Re: [uml-devel] Using UML in libguestfs

2013-08-11 Thread Richard W.M. Jones
On Sun, Aug 11, 2013 at 09:05:08PM +0200, Geert Uytterhoeven wrote: > On Fri, Aug 9, 2013 at 10:43 PM, Richard W.M. Jones wrote: > > * UML is pretty fast! It's certainly faster (by a factor of > 5) than > > spinning up a lightweight KVM VM. > This is interesting. Typically people say you have to

Re: [uml-devel] Using UML in libguestfs

2013-08-11 Thread Geert Uytterhoeven
On Fri, Aug 9, 2013 at 10:43 PM, Richard W.M. Jones wrote: > * UML is pretty fast! It's certainly faster (by a factor of > 5) than > spinning up a lightweight KVM VM. This is interesting. Typically people say you have to use KVM or XEN for good virtualization performance. But for that you need s

[uml-devel] How to reliably kill all vmlinux processes for a single VM?

2013-08-11 Thread Richard W.M. Jones
I found by experimentation that killing (SIGTERM) the first vmlinux process only kills part of a UML virtual machine. There are still vmlinux processes (or threads?) running. Compare the process listings below before and after sending the SIGTERM signal to the head process (25356). Is there a wa

[uml-devel] Issues with a rather unusual configured NFS server

2013-08-11 Thread Toralf Förster
so that the server either crashes (if it is a user mode linux image) or at least its reboot functionality got broken - if the NFS server is hammered with scary NFS calls using a fuzzy tool running at a remote NFS client under a non-privileged user id. It can re reproduced, if - the NFS s