CentOS virt - Nov 2010 - KVM and Windows "/use pmtimer"

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualization/chap-Virtualization-KVM_guest_timing_management.html

Want to get some more people's opinion on this: the above doc says to use
the boot parameter "/use pmtimer" to use the RTC "instead of the
TSC for all time sources which resolves guest timing issues".  One: does
this have any bearing on whether the host has the constant_tsc flag (i.e. are
all the sections that follow "Configuring hosts without a constant Time
Stamp Counter" subordinate to it, or does that just have bearing on power
management on that one CPU listed---AMD rev F)?

Other question: http://support.microsoft.com/kb/938448 implies that for 2003 SP2
"/use pmtimer" shouldn't be needed as it will use the platform
timer (RTC) if you have ACPI or APIC present.  ("By default, Windows Server
2003 Service Pack 2 (SP2) uses the PM timer for all multiprocessor Advanced
Programmable Interrupt Controller (APIC) Hardware Abstraction Layers (HALs) or
Advanced Configuration and Power Interface (ACPI) HALs".)  Anybody have any
experience as to whether this (using ACPI feature in KVM) resolves the timing
issues without needing pmtimer explicitly set?

Thanks,

Eric
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PGP.sig
Type: application/pgp-signature
Size: 203 bytes
Desc: This is a digitally signed message part
URL:
<http://lists.centos.org/pipermail/centos-virt/attachments/20101120/afd240ac/attachment.sig>

Whenever I create a new VM, I use the windows 2003 template and everything
just works. It doesn't matter what OS I use - linux or windows.

If I use a template that matches the OS I'm trying to install, like the
linux templates. It tends to crash.

I wonder if the 2003 template has the right ACPI and APIC emulation...

No need for "/use pmtimer"