Re: Patch to reorder functions in the vmlinux to a defined order

[linux-os (Dick Johnson)]

On Thu, 23 Feb 2006, Linus Torvalds wrote:

>
>
> On Thu, 23 Feb 2006, Arjan van de Ven wrote:
>>>
>>> I think you would first need to move the code first for that. Currently it starts
>>> at 1MB, which means 1MB is already wasted of the aligned 2MB TLB entry.
>>>
>>> I wouldn't have a problem with moving the 64bit kernel to 2MB though.
>>
>> that was easy since it's a Config entry already ;)
>
> Btw, the "low TLB entry" for the direct-mapped case can't be used as a
> hugetlb page anyway, due to the MMU splitting it up due to the special
> MTRR regions, if I recall correctly.
>
> So this is probably a bigger performance win than just the difference
> between using one or two TLB entries.
>
> The same should be true on x86, btw. Where we should use a physical start
> address of 4MB for best performance.
>
> Does anybody want to run benchmarks? (Totally untested, may not boot,
> might physically accost your pets for all I know).
>
> 		Linus

I just reconfigured and rebuilt linux-2.6.15.4 to put PHYSICAL_START
at 0x00400000, unconditionally and it booted fine and is working so
a 'boot' shouldn't be a problem.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.15.4 on an i686 machine (5589.54 BogoMips).
Warning : 98.36% of all statistics are fiction.
_


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