linux-kernel - Re: [PATCH 20/20] x86_64: Move CPU verification code to common file

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Date:	Sat, 18 Nov 2006 07:22:59 +0000
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <ak@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	vgoyal@...ibm.com, akpm@...l.org, rjw@...k.pl,
	ebiederm@...ssion.com, Reloc Kernel List <fastboot@...ts.osdl.org>,
	pavel@...e.cz, magnus.damm@...il.com
Subject: Re: [PATCH 20/20] x86_64: Move CPU verification code to common file

On Fri, Nov 17, 2006 at 10:59:32PM -0800, H. Peter Anvin wrote:
> Oleg Verych wrote:
> >
> >It will burn CPU, until power cycle will be done (my AMD64 laptop and
> >Intel's amd64 destop PC require that). In case of reboot timeout (or
> >just reboot with jump to BIOS), i will just choose another image to boot
> >or will press F8 to have another boot device.
> >
> 
> That's a fairly stupid argument, since it assumes operator intervention, 
> at which point you have access to the machine anyway.

I would never call *power cycle* stupid, just because from physics
point of veiw.

Example. I have my flower.upol.cz many kilometers far away from me.
I used to boot it from that flash (new hardware, sata problems, etc).

When something goes wrong with rc kernel or power source, bum.
And i had to move my ass there, just to press reset. Because.

While i have "power on, on AC failures" in BIOS, *sometimes* flash
will not boot (i don't know why, maybe it's GRUB+flash-read,
or BIOS usb hdd implementation specific).

DTR laptop ~33% doesn't boot that flash. And laptop has no reset button.
Operator is present, so your consern is right here.

> A stronger argument is, again, that some bootloaders can do unattended 
> fallback.
____

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