Hi Connie,
I investigated a slow behaviour of guest VM (paravirtualized SL 48) in my
host computer (host OS SL53). No serious clue was found still. However I
paid attention in my routine checking of all parametrs for the flag 'vmx'
on host OS and the difference with different versions of kernels.
I am not expert in kernels and I asked who may be already has
experience with such the case.
Actually I do not care if the kernel has small problem to show all CPU
flags.
But if the kernel somehow ignores such flag (or reset it!) - it is more
serious.
Thanks for attention,
Andrey
On Wed, 16 Jun 2010, Connie Sieh wrote:
Date: Wed, 16 Jun 2010 14:09:48 -0500 (CDT)
From: Connie Sieh <[email protected]>
To: Andrey Y. Shevel <[email protected]>
Cc: [email protected]
Subject: Re: Q on the CPU flag 'vmx'
Why do you care if it says "vmx" or not? Does it not work in one of the
cases?
-Connie Sieh
On Wed, 16 Jun 2010, Andrey Y. Shevel wrote:
Hi Andrew,
I would pay attention that in both described cases XEN kernels were used.
Andrey
On Wed, 16 Jun 2010, Dr Andrew C Aitchison wrote:
> Date: Wed, 16 Jun 2010 10:58:44 +0100 (BST)
> From: Dr Andrew C Aitchison <[email protected]>
> To: Andrey Y. Shevel <[email protected]>
> Cc: [email protected]
> Subject: Re: Q on the CPU flag 'vmx'
>
> On Wed, 16 Jun 2010, Andrey Y. Shevel wrote:
>
> > Hello everybody,
> >
> > I just discovered in my CPU
> >
> > model name : Intel(R) Xeon(R) CPU E5430 @ 2.66GHz
> >
> > under
> >
> > [r...@pcfarm-new ~]# uname -a
> > Linux pcfarm-new.pnpi.spb.ru 2.6.18-194.3.1.el5xen #1 SMP Fri May 7
> > 02:05:32 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
> >
> > that there is no flag 'vmx'
> >
> > [r...@pcfarm-new ~]# grep vmx /proc/cpuinfo; echo $?
> > 1
> >
> > At the same time when I boot another kernel
> > 'xen.gz-2.6.18-128.1.1.el5'
> > the flag 'vmx' is in place
>
> Hmm. The flags are indeed different with xen and non-xen kernels.
>
> I guess this is because with a xen kernel you are looking at the
> capabiities
> of the *virtual* CPU, rather than the bare metal processor ?
>
>
--
____________________________________________________________________
NAME: Andrey Y. Shevel (Chevel) : EMAIL: [email protected] \
Computing Systems Department : http://hepd.pnpi.spb.ru/CSD |
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