poor IIS performance on VM

Hi Experts,

we have converted a old server WIN2008 to a VM.
All works but the IIS performance is poor.
The users from outside can connect but very slow and sometimes with interrupts.

Do you have any ideas ?

The VM has 4GB RAM and 8 vCPUs. It is a 32bit system.
We use VMWARE 6.0 with NFS storage on NETAPP.
Before the migration (P2V) the IIS was much more quicker.
Eprs_AdminSystem ArchitectAsked:
Who is Participating?
Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
*ALWAYS* use sockets!
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Comparing physical versus virtual servers, is never a good idea, performance will ALWAYS be better on the physical!

But if it causes performance, or service issues, in your case, this is not good for service.

But 8 vCPU sockets could be excessive ?

How many concurrent users access the server?

Why have you decided on 8 vCPUs ?

also how are these vCPUs provisioned, as sockets or cores ?

see this recent Question on EE, I answered


also see my EE Article

HOW TO:  Performance Monitor vSphere 4.x or 5.0
Eprs_AdminSystem ArchitectAuthor Commented:
I changed back to 4 sockets vCpus
Some old services also took performance of one complete core.

Now is better.

I have to wait until tomorrow, when user connect to it.
Problems using Powershell and Active Directory?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Eprs_AdminConnect With a Mentor System ArchitectAuthor Commented:
OK it is solved now.
Again problems with the nic driver of VMXNET3.

I will change all nic to the E1000 driver !!
Eprs_AdminSystem ArchitectAuthor Commented:
VMXNET3 driver has problems, when you use webservers and application servers and DB-servers.....
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would qualify that with VMware Support!, before you go crazy and change all over
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.