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

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Message-ID: <20080925002333.GD21049@yantp.cn.ibm.com>
Date:	Thu, 25 Sep 2008 08:23:33 +0800
From:	Yan Li <elliot.li.tech@...il.com>
To:	Cristi Magherusan <cristi.magherusan@....utcluj.ro>
Cc:	Yan Li <elliot.li.tech@...il.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	joerg.roedel@....com, rjmaomao@...il.com,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>, nancydreaming@...il.com
Subject: Re: [PATCH 1/2] VMware guest detection for x86 and x86-64

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
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