Like every other website on the planet, SmallNetBuilder uses cookies. Our cookies track login status, but we only allow admins to log in anyway, so those don't apply to you. Any other cookies you pick up during your visit come from advertisers, which we don't control.
If you continue to use the site, you agree to tolerate our use of cookies. Thank you!

Router Charts

Click for Router Charts

Router Ranker

Click for Router Ranker

NAS Charts

Click for NAS Charts

NAS Ranker

Click for NAS Ranker

More Tools

Click for More Tools

Other Features

Virtualization and Memory Considerations - more

Figures 4 and 5 show Write and Read performance when the virtual machine has only 256MB of RAM as opposed to the virtual machine having 512MB of RAM as used in the head-to-head comparison with the physical machine.

In Figure 4 showing Write Performance, the virtual machine with 512MB RAM clearly outperformed the virtual machine with 256 MB RAM at smaller file sizes, with nearly identical performance as file sizes increased. Again, this effect is primarily due to write caching, so with less memory allocated, the cache performance boost declines sooner, resulting in lower performance for the 32 MB file write.

Write RAM comparison
Click to enlarge image

Figure 4: Write performance of 256MB RAM virtual machine vs. 512MB RAM virtual machine

Read performance in Figure 5 between the 256MB virtual NAS and 512MB virtual NAS shows a tradeoff, with higher performance at lower file sizes for the larger memory virtual device and lower performance for the higher file sizes for the larger memory virtual device. (The 128 MB data point for the 256 MB plot line is another measurement glitch. The real performance is more in line with the other data points.)

Read RAM comparison
Click to enlarge image

Figure 5: Read performance of 256MB RAM virtual machine vs. 512MB RAM virtual machine

Virtualization and Network Interface Considerations

Network performance is a key aspect to optimizing server functionality. For a server to provide value, it must provide high throughput to clients, data stores, and other servers over a high-speed network. In addition to adding RAM to a Host physical server, there are multiple different options to optimize the performance of virtual machines.

Understanding that Guest operating systems interact with the computing hardware through the virtualization layer explains how optimized virtual drivers can improve the performance of a virtual machine. As discussed in my last article, VMware has packages of high performance drivers, called "VMware Tools," for Windows, Linux, FreeBSD, and Netware Guest operating systems that improve the performance of network interfaces and disk I/O operations.

In addition to installing VMware Tools, performance may be enhanced on a high network traffic server by installing additional physical NICs on the Host machine. These additional NICs can then be dedicated to specific virtual machines. I tested this functionality by adding another NIC to my Host server, and configured the network settings to map each physical NIC to different virtual switches within VMware Server's configurations, as shown in Figure 6.

Vnet settings

Figure 6: Virtual network settings in VMware

More Stuff

Wi-Fi System Tools
Check out our Wi-Fi System Charts, Ranker and Finder!

Support Us!

If you like what we do and want to thank us, just buy something on Amazon. We'll get a small commission on anything you buy. Thanks!

Over In The Forums

Hi,I have dumb IPTV set top box, which must be connected in WAN networkIs it possible to configure router in this way? I am using Linksys EA6400 with ...
Hi everyone!I updated my ASUS RT-N66R router's firmware today. I don't remember what it was, but it is now version 3.0.0.4.382_50702. After it finishe...
What is the insertion loss between coax in and TV/STB out?Doe it block (filter) MOCA on the TV/STB out port?
Newegg coupon code "emceerp47" $50 offhttps://www.newegg.com/Product/Prod...-WirelessRouters-_-33122818-S2A2C&ignorebbr=1Only shows 5 in stock and exp...
I was wondering if the list prohibits the device from moving to nodes aka it keeps the device on the Router only ? or the devices that are connected t...

Don't Miss These

  • 1
  • 2
  • 3