[node-devel] about boot time of ovirt-node

[Bohai (ricky)]

Hi Fabian, 

As your hint , I use the systemd-analyze to get the machine boot time as below:

real machine:
Startup finished in 1.657s (kernel) + 34.576s (initrd) + 38.054s (userspace) = 1min 14.288s
virtual machine:
Startup finished in 1.382s (kernel) + 2.624s (initrd) + 37.547s (userspace) = 41.554s

The main difference is about initrd's load time.

And i found a similar problem's discuss post in the opensuse community.
Link:
http://lists.opensuse.org/opensuse-factory/2013-03/msg00177.html

Summary from the post:
"
With grub2, it loads in 2-3 seconds on an HP dv2815 laptop with a modest
AMD Turion CPU at 2 GHz.

The difference might be grub2, or it might be due to poor performance
for an i7 running in 8686-compatibility mode. I doubt that Intel spent
much time optimizing those operations.
"


> -----Original Message-----
> From: Fabian Deutsch [mailto:fabiand at redhat.com]
> Sent: Thursday, August 15, 2013 5:23 PM
> To: Bohai (ricky)
> Cc: node-devel at ovirt.org; Luohao (A); Haofeng; boh.ricky at gmail.com
> Subject: Re: [node-devel] about boot time of ovirt-node
> 
> Am Donnerstag, den 15.08.2013, 07:13 +0000 schrieb Bohai (ricky):
> > Hi all,
> >
> > In the use of ovirt-node , I found a strange thing.
> > Ovirt-node system boots more faster in a virtual machine than a real
> machine.
> > (Because of no enough real machine, sometimes I use virtual machine
> > to test the setup and install function. And the real machine is absolutely more
> power
> >  than the real machine.)
> >
> > I don't to know why and how to find the reason about it.
> > Or whether it's a problem of ovirt-node?
> 
> I suppose you mean the OS part of the boot process? So not including
> POST and other bios related stuff.
> On the Fedora based node you could run a systemd-analyze to find out
> what service is taking how much time.
> 
> Greetings
> fabian
> 
> > Any help or hint is welcome.
> >
> > Best regards to you.
> > Ricky
> >
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>