dom0 problems

On Thu, 7 Jun 2007 10:51:14 +0200
Manuel Bouyer <bouyerantioche.eu.org> wrote:

> On Thu, Jun 07, 2007 at 01:55:36AM -0600, RJ45 wrote:
> > 
> > 
> > grub does not accept xen.gz
> > 
> > I had to uncompress it first, and then it works
now.
> 
> Strange. I always use compressed kernels with xen.
> 

For what it's worth, I've had the same problem on 4.0beta2
with Xen
3.0.3.  I had enough other stuff to learn how to do that I
didn't fight
it; I simply uncompressed it and went on to other things.


		--Steve Bellovin, http://www.cs.columbi
a.edu/~smb

The grub version installed from pkgsrc is rather old
and I am not sure if it does support booting of compressed
gz images.
Probably Manuel used a more recent version.


Rick


On Thu, 7 Jun 2007, Steven M. Bellovin wrote:

> On Thu, 7 Jun 2007 10:51:14 +0200
> Manuel Bouyer <bouyerantioche.eu.org> wrote:
>
>> On Thu, Jun 07, 2007 at 01:55:36AM -0600, RJ45
wrote:
>>>
>>>
>>> grub does not accept xen.gz
>>>
>>> I had to uncompress it first, and then it works
now.
>>
>> Strange. I always use compressed kernels with xen.
>>
>
> For what it's worth, I've had the same problem on
4.0beta2 with Xen
> 3.0.3.  I had enough other stuff to learn how to do
that I didn't fight
> it; I simply uncompressed it and went on to other
things.
>
>
> 		--Steve Bellovin, http://www.cs.columbi
a.edu/~smb
>

On Thu, Jun 07, 2007 at 08:54:14AM -0600, RJ45 wrote:
> 
> The grub version installed from pkgsrc is rather old
> and I am not sure if it does support booting of
compressed gz images.
> Probably Manuel used a more recent version.

No, I'm using grub from pkgsrc too.

-- 
Manuel Bouyer, LIP6, Universite Paris VI.          
Manuel.Bouyerlip6.fr
     NetBSD: 26 ans d'experience feront toujours la
difference
--

On Thu, Jun 07, 2007 at 04:46:11AM -0600, RJ45 wrote:
> 
> 
> Do you forseen a support for good features like save
and restore
> or migration in hte few next month ?

Well, maybe this works for linux domUs, I've never tried
it.
For NetBSD domUs there is still some work to do and I don't
plan
to work on it in the next months (I'd like to work on amd64
support first).
I'd like to see someone else work on it 

-- 
Manuel Bouyer <bouyerantioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la
difference
--

On Thu, 7 Jun 2007 11:55:46 pm Steven M. Bellovin wrote:
> On Thu, 7 Jun 2007 10:51:14 +0200
>
> Manuel Bouyer <bouyerantioche.eu.org> wrote:
> > On Thu, Jun 07, 2007 at 01:55:36AM -0600, RJ45
wrote:
> > > grub does not accept xen.gz
> > >
> > > I had to uncompress it first, and then it
works now.
> >
> > Strange. I always use compressed kernels with
xen.
>
> For what it's worth, I've had the same problem on
4.0beta2 with Xen
> 3.0.3.  I had enough other stuff to learn how to do
that I didn't fight
> it; I simply uncompressed it and went on to other
things.

This has been the case for me too for quite some time.
Originally it was fine 
but since xen was updated from the original v3 I have had to
uncompress.

It wasn't something that bothered me all that much.

Sarton

On Thu, Jun 07, 2007 at 09:55:46AM -0400, Steven M. Bellovin
wrote:
> On Thu, 7 Jun 2007 10:51:14 +0200
> Manuel Bouyer <bouyerantioche.eu.org> wrote:
> 
> > On Thu, Jun 07, 2007 at 01:55:36AM -0600, RJ45
wrote:
> > > 
> > > 
> > > grub does not accept xen.gz
> > > 
> > > I had to uncompress it first, and then it
works now.
> > 
> > Strange. I always use compressed kernels with
xen.
> > 
> 
> For what it's worth, I've had the same problem on
4.0beta2 with Xen
> 3.0.3.  I had enough other stuff to learn how to do
that I didn't fight
> it; I simply uncompressed it and went on to other
things.

It is a bug of ffs support in GRUB. Loading a gzipped file
results in
different read pattern than uncompressed file, which does
not show this
problem.

(the "blockmap" command in Grub is an useful
diagnostic tool to see the
read pattern, because it is implemented by reading the file
and discarding
the results. You may see that the direct blocks are read
fine, but when it
hits the indirect block, it explodes.)

Pavel

Pavel Cahyna wrote:

>>>> grub does not accept xen.gz

> It is a bug of ffs support in GRUB. Loading a gzipped
file results in

I had to use FFSv1 with 8 kB block size and 1 kB fragment
size on a "small" root 
filesystem. 100 GB / did not boot, 10 GB / works fine.

Martti