[uml-devel] Performance tests (was: Using UML in libguestfs)

["Richard W.M. Jones" <rjones@redhat.com>]

I performed some benchmarks against KVM:

http://rwmj.wordpress.com/2013/08/14/performance-of-user-mode-linux-as-a-libguestfs-backend/#content

Notes for those that don't want to read all that, there are at least
two bugs I found:

(1) fsync /dev/ubda (in the guest) is not honoured by the user-mode
linux process.  It should do an fsync on the corresponding backing file.

(2) The ssl<N>=... serial port is really slow, at least 10 times
slower than virtio-serial which is the equivalent KVM feature.
libguestfs is chatty over the serial port, and so this has a
significant knock-on impact all over the place.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW

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