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Re: [Libvir] PATCH 0/20: Re-factor libvirtd / QEMU driver



On Fri, Jun 22, 2007 at 02:34:05AM +0100, Daniel P. Berrange wrote:
> The work to refactor the QEMU driver to use the regular libvirt driver API
> is now complete. The next 20 (!) patches provide fairly fine-grained steps
> refactoring the code. Aside from that which adds an event loop, and the
> very last one, they should all be pretty much straightforward refactoring
> with no functional change.
> 
> With this patch series fully applied there is now only a single daemon
> which can serve both remote & QEMU drivers in one go, with no deadlock
> issues.

BTW, as a rough comparison of the old QEMU impl vs the new one in terms
of performance, here are the timings for listing active guests 10000
times over


Original QEMU code:

 time virsh --connect qemu:///system < src/data > /dev/null 

  real    0m0.963s
  user    0m0.246s
  sys     0m0.540s

New generic remote code:

 time ./src/virsh --connect qemu:///system < src/data > /dev/null 

  real    0m1.142s
  user    0m0.470s
  sys     0m0.377s

Which is easily close enough to ignore the difference


New generic remote code using plain TCP localhost:

 time ./src/virsh --connect qemu+tcp://localhost/system < src/data > /dev/null 

  real    0m1.857s
  user    0m0.543s
  sys     0m0.779s

New generic remote code using TLS localhost:

 time ./src/virsh --connect qemu://localhost/system < src/data > /dev/null 

  real    0m5.031s
  user    0m1.814s
  sys     0m1.303s

New generic remote code using SSH localhost:

 time ./virsh --connect qemu+ssh://localhost/system  < data > /dev/null 

  real    0m5.987s
  user    0m0.621s
  sys     0m1.147s


So there's a non-trivial hit from doing TLS/SSH. Only 0.25s is accounted
for by the initial handshake / negotiation. Still, small price to pay for
having data security of course...

Dan.
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