[Pkg-xen-devel] Re: Bug#390862: -bigmem version of xen kernels is
pasik at iki.fi
Wed Dec 13 08:36:28 CET 2006
On Wed, Dec 13, 2006 at 09:19:12AM +0200, Pasi Kärkkäinen wrote:
> On Tue, Dec 12, 2006 at 03:59:13PM +0100, Ralph Passgang wrote:
> > Am Dienstag, 12. Dezember 2006 10:54 schrieb Nikita V. Youshchenko:
> > > What about idea not to *add* pae versions of xen kernels, but to *replace*
> > > non-pae versions with pae versions?
> > I don't think that debian should ship only pae-enabled kernels, because this
> > has some disadvantages:
> > - the slowdown, even if it's minimal, I personaly don't want to get forced to
> > use it.
> > - only pae-enabled system can use xen in 32bit mode, cpu's without pae cannot
> > use xen at all! Not every cpu/bios is able to handle pae.
> > (see "cat /proc/cpuinfo" for your cpu and check your bios settings if you are
> > not sure).
> > - I had some trouble with pae on standard server hardware (in combination with
> > xen) in the past. I think pae can make your system less stable (in rare
> > cases).
> > My personal conclussion: pae is only a dirty hack. use it if you must,
> > otherwise a non pae-enabled kernel/os is better.
> > I think debian should normal AND pae-enabled kernels, or maybe have the kernel
> > decice that on boottime automaticly (if that's possible).
> > ah, and I don't get the "distribution compatibiltiy" point.
> > If your domU system is debian based, then you will use the non-pae kernel from
> > etch and all your domUs also can use the same kernel. It doesn't matter if
> > domU is also debian or fedora or something else, they should work with a
> > debian kernel...
> > The same is true for a dom0 based on fedora and debian as domU. Use the same
> > kernel (the one that gets shipped with the dom0 distribution) and use that
> > for your debian domUs, too.
> > For compatibility it's more important that every distribution uses udev (for
> > example) and not the depricated hotplug system.
> > just my 5 cent ;-P
> > --Ralph
> I see it differently; I would like to use distribution/vendor provided
> kernels as much as possible.. saves from a lot of headaches. Redhat/fedora
> kernels for example have a lot of features/patches you don't (yet) have in
> vanilla or debian kernels..
Not directly related to this, but this is why redhat decided to go for
"the decision to only support PAE capable hosts was made at the end of the
FC5 cycle. The majority (if not all) of server in customer
datacenters/environments are PAE capable today and the only edge case for
non-PAE support would have been "older" laptops which do not yet have PAE
capable processors. It also would have been an additional burden for QA/QE
to test/certify older non-PAE capable servers. As the use case for Xen is
certainly geared towards servers and not laptops this made a lot of sense."
/ - \
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