Horton

Re: What X86/X64 OS's do we need coverage for?

Matthew T. O'Connor <matthew@zeut.net>

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From: Matthew O'Connor <matthew@zeut.net>
To: Devrim Gündüz <devrim@CommandPrompt.com>
Cc: Larry Rosenman <ler@lerctr.org>, "'Joshua D. Drake'" <jd@CommandPrompt.com>, pgsql-hackers@postgresql.org
Date: 2007-04-06T07:53:48Z
Lists: pgsql-hackers 
Devrim Gündüz wrote:
> Hi,
> 
> On Fri, 2007-04-06 at 01:23 -0400, Matthew T. O'Connor wrote:
>> The other thing to consider is that CentOS 5 has Xen built right in,
>> so you should be able run VMs without VMWare on it. 
> 
> ... if the kernel of the OS has Xen support, there will be no
> performance penalty (only 2%-3%) (Para-virtualization). Otherwise, there
> will be full-virtualization, and we should expect a performance loss
> about 30% for each guest OS (like Windows).

I may be wrong but I thought that the guest OS kernel only needs special 
support if the underlying CPU doesn't have virtualization support which 
pretty much all the new Intel and AMD chips have.  No?