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RE: [Xen-users] Xeon processor and no VT?

  • To: "Suman K" <kanugantisuman@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Roger Klorese" <roger@xxxxxxxxxxxxx>
  • Date: Sun, 29 Apr 2007 22:05:55 -0700
  • Delivery-date: Sun, 29 Apr 2007 22:05:04 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AceK4IvM4begxpgcSZiIQruEtrlqrgABIqIg
  • Thread-topic: [Xen-users] Xeon processor and no VT?

Usually if the BIOS does not have an option, VT is off and cannot be
enabled.  Check with HP if there is a newer BIOS that allows enablement.

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Suman K
Sent: Sunday, April 29, 2007 9:32 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Xeon processor and no VT?

I have xen working on Intel(R) Xeon(TM) CPU 3.40GHz, its a HP xw6200
workstation. I thought all the Xeon processor come with VT. Here is a
I search numerous pages from Intel and everything says Xeon processor
supports VT. This machine seem to have a E7525 chipset.
Still, xen complains about no VT. I am just so confused at this point
and trying to find out if I have the wrong processor or missing
something. I search all BIOS, it does have an option for VT enable
disable but does have HT.
I would really appreciate any ideas or experience in this regard? 


Suman K
Linux Engineer
San Diego, CA

- Powered by Linux

----- Original Message ----
From: Tim Post <tim.post@xxxxxxxxxxx>
To: Steve Wray <steve.wray@xxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Sunday, April 29, 2007 8:39:25 PM
Subject: Re: [Xen-users] xen 2.0.6, on_crash = 'restart' not restarting
after crash

On Mon, 2007-04-30 at 09:35 +1200, Steve Wray wrote:
> Hi all,
> We have a xen instance (under xen 2.0.6) thats pretty unreliable; the
> domU crashes fairly regularly.

If you must use Xen v2, try 2.0.7 (or the last 2.0-testing Mercurial).
2.0.7 isn't the most feature packed release but it is extremely stable.

I'd really recommend upgrading to 3.0.4-testing or 3.0.5-testing (I
think its at rc4 now) unless you depend on an older kernel version. I
have some that have to stay at 2.0.7 until I find a better fit for PV
open SSI clusters.

> Yes, we are trying to figure out why, but in the meantime I discovered
> that there is a config option 'on_crash'.
> We've implemented this in the config file for that xen domain and we
> have this in the config file for the domain:
> restart = 'always'
> on_crash = 'restart'

This really depends on Xen's ability to see the dom-u as 'crashed'.
Typical 'crashes' on older kernels don't look much different to Xen than
a running or blocking state.

Examples would be, if its non responsive and shown as running, the guest
is most likely just spiraling out of control.

If its non responsive and blocking, any number of things could be going
wrong, but Xen doesn't see it. Unless its a full out kernel panic, most
likely Xen 2 won't see your guests crash.

Can you give more details of the crash?

> The domain has indeed crashed since this was implemented and did not
> appear to recover, at least not for the 6 minutes we gave it to
> the domain:
> [2007-04-30 09:06:19 xend] INFO (XendRoot:112) EVENT> xend.domain.exit
> ['domUhostname', '14', 'crash']
> [2007-04-30 09:06:19 xend] INFO (XendRoot:112) EVENT>
> xend.domain.destroy ['domUhostname', '14']
> [2007-04-30 09:06:20 xend] INFO (XendRoot:112) EVENT> xend.domain.died
> ['domUhostname', '14']
> [2007-04-30 09:12:03 xend] DEBUG (XendDomainInfo:720) init_domain>
> Created domain=15 name=domUhostname memory=1200
> [2007-04-30 09:12:03 xend] INFO (console:94) Created console id=14
> domain=15 port=9615

> And are there any other things we can do to restart a domain after a

Many people favor some kind of key pairing to enable a centralized
monitor to be able to restart guests in the event of failure, even with
newer versions of Xen, or using the API.

If you aren't depending on a very specific older patched kernel, I'd
just move up to 3.0.4-testing. 3.0.5-testing has been pretty stable too.

Hope this helps,

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