Re: boot_delay broken ?

From: Dave Young
Date: Tue Feb 26 2008 - 00:48:56 EST


On Tue, Feb 26, 2008 at 1:22 PM, Randy Dunlap <randy.dunlap@xxxxxxxxxx> 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@xxxxxxxxxxxxxxxxx> 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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