Re: [PATCH 1/2] VMware guest detection for x86 and x86-64

Bernd Eckenfels
2008-09-25T01:28:20Z

In article <20080925002333.GD21049@yantp.cn.ibm.com> you wrote:
> Oh I never heard about this. I've been using several VMware VMs
> (combined RHEL and SLES and Debian) but haven't seen such
> issue. What's the symptom?

Having a high HZ slows down VMs and also leads to tick loss (time drift). HZ
100 or 250 is recommended by most Vendors.

I think some distributions use the reduced HZ value by default anyway, so
you might never had a problem with this.

It is also only a problem with system load and timekeeping, which is not
always obvious. When running a lot of nearly idle VM Guests you might see
it.

Gruss
Bernd