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

[Olaf Dietsche <olaf.dietsche#list.linux-kernel@t-online.de>]

Manfred Spraul <manfred@colorfullife.com> writes:

> 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?

Duron 1200, Elitegroup K7VTA3, 512 MB (DDR PC266 CL2.5)

$ cat /proc/cpuinfo
processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 6
model		: 7
model name	: AMD Duron(tm) processor
stepping	: 1
cpu MHz		: 1200.023
cache size	: 64 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 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips	: 2367.48

$ lspci
00:00.0 Host bridge: VIA Technologies, Inc. VT8367 [KT266]
00:01.0 PCI bridge: VIA Technologies, Inc. VT8367 [KT266 AGP]
00:11.0 ISA bridge: VIA Technologies, Inc. VT8233 PCI to ISA Bridge
00:11.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 06)

$ gcc -v
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs
gcc version 2.95.4 20011002 (Debian prerelease)

$ gcc athlon.c -o 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 15795 cycles per page
copy_page function '2.4 non MMX'         took 16958 cycles per page
copy_page function '2.4 MMX fallback'    took 16862 cycles per page
copy_page function '2.4 MMX version'     took 15792 cycles per page
copy_page function 'faster_copy'         took 9576 cycles per page
copy_page function 'even_faster'         took 9385 cycles per page
copy_page function 'no_prefetch'         took 7637 cycles per page
$ ./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 15802 cycles per page
copy_page function '2.4 non MMX'         took 16957 cycles per page
copy_page function '2.4 MMX fallback'    took 16897 cycles per page
copy_page function '2.4 MMX version'     took 15854 cycles per page
copy_page function 'faster_copy'         took 9564 cycles per page
copy_page function 'even_faster'         took 9407 cycles per page
copy_page function 'no_prefetch'         took 7649 cycles per page
$ ./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 15807 cycles per page
copy_page function '2.4 non MMX'         took 16995 cycles per page
copy_page function '2.4 MMX fallback'    took 17056 cycles per page
copy_page function '2.4 MMX version'     took 16431 cycles per page
copy_page function 'faster_copy'         took 9832 cycles per page
copy_page function 'even_faster'         took 9389 cycles per page
copy_page function 'no_prefetch'         took 7657 cycles per page