I've run Ubuntu 7.1.0 with VMI and it works great. The time keeps up without having to mess with NTP or anything. I would recommend running NTP in production though. You can get a maximum of a 30% performance gain, but it's probably unlikely.
Just check the box for VMI under advanced options when the VM is down and you should see VMI if you grep for it in /var/log/messages after it comes back up.
Any advantage that you know of with running paravirtualization on a Windows based system?
No windows paravirT yet.
I get a message that my CPU does not support long mode when enabling it for Ubuntu server 7.10/amd64. Not sure whether this is BIOS config problem (on DL380G5) or what.
Got the same problem with 64-Bit Ubuntu and paravirt. (... doesn't support long mode) here. Any solutions yet?
You have to use an AMD 64-bit CPU or and Intel CPU that suppots EMT64 (VT). We use the Intel Quad-core E5335's, and HP does not enable the VT emulation by default. Had to go into the BIOS and enable it. Now we can run 64-bit VMs.
Hope that helps!
I double checked this on all our three machines, "Intel (R) Virtualization Support" (original quote from BIOS) is enabled.
To be sure I downloaded the VMware CPUid utility, it reports the following:
Reporting CPUID for 8 logical CPUs...
All CPUs are identical
Family: 06 Model: 0f Stepping: b
ID1ECX ID1EDX ID81ECX ID81EDX
0x0004e3bd 0xbfebfbff 0x00000001 0x20100000
VT is enabled on this CPU bin
Vendor : Intel
Processor Cores : 4
Brand String : Intel(R) Xeon(R) CPU E5345@2,336 GHz
SSE Support : SSE1, SSE2, SSE3, SSSE3
Supports NX / XD : Yes
Supports CMPXCHG16B : Yes
Supports 64-bit Longmode : Yes
Supports 64-bit VMware : Yes
So everything should be okay, I assume. VMI support is working fine with 32bit Linux (dmesg says the kernel has recognized and is using vmi support). 64bit systems are running fine, too (both Linux and Windows2k3), but Linux fails booting when activating VMI support for the virtual machine. I tried that with both 64bit Kubuntu 7.10 and CentOS 5, results are the same.
By the way, I tried deactivating VT support in BIOS, the CPUid reports then correctly: "Supports 64-bit VMware: no (may be enabled by BIOS option)".
So is this a bug or am I missing something?
Additional info: motherboard is an INTEL S5000PAL. BIOS is up to date.
There's no 64bit support for VMI.
Is there any document stating where exactly can you use paravirtualization? It's the first time I got the message stating 64bit paravirt for Linux is not available. 32bit is working fine in my case, while 64bit isn't - just to clarify.
Check out kernel.org for information on the latest additions to the Linux kernel. If you are looking specifically at one distribution you should check that distributions documentation. But kernel.org is the definitive location for kernel answers.
Edward L. Haletky
VMware Communities User Moderator
Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education.
CIO Virtualization Blog: http://www.cio.com/blog/index/topic/168354
As well as the Virtualization Wiki at http://www.astroarch.com/wiki/index.php/Virtualization