linux-kernel - Re: is kernel slower at loading for some hardware ?

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Message-ID: <20150508182421.GA1759@bugger.home>
Date:	Fri, 8 May 2015 20:24:21 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	linux cbon <linuxcbon@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: is kernel slower at loading for some hardware ?

On Tue, May 05, 2015 at 12:20:31AM +0100, linux cbon wrote:
> On Mon, May 4, 2015 at 8:50 AM, Frans Klaver <fransklaver@...il.com> wrote:
> > On Mon, May 4, 2015 at 7:21 AM, linux cbon <linuxcbon@...il.com> wrote:
> >> Hi,
> >> during boot up, I am trying to find where the kernel takes more time
> >> to do actions (is slower ?).
> >> I looked at dmesg and found some places where it takes more time, but
> >> not sure if this is normal :
> (.......)
> > All hardware is different and therefore initialization time can be
> > different per component. Besides that, you're looking at something
> > that depends on how verbose the driver's logs are. It may well be that
> > the kernel is doing a lot of work, but just doesn't output anything
> > that clears the minimum log level.
> > Frans
> 
> 
> Hi Frans,
> I would like to have the maximal verbose logs,
> can you please tell me what is the way to achieve this ?
> And do you know the best way to find out where the kernel
> is getting slow and is having problems ?
> Thanks for your help.

Maybe this page can help you further:

http://elinux.org/Debugging_by_printing

Good luck,
Frans
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