Tag Archive | performance

The Great vSwitch Debate – Part 6

OK, so the count is up to five posts on vSwitches. If you’ve not read these posts, I recommend that you go back and do so now. The first five posts were:

Now, in Part 6, we finally start talking about host configurations! I started a thread over on the VMTN Community forums for people to provide input about content they would like to see in this series. VMTN user RobVM asked about a configuration with eight pNICs and iSCSI connectivity, so I’ll tackle that first. But before we do, let me lay some ground rules: Read More…


The Great vSwitch Debate – Part 5

So far, we’ve been through four posts on vSwitches. If you’ve not read these posts, I recommend that you go back and do so now (or you can read this post and then go back – there are not many dependencies). The first four posts were:

Now, in Part 5, I’m going to identify the various “networks” that you interact with in a VMware environment and also provide my recommendation for a configuration with only two pNICs. On with the show! Read More…

Reaction to “Say it isn’t so: Hyper-V and XenServer outperform ESX”

Jason Boche posted an interesting article on his blog today, and I thought I’d offer my thoughts on it.

First, here’s the article from Virtualization Review magazine that started all this furor!

My guess is that part of the difference comes from both Hyper-V & Xen requiring VT capable CPUs (i.e. the VM always runs within a VT jail) while ESX supports binary translation (BT) for some 32-bit x86 instructions. The first generation of chips that supported VT weren’t very good, and VMware’s BT would often do a better job of executing the protected instructions than the hardware assist provided by the CPU. Intel has gotten better in the hardware support for virtualization which is shown in the subject test.

Read More…