Pkg xen devel - Feb 2006 - r48 - trunk/debian

Author: ultrotter
Date: 2006-02-23 12:25:37 +0000 (Thu, 23 Feb 2006)
New Revision: 48

Added:
   trunk/debian/README.Debian
Log:
Add README.Debian with some basic information our users need...


Added: trunk/debian/README.Debian
==================================================================---
trunk/debian/README.Debian	2006-02-22 18:32:20 UTC (rev 47)
+++ trunk/debian/README.Debian	2006-02-23 12:25:37 UTC (rev 48)
@@ -0,0 +1,62 @@
+Xen for Debian
+--------------
+
+* About /lib/tls:
+
+   Since Xen guest machines have to work in non-contiguous areas of memory,
+   they cannot support a segmented glibc efficiently.  If your glibc is
+   segmented Xen will have to emulate the support, with a high performance
+   penalty. To solve this problem you just have to execute this command:
+
+   mv /lib/tls /lib/tls.disabled
+
+   Unfortunately we cannot do this ourselves when you install Xen or at any
+   other time, without breaking the Debian Policy and thus provoke the Wrath of
+   the Gods. We know that this solution is not optimal, especially because
+   every time you upgrade the glibc package /lib/tls will be restored, and
+   you''ll have to
+
+   rm -rf /lib/tls.disabled
+   mv /lib/tls /lib/tls.disabled
+
+   again. We''ll be working towards a better solution, but for now this
is it.
+   Please remember to always keep your system tls disabled.
+
+
+* About the kernel:
+   
+   Unfortunately for now we cannot provide precompiled Linux Kernels with the
+   xen patch applied and configured to work in a Domain 0 or in an unprivileged
+   domain. The only thing we can give you is the patch, which is included in
+   the linux-patch-xen package.  You are expected to install this package,
+   download a 2.6.12 kernel from kernel.org (this is the version supported by
+   xen right now. The patch will make it a 2.6.12.6+xen kernel) and roll your
+   own kernel.
+
+   After you''ve done so you can add a section similar to this one to
your
+   /boot/grub/menu.lst file in order to boot your xen system. (Only grub is
+   supported on Xen systems, if you''re a LILO fan we''re
sorry, there''s no way
+   you can use Xen without switching, and probably there will never be)
+
+   title           Debian Xen+GNU/Linux
+   root            (hd0,0)
+   kernel          /boot/xen.gz dom0_mem=256M
+   module          /boot/xen-linux-2.6.12.6xeno003 root=/dev/sda1 ro
console=tty0 mem=256M
+   boot
+   
+   Of course you can choose how much of your memory you want to give to your
+   Domain 0 (the value in the kernel field gets used, the one in the module
+   field can be larger, just in case you want to increase the amount, without
+   rebooting, later) and you have to supply your kernel path and root device in
+   the module line. 
+
+   We will provide a "roll your own xen kernel" manual and example
config files
+   later on. We also hope to be able to provide complete Xen kernels, sooner or
+   later, so don''t despair! (Well, do, since in the meantime you have
to do it
+   yourself anyway, if you want to try Xen... But don''t give up now,
compiling
+   a kernel is not hard, and trying Xen is worth learning how to do it!)
+
+Kindly yours,
+
+Guido Trotter, for the Debian Xen Team.
+

Am Donnerstag, 23. Februar 2006 13:25 schrieb Guido Trotter:
[...]
> +* About the kernel:
> +
> +   Unfortunately for now we cannot provide precompiled Linux Kernels with
> the +   xen patch applied and configured to work in a Domain 0 or in an
> unprivileged +   domain. The only thing we can give you is the patch, which
> is included in +   the linux-patch-xen package.  You are expected to
> install this package, +   download a 2.6.12 kernel from kernel.org (this is
> the version supported by +   xen right now. The patch will make it a
> 2.6.12.6+xen kernel) and roll your +   own kernel.
> +
> +   After you've done so you can add a section similar to this one to
your
> +   /boot/grub/menu.lst file in order to boot your xen system. (Only grub
> is +   supported on Xen systems, if you're a LILO fan we're sorry,
there's
> no way +   you can use Xen without switching, and probably there will never
> be) +
> +   title           Debian Xen+GNU/Linux
> +   root            (hd0,0)
> +   kernel          /boot/xen.gz dom0_mem=256M
> +   module          /boot/xen-linux-2.6.12.6xeno003 root=/dev/sda1 ro
> console=tty0 mem=256M +   boot
You don't need this "dom0_mem=" and "mem=" settings in
the menu.lst anymore.
xen3 handels dom0 memory automaticly if these settings are not used.

it will give the dom0 all available memory and will balloon out memory for 
domUs when needed (up to the memory limit that is set 
in /etc/xen/xend-config.sxp).

but the rest of the manual is very good, so good work!

--Ralph