[libvirt] Qemu/KVM is 3x slower under libvirt

Chris Wright chrisw at sous-sol.org
Thu Sep 29 16:40:21 UTC 2011

* Reeted (reeted at shiftmail.org) wrote:
> On 09/29/11 02:39, Chris Wright wrote:
> >Can you help narrow down what is happening during the additional 12
> >seconds in the guest?  For example, does a quick simple boot to single
> >user mode happen at the same boot speed w/ and w/out vhost_net?
> Not tried (would probably be too short to measure effectively) but
> I'd guess it would be the same as for multiuser, see also the FC6
> sub-thread
> >I'm guessing (hoping) that it's the network bring-up that is slow.
> >Are you using dhcp to get an IP address?  Does static IP have the same
> >slow down?
> It's all static IP.
> And please see my previous post, 1 hour before yours, regarding
> Fedora Core 6: the bring-up of eth0 in Fedora Core 6 is not
> particularly faster or slower than the rest. This is an overall
> system slowdown (I'd say either CPU or disk I/O) not related to the
> network (apart from being triggered by vhost_net).

OK, I re-read it (pretty sure FC6 had the old dhclient, which is why
I wondered).  That is odd.  No ideas are springing to mind.


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