[Libvir] PATCH 0/20: Re-factor libvirtd / QEMU driver
Daniel P. Berrange
berrange at redhat.com
Fri Jun 22 02:55:48 UTC 2007
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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