Re: New csum and csum_copy routines - and a test/benchmark program

From: J.A. Magallon (jamagallon@able.es)
Date: Mon Oct 28 2002 - 10:12:20 EST

On 2002.10.28 Denis Vlasenko wrote:
>
>Duron 650
>=========
>csum tests:
> kernel_csum - took 2612 max, 1887 min cycles per kb. sum=0xfad28968
> kernel_csum - took 2654 max, 1887 min cycles per kb. sum=0xfad28968
> kernel_csum - took 2105 max, 1887 min cycles per kb. sum=0xfad28968
> kernel2_csum - took 2636 max, 1925 min cycles per kb. sum=0xfad28968
> kernelpii_csum - took 11879 max, 1735 min cycles per kb. sum=0xaeffd53b
> kernelpiipf_csum - took 2565 max, 1642 min cycles per kb. sum=0xaeffd53b
>copy tests:
> kernel_copy - took 5812 max, 4854 min cycles per kb. sum=0xfad28968
> kernel_copy - took 5741 max, 4854 min cycles per kb. sum=0xfad28968
> kernel_copy - took 17680 max, 4859 min cycles per kb. sum=0xfad28968
> kernelpii_copy - took 7204 max, 6381 min cycles per kb. sum=0xe3bca07e
> kernelpiipf_copy - took 8429 max, 7477 min cycles per kb. sum=0xe3bca07e
>
>Celeron 1200
>============
>csum tests:
> kernel_csum - took 7368 max, 6833 min cycles per kb. sum=0x291132e0
> kernel_csum - took 9038 max, 6845 min cycles per kb. sum=0x291132e0
> kernel_csum - took 7112 max, 6836 min cycles per kb. sum=0x291132e0
> kernel2_csum - took 7254 max, 6871 min cycles per kb. sum=0x291132e0
> kernelpii_csum - took 4696 max, 4109 min cycles per kb. sum=0x484713aa
> kernelpiipf_csum - took 4715 max, 4271 min cycles per kb. sum=0x484713aa
>copy tests:
> kernel_copy - took 13927 max,13450 min cycles per kb. sum=0x291132e0
> kernel_copy - took 14009 max,13406 min cycles per kb. sum=0x291132e0
> kernel_copy - took 13957 max,13447 min cycles per kb. sum=0x291132e0
> kernelpii_copy - took 15039 max,11335 min cycles per kb. sum=0x5474077d
> kernelpiipf_copy - took 14137 max,13059 min cycles per kb. sum=0x5474077d

Ejem, I have read your comment about not posting results, but can really a PII
do this:

Pentium2 400, 512Kb cache
=========================
Csum benchmark program
buffer size: 4 Mb
Each test tried 32 times, max and min CPU cycles are reported.
Please disregard max values. They are due to system interference only.
csum tests:
                     kernel_csum - took 2586 max, 2541 min cycles per kb. sum=0x7a86335d
                     kernel_csum - took 2566 max, 2541 min cycles per kb. sum=0x7a86335d
                     kernel_csum - took 2703 max, 2541 min cycles per kb. sum=0x7a86335d
                    kernel2_csum - took 2890 max, 2556 min cycles per kb. sum=0x7a86335d
                  kernelpii_csum - took 1682 max, 1494 min cycles per kb. sum=0x993114b2
                kernelpiipf_csum - took 1688 max, 1493 min cycles per kb. sum=0x993114b2
                        kpf_csum - took 1742 max, 1703 min cycles per kb. sum=0xf3500fff
                        kpf_csum - took 1805 max, 1747 min cycles per kb. sum=0xf3500fff
                        kpf_csum - took 1746 max, 1703 min cycles per kb. sum=0xf3500fff
                        kpf_csum - took 1777 max, 1747 min cycles per kb. sum=0xf3500fff
copy tests:
                     kernel_copy - took 4507 max, 4306 min cycles per kb. sum=0x7a86335d
                     kernel_copy - took 4704 max, 4306 min cycles per kb. sum=0x7a86335d
                     kernel_copy - took 4833 max, 4306 min cycles per kb. sum=0x7a86335d
                  kernelpii_copy - took 3688 max, 3504 min cycles per kb. sum=0xa3cf0a14
                kernelpiipf_copy - took 4961 max, 4516 min cycles per kb. sum=0xa3cf0a14
Done

I had to set empty prefetch in kpf_csum.
I can't run kpf_copy benchmarks, they crash even with empty prefetch.
Do they contain PIII specific code ?

TIA 

-- 
J.A. Magallon <jamagallon@able.es>      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.1 (Cooker) for i586
Linux 2.4.20-pre11-jam2 (gcc 3.2 (Mandrake Linux 9.0 3.2-2mdk))
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This archive was generated by hypermail 2b29 : Thu Oct 31 2002 - 22:00:36 EST