Re: Athlon and fast_page_copy: What's it worth ? :)

Mark Hahn
2001-05-05T06:21:25Z

On Fri, 4 May 2001, Seth Goldberg wrote:

> Hi,
>
> Before I go any further with this investigation, I'd like to get an
> idea
> of how much of a performance improvement the K7 fast_page_copy will give
> me.
> Can someone suggest the best benchmark to test the speed of this
> routine?

Arjan van de Ven did the code, and he wrote a little test harness.
I've hacked it a bit (http://brain.mcmaster.ca/~hahn/athlon.c);
on my duron/600, kt133, pc133 cas2, it looks like this:

clear_page by 'normal_clear_page' took 7221 cycles (324.6 MB/s)
clear_page by 'slow_zero_page' took 7232 cycles (324.1 MB/s)
clear_page by 'fast_clear_page' took 6110 cycles (383.6 MB/s)
clear_page by 'faster_clear_page' took 2574 cycles (910.6 MB/s)

copy_page by 'normal_copy_page' took 7224 cycles (324.4 MB/s)
copy_page by 'slow_copy_page' took 7223 cycles (324.5 MB/s)
copy_page by 'fast_copy_page' took 4662 cycles (502.7 MB/s)
copy_page by 'faster_copy' took 2746 cycles (853.5 MB/s)
copy_page by 'even_faster' took 2802 cycles (836.5 MB/s)

70% faster!