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

[Fabian Deutsch]

Am Freitag, den 16.08.2013, 07:58 +0000 schrieb 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.

You can add rd.debug and/or rd.udev.debug to the cmdline when booting.
In that case dracut will log to either journald (if systemd is used
within dracut) or to /run/initramfs/init.log.

I'm curious what dracut is taking so long ..

- fabian

> 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
> > >
> > > _______________________________________________
> > > node-devel mailing list
> > > node-devel at ovirt.org
> > > http://lists.ovirt.org/mailman/listinfo/node-devel
> > 
> 
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