[libvirt-users] Quadratic function-like call delay

[Daniel Veillard]

On Mon, Sep 24, 2012 at 11:48:44AM +0400, Andrey Korolyov wrote:
> Hi,
> 
> There is a quite annoying thing, don`t sure if I can call it a bug.
> 
> How to reproduce:
> 
> - start a bunch of VMs,
> - stop libvirt,
> - start libvirt and immediately issue any call, say, 'virsh version',
> - delay until call completion may be fitted nearly as quadratic
> function from number of running VMs, qemu-kvm in my case (see link
> below). After this delay passed, any calls executed without slowdown,
> so problem is only a 'dead gap' after restarting service.
> 
> http://xdel.ru/downloads/libvirt.png

  When the daemon is restarted it needs to reconnect to all the guests
and that operation takes time. I'm not sure why it's not linear, but I
think i experienced that a couple of years ago, so that doesn't sounds
a recent regression. If you can look at what is going on, that would be
useful

Daniel

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