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Subject: Re: Athlon problem report summary
To: lkml@sigkill.net (Disconnect)
Date: Sat, 21 Apr 2001 01:34:46 +0100 (BST)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), linux-kernel@vger.kernel.org
In-Reply-To: <20010420203029.C20176@sigkill.net> from "Disconnect" at Apr 20, 2001 08:30:29 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Is there anything out there to test/benchmark MMX ops? (Preferably with
> reporting on MMX and equiv non-MMX ops, tunable memory bandwidth, etc.)

I wrote a set of programs to tune the MMX code. Arjan I suspect did similar
when he reoptimised the code for the newer Athlon. Simple stuff like



#include <stdio.h>

char space[1024*1024];
char target[1024*1024];

void mmx_copy(char *from, char *to)
{
	int i;
	char fpu_save[108];
	__asm__ __volatile__ ( " fsave %0; fwait\n"::"m"(fpu_save[0]) );
	__asm__ __volatile__ (
		"  prefetch (%0)\n"
		"  prefetch 64(%0)\n"
		"  prefetch 128(%0)\n"
		"  prefetch 192(%0)\n"
		"  prefetch 256(%0)\n"
		: : "r" (from) );

	for(i=0;i<4096/64;i++)
	{
		__asm__ __volatile__ (
		"  prefetch 320(%0)\n"
		"  movq (%0), %%mm0\n"
		"  movq 8(%0), %%mm1\n"
		"  movq 16(%0), %%mm2\n"
		"  movq 24(%0), %%mm3\n"
		"  movq %%mm0, (%1)\n"
		"  movq %%mm1, 8(%1)\n"
		"  movq %%mm2, 16(%1)\n"
		"  movq %%mm3, 24(%1)\n"
		"  movq 32(%0), %%mm0\n"
		"  movq 40(%0), %%mm1\n"
		"  movq 48(%0), %%mm2\n"
		"  movq 56(%0), %%mm3\n"
		"  movq %%mm0, 32(%1)\n"
		"  movq %%mm1, 40(%1)\n"
		"  movq %%mm2, 48(%1)\n"
		"  movq %%mm3, 56(%1)\n"
		: : "r" (from), "r" (to) : "memory");
		from+=64;
		to+=64;
	}
	__asm__ __volatile__ ( " frstor %0;\n"::"m"(fpu_save[0]) );
}

int main(int argc, char *argv)
{
	char *from=space;
	char *to=target;
	int r;
	int i;
	for(r=0;r<2048;r++)
	{
		for(i=0;i<256;i++)
		{
			mmx_copy(from, to);
			from+=4096;
			to+=4096;
			
		}
		from=space;
		to=target;
	}
}
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