Re: Slow booting on x15

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* Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> [200924 13:31]:
> Hi Tony,
> 
> On Thu, Sep 24, 2020 at 09:08:26AM +0300, Tony Lindgren wrote:
> > * Tomi Valkeinen <tomi.valkeinen@xxxxxx> [200924 06:05]:
> > > On 24/09/2020 08:53, Tony Lindgren wrote:
> > > >>>>> On Fri, Sep 18, 2020 at 06:25:02PM +0300, Tomi Valkeinen wrote:
> > > >>>>>> v5.9-rc5
> > > >>>>>> [    0.706165] cpuidle: using governor menu
> > > >>>>>> [    6.761812] No ATAGs?
> > > >>>>>>
> > > >>>>>> [   19.522536] Run /sbin/init as init process
> > > > 
> > > > Hmm v5.9-rc1 here with NFSroot shows this for me:
> > > > 
> > > > [   11.704511] Run /sbin/init as init process
> > > > 
> > > > And v5.9-rc6 shows:
> > > > 
> > > > [   13.120913] Run /sbin/init as init process
> > > > 
> > > > With at least two seconds spent on waiting for Ethernet PHY to
> > > > negotiate the speed. This is with omap2plus_defconfig.
> > > 
> > > I'm also using nfsroot, so I didn't put too much weight on the "Run /sbin/init as init process"
> > > line, as it could also be caused the network or the nfs server. But the "No ATAGs" lines already
> > > show an increase from 0.8s to 6.7s from v5.7 to v5.9-rc5.
> 
> Yes, that's the main issue.
> 
> > That's strange, I'm seeing this with v5.9-rc6:
> > 
> > [    2.357585] No ATAGs?
> 
> What's your test platform ?

This is from beagle x15. I wonder how Tomi is seeing over six seconds
at that point though while I'm seeing two something.

> Still, 1.5s spent there is quite a lot.

Probably that's when module_init runs and we probe almost everything.
Might be worth profiling to see if we can optimize out some full dtb
tree searches for example.

Regards,

Tony



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