[libvirt] Slow libvirtd startup

[Zeeshan Ali (Khattak)]

On Thu, Jan 10, 2013 at 4:17 PM, Michal Privoznik <mprivozn at redhat.com> wrote:
> On 10.01.2013 14:53, Zeeshan Ali (Khattak) wrote:
>> On Thu, Jan 10, 2013 at 12:06 PM, Michal Privoznik <mprivozn at redhat.com> wrote:
>>> On 09.01.2013 22:38, Zeeshan Ali (Khattak) wrote:
>>>> Hi,
>>>>   Too lazy to explain again so I'll just c&p conversation I had about
>>>> the issue with Eric on IRC:
>>>>
>>>> <zeenix> is timeouts on session libvirt (or in general) something new?
>>>> <zeenix> libvirtd startup seems to now take a few seconds so Boxes UI
>>>> is all empty for that amount of time
>>>> <eblake> it's been around for a while; qemu.conf has settings to
>>>> control how long it should take
>>>> <zeenix> unless Boxes is launched before libvirtd timesout
>>>> <eblake> but there is a relatively new patch that makes the libvirtd
>>>> -t actually be useful for qemu:///session
>>>> <zeenix> don't think i ever changed that, at least not recently
>>>> <zeenix> that could be it
>>>> <zeenix> i only saw it happening after i update libvirtd (after a month)
>>>> <eblake> if you're seeing some delays in starting libvirtd, those are
>>>> probably worth fixing
>>>> <zeenix> s/update/recently updated/
>>>> <zeenix> yeah
>>>> <zeenix> i'll try to write a test app
>>>> <zeenix> no need, i can reproduce with virsh :)
>>>>
>>>> [zeenix at z-laptop virt]$ time virsh list
>>>>  Id    Name                           State
>>>> ----------------------------------------------------
>>>>
>>>>
>>>> real  0m6.349s
>>>> user  0m0.016s
>>>> sys   0m0.010s
>>>> [zeenix at z-laptop virt]$ time virsh list
>>>>  Id    Name                           State
>>>> ----------------------------------------------------
>>>>
>>>>
>>>> real  0m0.024s
>>>> user  0m0.010s
>>>> sys   0m0.011s
>>>>
>>>>
>>>
>>> You can try turning debug logs on and hopefully it will let more light
>>> in. To turn them on:
>>>
>>> $ cat ~/.config/libvirt/libvirtd.conf
>>> log_level=1
>>> log_outputs="1:file:/tmp/libvirtd.log"
>>>
>>> Moreover, if you could upload them somewhere then so we all can take a look.
>>
>> Here you go :)
>>
>> http://static.fi/~zeenix/tmp/libvirtd-session-zeenix.log
>>
>
> Yeah, Daniel was right; It's because we are querying capabilities:
>
> http://pastebin.com/FA6HWYrS
>
> You have too much qemus there :) Libvirt spent ~7 seconds there.

Yeah, capabilities query has always been slow on my machine at least.
I think I've even a bug against libvirt for that. I'll see qemu
packages allow me to remove the qemus i don't need as workaround in
the meantime.. Should i file a bug about this btw or whining on list
is enough? :)


-- 
Regards,

Zeeshan Ali (Khattak)
FSF member#5124