Issues on Windows Server 2012 and 2012 R2 with VMQ and Emulex network adapters

There have been several reports of networking and stability issues on Windows Server 2012 and Windows Server 2012 R2 when deployed on hosts equipped with Emulex NICs.  These issues arise when VMQ is enabled.  The typical symptoms include the loss of network connectivity on one or more virtual machines or an inability to shut down… Read more

Debugging performance issues with VMQ

In my last posts about VMQ (virtual machine queues), VMQ Deep Dive, 1 of 3, I tried to give readers a thorough understanding on the technology and why it was needed. Unfortunately, I still feel like there’s a piece missing around troubleshooting suspected VMQ issues. Therefore, in this blog post I’d like to address these… Read more

VMQ Deep Dive, 1 of 3

Virtual Machine Queues (VMQ) is an incredibly powerful performance technology introduced in Windows Server 2012. A concern we’ve noticed as Windows Server 2012 is increasingly deployed in datacenter environments is misconceptions about VMQ, and even “tribal knowledge” that disabling VMQ solves networking issues. With a set of three blog posts on VMQ, we are going… Read more