fc5 kernels after 1788 have excessive, kernel overhead
Dave Jones
davej at redhat.com
Tue Jan 3 01:36:46 UTC 2006
On Mon, Jan 02, 2006 at 11:29:26PM +0000, Andy Burns wrote:
> Dave Jones wrote:
>
> >Does acpi=off on the smp kernel make any difference?
>
> acpi=off with the SMP kernel doesn't break it
> acpi=off with the UP kernel doesn't mend it
>
> >Any chance you can hook up another pc, and get a serial capture
> >of the failing boot ?
>
> Below is the UP log, followed by SMP log for good measure
>
> Incidentally, is it correct that the UP kernel only approximates NX, yet
> the SMP kernel makes proper use of NX?
If the CPU has hardware NX support , then the SMP kernel does take
advantage of it, whilst the UP one has to fall back on segment-limit
approach to 'emulate' it. The reason for this is that the SMP
kernel has support for physical address extensions (PAE) (Ie, >4GB RAM)
and NX is dependant on that. The UP kernel doesn't have PAE
because a kernel compiled with that supported doesn't boot on
systems that lack it, (Celerons, early VIA, some mobile Pentium)
> Would disabling HT in BIOS affect it?
You tell me :) I can't think of any reason why this has suddenly
broken that would be related to that though.
Dave
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