Hi.
Thanks so much for your advice!
My host kernel in the 64 bit SUSE Linux Enterprise Server is
2.6.16.60-0.30-smp. I also tried Ubuntu 8.04 64 bit, which uses 2.6.24
kernels.
My guest kernel is linux-um-2.6.18.1-bb2-xt-4m in both cases, provided
by VNUML project (compiled for 32 bit). In case I didn't express it
correctly I summarise. (I hope I'm not confusing between the concept of
host (physical kernel) with guest (UML kernel) kernels, is it not?)
Case 1) Host: 32 bits (2.6.24). Guest, UML Kernel: 32 bits.
(linux-um-2.6.18.1-bb2-xt-4m)
Case 2) Host: 64 bits (2.6.24, 2.6.16). Guest: 32 bits. (the same
linux-um-2.6.18.1-bb2-xt-4m)
In both cases the host kernel is not too old (at least in the case of
Ubuntu). VNUML provides a tutorial to compile your own VNUML kernel, so
I'll try downloading a recent image from kernel.org and compiling it
myself and see what happens.
I will also try to see if there is something strange about libraries or
/dev/shm.
Anyway, thanks again for your reply.
Gerson.
Gordon Russell wrote:
Hi.
Having made the swap from 32 to 64 bit hosts myself this month, I have
found them to be very reliable and without the problems you seem to be
happening.
You are using a really old kernel. I suggest upgrading both the host
and guest kernels to something more modern. Previously I had been
using 2.6.7, and this definitely caused problems in the move to 64
bits. 2.6.18 for me ran but had the odd little quirk which made it
problematic. You dont say what version your guest kernel is, but try
to get both updated.
The other thing which caught me out was the uml tools, which I
compiled on another machine. When I upgraded the readline library had
undergone major revisions, and so the tools needed to be recompiled.
Do "ldd" on the tools (like uml_mconsole) to make sure they all link
to current dlls.
You should really have /dev/shm as a tmpfs mount. Never seen a
standard install without this as default (but I use fedora).
I also originally had con2 to 7 in the inittab of the virtual machine.
Why not give all the con2..7 devices a pty? But thats a longshot.
Best of luck.
Gordon.
2008/10/29 Gerson Rodríguez de los Santos López <[EMAIL PROTECTED]>:
1) In case 2, the "linux" process becomes "defunct" according to "ps -e"
output. As a result, the VM does not boot. The key point seems to be the
command line invoked by VNUML presented here (full trace attached in
output.txt):
/daemon: /usr/local/share/vnuml/kernels/linux
ubdb=/root/.vnuml/simulations/dynavnuml/vms/H1/fs/opt_fs
ubda=/root/.vnuml/simulations/dynavnuml/vms/H1/fs/root_cow_fs
hostfs=/root/.vnuml/simulations/dynavnuml/vms/H1/hostfs mem=32M
eth1=tuntap,H1-e1,fe:fd:0:0:1:1
uml_dir=/root/.vnuml/simulations/dynavnuml/vms/H1/ umid=run con=null
con1=pts mconsole=notify:/tmp/vnuml_notify.ctl.X16646
2) I have tried executing the UML kernel myself with that same command line.
After printing "Checking syscall emulation patch for ptrace...missing", the
proccess finishes with no further error message displayed in the console. I
don't even receive an status notification on how the process ends (Stopped,
Aborted or Segmentation Fault).
3) I have also tried executing the following line at
/usr/local/share/vnuml/kernels: "./linux
ubda=../filesystems/root_fs_tutorial mem=32M". The VM starts succesfully and
I can log as root as usual. (May it have something to do with the COW
feature?) No one in the VNUML forum seems to know anything about it and the
forum administrator advised to expose my problem here.
I have seen the archives to see if there is a similar problem, but I haven't
found someone with the same problem as me I am specially interested in using
64 bit host OS as it is the only way we can fully use the system resources
our servers have. Is there anything I am doing wrong?
.
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