[Libguestfs] More parallelism in VDDK driver (was: Re: CFME-5.11.7.3 Perf. Tests)

[Richard W.M. Jones]

Nir, BTW what are you using for performance testing?

As far as I can tell it's not possible to make qemu-img convert use
multi-conn when connecting to the source (which is going to be a
problem if we want to use this stuff in virt-v2v).

Instead I've hacked up a copy of this program from libnbd:

https://github.com/libguestfs/libnbd/blob/master/examples/threaded-reads-and-writes.c

so that it only does reads and aligns requests to 512 bytes.

At least this is testing multi-conn, but there should be an easier way ...

Rich.

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