Hello! On Thu, Oct 01, 2009 at 05:46:18PM +0200, Samuel Thibault wrote: > Thomas Schwinge, le Thu 01 Oct 2009 17:24:55 +0200, a écrit : > > On Thu, Oct 01, 2009 at 05:23:21PM +0200, Samuel Thibault wrote: > > > Thomas Schwinge, le Thu 01 Oct 2009 17:00:43 +0200, a écrit : > > > > > There's a bootstrap issue: Xen only provides 512KiB of spare bootstrap > > > > > memory, which is not so much to build a pagetable covering 100s of > > > > > MiB. > > > > > > > > But why did it work until now? > > > > > > Because PAE makes page tables twice bigger. > > > > Again: this system was already using PAE. > > Ah, and with PAE you managed to boot with more memory?
Yes.
> How big is your
> kernel? Actually, kernels without debugging symbols & such don't have
> the issue because while 512KiB is a minimum, the granularity is 4MiB, of
> which the kernel may or may not consume a lot. without debugging
> symbols, the kernel typically only consumes 1 or 2 MiB, which leaves
> plenty of room for the pagetable.
All kernel are configured with ``--enable-platform=xen --enable-kdb''.
Here are the sizes of the previous, functioning combo:
-rwxr-xr-x 1 tschwinge tschwinge 2443087 Apr 21 23:11 /boot/gnumach-xen..
-rw-r--r-- 1 tschwinge root 1142784 Apr 21 23:14 /boot/hurd-modules..
And this is the new stuff:
-rwxr-xr-x 1 tschwinge tschwinge 474396 Oct 1 18:01 /boot/gnumach-xen
-rwxr-xr-x 1 tschwinge tschwinge 2437411 Oct 1 16:42 /boot/gnumach-xen.
-rw-r--r-- 1 tschwinge root 1167360 Oct 1 13:40 /boot/hurd-modules
`gnumach-xen' is the stripped version of `gnumach-xen.', without your
patch. Which one I use of these two doesn't make a difference. But
then, are the debug section being mapped at all?
But, and I guess that's what you meant: if I build a ``--disable-kdb''
kernel, which is 386364 stripped, then I can go somewhere above 700, but
below 800 MiB. Your patch is meant to cancel this limitation?
Regards,
Thomas
signature.asc
Description: Digital signature
