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

[Dave Jones]

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?

processor	: 0
vendor_id	: AuthenticAMD
cpu family      : 6
model   	: 2
model name      : AMD Athlon(tm) Processor
stepping        : 1
cpu MHz         : 800.034
cache size      : 512 KB

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 12570 cycles per page
copy_page function '2.4 non MMX'	 took 18763 cycles per page
copy_page function '2.4 MMX fallback'    took 18764 cycles per page
copy_page function '2.4 MMX version' 	 took 12564 cycles per page
copy_page function 'faster_copy'     	 took 8001 cycles per page 
copy_page function 'even_faster'     	 took 7362 cycles per page 
copy_page function 'no_prefetch'     	 took 7536 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 12583 cycles per page
copy_page function '2.4 non MMX'	 took 18768 cycles per page
copy_page function '2.4 MMX fallback'    took 21556 cycles per page
copy_page function '2.4 MMX version'     took 12636 cycles per page
copy_page function 'faster_copy'         took 7375 cycles per page 
copy_page function 'even_faster'         took 7368 cycles per page 
copy_page function 'no_prefetch'         took 7552 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 12562 cycles per page
copy_page function '2.4 non MMX'	 took 18755 cycles per page
copy_page function '2.4 MMX fallback'    took 21687 cycles per page
copy_page function '2.4 MMX version'     took 12604 cycles per page
copy_page function 'faster_copy'         took 7358 cycles per page 
copy_page function 'even_faster'         took 7356 cycles per page 
copy_page function 'no_prefetch'         took 7566 cycles per page 

00:00.0 Host bridge: VIA Technologies, Inc. VT82C693A/694x [Apollo PRO133x] (rev 02)
00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo MVP3/Pro133x AGP]
00:04.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 22)
00:04.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 10)
00:04.2 USB Controller: VIA Technologies, Inc. USB (rev 10)
00:04.3 USB Controller: VIA Technologies, Inc. USB (rev 10)
00:04.4 Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 30)

Memory type is unbranded PC133 SDRAM

		Dave

-- 
| Dave Jones.        http://www.codemonkey.org.uk