Re: [CFT] faster athlon/duron memory copy implementation

[simon@himi.org (Simon Fowler)]

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On Thu, Oct 24, 2002 at 07:15:43PM +0200, Manfred Spraul wrote:
> AMD recommends to perform memory copies with backward read operations 
> instead of prefetch.
> 
> http://208.15.46.63/events/gdc2002.htm
> 
> Attached is a test app that compares several memory copy implementations.
> Could you run it and report the results to me, together with cpu, 
> chipset and memory type?
> 
> Please run 2 or 3 times.
> 
simon@caccini:~/hacking$ cat /proc/cpuinfo 
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 1
model name      : AMD-K7(tm) Processor
stepping        : 2
cpu MHz         : 553.880
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat mmx syscall mmxext 3dnowext 3dnow
bogomips        : 1104.28

simon@caccini:~/hacking$ ./athlon; ./athlon; ./athlon 
Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $ 

copy_page() tests 
copy_page function 'warm up run'         took 12855 cycles per page
copy_page function '2.4 non MMX'         took 17267 cycles per page
copy_page function '2.4 MMX fallback'    took 14930 cycles per page
copy_page function '2.4 MMX version'     took 10642 cycles per page
copy_page function 'faster_copy'         took 10591 cycles per page
copy_page function 'even_faster'         took 13035 cycles per page
copy_page function 'no_prefetch'         took 11657 cycles per page
Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $ 

copy_page() tests 
copy_page function 'warm up run'         took 12871 cycles per page
copy_page function '2.4 non MMX'         took 18482 cycles per page
copy_page function '2.4 MMX fallback'    took 15013 cycles per page
copy_page function '2.4 MMX version'     took 10679 cycles per page
copy_page function 'faster_copy'         took 12268 cycles per page
copy_page function 'even_faster'         took 10789 cycles per page
copy_page function 'no_prefetch'         took 11691 cycles per page
Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $ 

copy_page() tests 
copy_page function 'warm up run'         took 13110 cycles per page
copy_page function '2.4 non MMX'         took 14958 cycles per page
copy_page function '2.4 MMX fallback'    took 14952 cycles per page
copy_page function '2.4 MMX version'     took 12864 cycles per page
copy_page function 'faster_copy'         took 10581 cycles per page
copy_page function 'even_faster'         took 10629 cycles per page
copy_page function 'no_prefetch'         took 11607 cycles per page

Simon

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