put into production and relied upon. You can use these tools to test out anything from data file transfers to database queries to voice/video applications. Apples to Apples The first thing we want to do is to make sure we have as much of an apples to apples comparison as possible.
A good example of what usually happens is the application(maybe a database query for example) gets developed in a 1Gbps lab LAN environment, but when deployed gets put over your DS3 or 100Mbps WAN link between a corporate site and datacenter. You’ve instantly changed the bandwidth(1Gbps to 10oMbps) and the latency (maybe something around 1ms in the LAN and 30ms over the WAN).
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These are going to produce drastically different results, and while it shouldn’t really come as a surprise(you did change multiple variables here, right?), it often does. It’s always better to avoid these headaches in advance if possible. Regardless of the WAN emulation tool you end up using, the end goal should be your testing environment as close as possible to how it will be used in the real world, things like bandwidth, latency, and packet loss will all play a role. The Tools Depending on what OS you are running and what type of environment you have available to you, you have some options. I’ll run through some of the common ones I’ve used, and the more popular ones out there, but this is by no means an extensive list.
The ones that I am going to run through are all free, but there are a number of paid versions out there as well. For the PC Akmalabs makes a program called that runs on Windows. Once installed you define flows of traffic you want to apply the WAN emulation to, and then specify parameters like bandwidth,latency,packet loss,etc.
Any traffic that doesn’t match one of your defined flows will be unaffected by the WAN emulation. In the screenshot below I defined a flow where the source was any IP, and my destination was a computer in the same subnet as the test machine. For the sake of the example, let’s assume you were opening up a new location somewhere in Asia that would have a 2Mbps circuit, and you knew that the latency was about 250ms round trip. Before launching the site you wanted to test some application on your local network to see how it would perform once it is in Asia.
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I set the remote IP and host mask, set a speed of 2Mbps, and 125ms delay in each direction, then clicked Save. This next screenshot shows me pinging from the test machine(Running Network Simulator) to the test IP 10.20.9.11. You can notice that in the beginning of the ping the response times are.
Apple introduced a useful tool with Lion that allows you to test application performance under various network conditions. The Network Link Conditioner (NLC) is primarily designed for testing iOS apps, though it can also be used for testing websites via Safari in the iOS simulator. Once you install XCode on Lion, you will find the NLC preference pane installer located within /Developer/Applications/Utilities/Network Link Conditioner/.
A reboot is required before the NLC daemon will run. Once you have installed the Network Link Conditioner you can find the NLC icon in the “other” section of the system preferences. Once activated the NLC tool applies to the network interface of your Mac so it will impact ALL traffic on your computer when you turn it on. The nice thing about using NLC is that you can change the bandwidth profile on the fly. The NLC is a nice addition to OS X and might just come in handy when running performance profiling from Lion.