Hi,

After some tests with VNUML tool, I experimented some problems when using
memory sizes of 256M or bigger.

Basically when I start a virtual machine assigning it 255M (with mem=255M
line option) everything works, but when using 256M or more, the virtual
machines hangs during startup after showing "Mounted devfs on /dev" message.

These are the normal startup messages:
...
Console initialized on /dev/tty0
Initializing software serial port version 1
 /dev/ubd/disc0: unknown partition table
VFS: Mounted root (ext2 filesystem) readonly.
Mounted devfs on /dev
line_ioctl: tty0: ioctl KDSIGACCEPT called
INIT: version 2.84 booting
Activating swap.
Checking root file system...
fsck 1.27 (8-Mar-2002)
....

I have made some tests directly with uml using Debian-3.0r0.ext2
rootfilesystem (VNUML root_fs are derived from it) and a 2.6.12.3 guest
kernel:

  > linux mem=233M ubd0=Debian-3.0r0.ext2 root=/dev/ubd/0

And the behaviour is the same. However the limit in this case is 233M.

Any idea or hint about where the problem could be located?

Thanks in advance,
David Fernandez
Technical University of Madrid




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