Fedora xen - Dec 2007 - Are 64bit Intel Core 2 Quad fedora 8 supported?

The 64 bit xen host kernel are unstable (timer/scheduling issue?)

So I wonder if this is supported or not. Another Fedora 8 x86_64  
installation on
an Intel Core 2 Duo seems to run flawlessly, except it is running on a  
laptop,
and not meant for server use.

Attached are smolt output.

I would be grateful for any input, this was meant to be a system where  
multiple
services should run (several 64bit F8''s) serving dns, web and mail, and
replace
at least two current lumps of hardware..

regards,
George

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It seems I got little attention with my original post.
The f8 64bit image hangs when starting X. Prior to that
the visual ''wait'' circle keeps running around irregularily
at a lot than normal speed.

I observed the same on multi core AMD running RHEL 4, which
was cured with RHEL 5. So no I am happy on that multi-core
workstation.

But this new server I was trying to set up had definite problems
with the -21 xen kernel. It runs flawlessly with the f8 release
kernel (-23).

For testing, where should I pull down a newer xen-kernel that would
run with a full 64 bit f8 install? I would be happy to be a guinea pig
(as long as I can revert) using this system if I could be pointed to
repositories and forum where I could contribute..

thanks in advance,
George

On Wed, 26 Dec 2007 16:57:32 +0100, George Refseth  
<george.refseth@arxi.no> wrote:
> The 64 bit xen host kernel are unstable (timer/scheduling issue?)
>
> So I wonder if this is supported or not. Another Fedora 8 x86_64
> installation on
> an Intel Core 2 Duo seems to run flawlessly, except it is running on a
> laptop,
> and not meant for server use.
>
> Attached are smolt output.
See original post.
>
> I would be grateful for any input, this was meant to be a system where
> multiple
> services should run (several 64bit F8''s) serving dns, web and
mail, and
> replace
> at least two current lumps of hardware..
>
> regards,
> George
>


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On Wed, Jan 02, 2008 at 04:34:52PM +0100, George Refseth
wrote:
> It seems I got little attention with my original post.
> The f8 64bit image hangs when starting X. Prior to that
> the visual ''wait'' circle keeps running around
irregularily
> at a lot than normal speed.
> 
> I observed the same on multi core AMD running RHEL 4, which
> was cured with RHEL 5. So no I am happy on that multi-core
> workstation.
> 
> But this new server I was trying to set up had definite problems
> with the -21 xen kernel. It runs flawlessly with the f8 release
> kernel (-23).
> 
> For testing, where should I pull down a newer xen-kernel that would
> run with a full 64 bit f8 install? I would be happy to be a guinea pig
> (as long as I can revert) using this system if I could be pointed to
> repositories and forum where I could contribute..
I''m afraid the 2.6.21  series of kernel-xen will be the newest
we release for F-8 and earlier - its in bugfix only mode[1]. If there
is an easy bugfix we can do for 2.6.21 to make it work that''s a
possiblity but we won''t be doing .22 or .23 kernel-xen. I''d
recommend
filing a BZ ticket with as many details of the problem you are seeing
as possible:

  http://bugzilla.redhat.com/

Regards,
Dan.

[1] This is because in Fedora-9 we are radically changing the way we 
    approach Xen kernels
    http://fedoraproject.org/wiki/Features/XenPvops


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On Wed, 02 Jan 2008 16:39:55 +0100, Daniel P. Berrange  
<berrange@redhat.com> wrote:
> On Wed, Jan 02, 2008 at 04:34:52PM +0100, George Refseth wrote:
>> It seems I got little attention with my original post.
>> The f8 64bit image hangs when starting X. Prior to that
>> the visual ''wait'' circle keeps running around
irregularily
>> at a lot than normal speed.
>>
>> I observed the same on multi core AMD running RHEL 4, which
>> was cured with RHEL 5. So no I am happy on that multi-core
>> workstation.
>>
>> But this new server I was trying to set up had definite problems
>> with the -21 xen kernel. It runs flawlessly with the f8 release
>> kernel (-23).
>>
>> For testing, where should I pull down a newer xen-kernel that would
>> run with a full 64 bit f8 install? I would be happy to be a guinea pig
>> (as long as I can revert) using this system if I could be pointed to
>> repositories and forum where I could contribute..
>
> I''m afraid the 2.6.21  series of kernel-xen will be the newest
> we release for F-8 and earlier - its in bugfix only mode[1]. If there
> is an easy bugfix we can do for 2.6.21 to make it work that''s a
> possiblity but we won''t be doing .22 or .23 kernel-xen.
I''d recommend
> filing a BZ ticket with as many details of the problem you are seeing
> as possible:
Thanks for a quick response, even if it doesn''t really help me.
The system also won''t boot in i386 mode with the latest BIOS, so I will
run non-virtualized 64 bit for testing purposes until you have a testable
xen enabled kernel for -25 (?) available and forgo the bug report.

Thanks again,
George

>
>   http://bugzilla.redhat.com/
>
> Regards,
> Dan.
>
> [1] This is because in Fedora-9 we are radically changing the way we
>     approach Xen kernels
>     http://fedoraproject.org/wiki/Features/XenPvops
>
>


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George Refseth wrote:
> The 64 bit xen host kernel are unstable (timer/scheduling issue?)
> 
> So I wonder if this is supported or not. Another Fedora 8 x86_64 
> installation on
> an Intel Core 2 Duo seems to run flawlessly, except it is running on a 
> laptop,
> and not meant for server use.
FWIW: I''m running F8 64-bit 2.6.21-2952, for both Dom0 and one DomU, on
6600/Core 2 Duo, without problems. The DomU is HVM; it was originally PV 
but I gave up on that for complex reasons. Various other (non-Fedora) 
HVM domU''s also work without problems.

Maybe it''s just an issue with quad core. Can you turn off two cores in 
the BIOS?

Evan

I am not running F8, all of my DomUs are HVM, and I am not running
64-bit OSes on any of them, so I was staying out of this one, but I am
running F7 64-bit with Xen kernel 2.6.21-6 on a Core 2 Quad, and since you
are having problems even with 32-bit PV guests, I thought that this might be
useful information.  Perhaps you have some sort of BIOS configuration issue
or something.
	Dustin

-----Original Message-----
From: fedora-xen-bounces@redhat.com [mailto:fedora-xen-bounces@redhat.com]
On Behalf Of Evan Lavelle
Sent: Wednesday, January 02, 2008 12:53
To: George Refseth
Cc: fedora-xen@redhat.com
Subject: Re: [Fedora-xen] Are 64bit Intel Core 2 Quad fedora 8 supported?

George Refseth wrote:
> The 64 bit xen host kernel are unstable (timer/scheduling issue?)
> 
> So I wonder if this is supported or not. Another Fedora 8 x86_64 
> installation on
> an Intel Core 2 Duo seems to run flawlessly, except it is running on a 
> laptop,
> and not meant for server use.
FWIW: I''m running F8 64-bit 2.6.21-2952, for both Dom0 and one DomU, on
6600/Core 2 Duo, without problems. The DomU is HVM; it was originally PV 
but I gave up on that for complex reasons. Various other (non-Fedora) 
HVM domU''s also work without problems.

Maybe it''s just an issue with quad core. Can you turn off two cores in 
the BIOS?

Evan

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George Refseth wrote:
> On Wed, 02 Jan 2008 16:39:55 +0100, Daniel P. Berrange 
>> I''m afraid the 2.6.21  series of kernel-xen will be the newest
>> we release for F-8 and earlier - its in bugfix only mode[1]. If there
>> is an easy bugfix we can do for 2.6.21 to make it work that''s
a
>> possiblity but we won''t be doing .22 or .23 kernel-xen.
I''d recommend
>> filing a BZ ticket with as many details of the problem you are seeing
>> as possible:
> 
> Thanks for a quick response, even if it doesn''t really help me.
> The system also won''t boot in i386 mode with the latest BIOS, so I
will
> run non-virtualized 64 bit for testing purposes until you have a testable
> xen enabled kernel for -25 (?) available and forgo the bug report.
You could always try kvm.


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Cheers
John

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On Wed, 02 Jan 2008 18:52:31 +0100, Evan Lavelle <sa212+fcxen@cyconix.com>
wrote:
> George Refseth wrote:
>> The 64 bit xen host kernel are unstable (timer/scheduling issue?)
>>  So I wonder if this is supported or not. Another Fedora 8 x86_64  
>> installation on
>> an Intel Core 2 Duo seems to run flawlessly, except it is running on a
>> laptop,
>> and not meant for server use.
>
> FWIW: I''m running F8 64-bit 2.6.21-2952, for both Dom0 and one
DomU, on
> 6600/Core 2 Duo, without problems. The DomU is HVM; it was originally PV  
> but I gave up on that for complex reasons. Various other (non-Fedora)  
> HVM domU''s also work without problems.
>
> Maybe it''s just an issue with quad core.
Seems to be, or the motherboard and BIOS state at time of boot, except that
I expected the OS to take over not expect any state of the BIOS. I also  
have
no problem running a a new ASUS C90S Laptop with Core 2 Duo, both i386 and  
x86,
  both xen variant (.21-) and non-xen the released and the updated kernels  
(.23.1-42
& 23.9-85). I will continue experimenting on the laptop to prepare for  
virt. on
the server when it can support mother-board and cpu.
> Can you turn off two cores in the BIOS?
>
Not that I can figure out, the BIOS seems to expect the OS to take charge.

George



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