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

From: Yan Li <elliot.li.tech@gmail.com>
To: Cristi Magherusan <cristi.magherusan@net.utcluj.ro>
Cc: Yan Li <elliot.li.tech@gmail.com>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
	"H. Peter Anvin" <hpa@zytor.com>,
	joerg.roedel@amd.com, rjmaomao@gmail.com,
	Yinghai Lu <yhlu.kernel@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	nancydreaming@gmail.com
Subject: Re: [PATCH 1/2] VMware guest detection for x86 and x86-64
Date: Thu, 25 Sep 2008 08:23:33 +0800	[thread overview]
Message-ID: <20080925002333.GD21049@yantp.cn.ibm.com> (raw)
In-Reply-To: <1222279994.27604.2.camel@localhost>

On Wed, Sep 24, 2008 at 09:13:14PM +0300, Cristi Magherusan wrote:
> > > We can also use this feature to force the HZ value to 100 or 250 at most
> > > when running in a virtual environment, since VirtualBox had some issues
> > > with this by taking a lot of CPU time when the HZ was set to 1000.
> > 
> > That's good. But this function is used for detecting VMware guest
> > only.  Do you think VMware also suffers from this problem?
> > 
> I don't know for sure about VMware, but someone who has it installed can
> try it. I had this issue with a CentOS 5-server virtual machine
> downloaded from http://www.thoughtpolice.co.uk/vmware/
> 
> The fix consisted in using a kernel compiled with the HZ value set to
> 100 instead of the default which was 1000.

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?

-- 
Li, Yan