linux-kernel - Re: boot

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Message-ID: <a8e1da0802252148p43d7b899t25ed0a9f994fae35@mail.gmail.com>
Date:	Tue, 26 Feb 2008 13:48:45 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Randy Dunlap" <randy.dunlap@...cle.com>
Cc:	akpm <akpm@...ux-foundation.org>,
	"Dave Jones" <davej@...emonkey.org.uk>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: Re: boot_delay broken ?

On Tue, Feb 26, 2008 at 1:22 PM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> On Mon, 25 Feb 2008 10:14:36 +0800 Dave Young wrote:
>
>  > On Sun, Feb 24, 2008 at 8:46 AM, Dave Jones <davej@...emonkey.org.uk> wrote:
>  > > The boot_delay switch seems to be behaving strangely in the
>  > >  current -git.  Setting it to =10 makes the output 'bursty'
>  > >  it becomes slow for some printk's whilst others scroll by
>  > >  at regular speed.
>  > >  Setting it any higher than that seems to make it pause for
>  > >  a really long time before it outputs any text at all.
>  >
>  > On my side there's this issue for a long time
>  > http://lkml.org/lkml/2007/8/8/79
>
>  [http://marc.info/?l=linux-kernel&m=118655896515049&w=2]
>
>  You asked questions and they were answered.  Perhaps you didn't like
>  the answers.

No, I like it.  Thanks.

But I still want to know why mdelay can not be used.
is it not available for all archs or something else?

>
>  Here's a question for you.  What kernel boot options did you use?
>  Specifically, for lpj= and boot_delay= ?

I tried boot_delay=100 and boot_delay=200 without lpj set, The result
was really slow. It was better with lpj copied from dmesg, but was
still slower then mdelay.

I think we can firstly use preset lpj, after delay calibrating just
use the system lpj

>
>  > >
>  > >  x86 timer changes perhaps ?
>
>
>  ---
>  ~Randy
>
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