Re: More questions [Was: [parisc-linux] 2.6.10-rc1-pa11 profile data]

[Joel Soete <soete.joel@tiscali.be>]

Hello all,

I need more advise:

Joel Soete wrote:
> [...]
> 
>>but looking at the other ones:
>>- __clear_user_page_asm can be optimized for 64-bit by writing 8 bytes
>>  at a time instead of 4
> 
> Is it the idea (principle only):
> --- arch/parisc/kernel/pacache.S.Orig	2004-12-01 17:09:53.000000000 +0100
> +++ arch/parisc/kernel/pacache.S-t1	2004-12-01 17:58:16.000000000 +0100
> @@ -505,6 +505,16 @@
>  	ldi 64,%r1
>  
>  1:
> +#ifdef __LP64__
> +	std	%r0,0(%r28)
> +	std	%r0,8(%r28)
> +	std	%r0,16(%r28)
> +	std	%r0,24(%r28)
> +	std	%r0,32(%r28)
> +	std	%r0,40(%r28)
> +	std	%r0,48(%r28)
> +	std	%r0,56(%r28)
> +#else
>  	stw %r0,0(%r28)
>  	stw %r0,4(%r28)
>  	stw %r0,8(%r28)
> @@ -521,6 +531,7 @@
>  	stw %r0,52(%r28)
>  	stw %r0,56(%r28)
>  	stw %r0,60(%r28)
> +#endif
>  	ADDIB>  -1,%r1,1b
>  	ldo 64(%r28),%r28
> 
I test it on my b2k with 64bit kernel and it works but it didn't seems to bring me any benefit?
As far as I can believe readprofile: the ratio between the first and last column is always the same (1/80 in this case).
What did I miss?
My hope was at least a befenit of 1/2 as I reduce insn number in the same rate.
Right now my idea is to write a small test case to see if using the same number on insn but with less loop will help or not?


Thanks again for more advise,
	Joel
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