Re: [parisc-linux] B132L outperforms C160 - 64-bit userland needed?

["Michael S. Zick" <mszick@morethan.org>]

On Tue August 16 2005 04:23, Kurt Fitzner wrote:
> In the interim until I can source an ISA/EISA fast ethernet card, I've
> been playing with my new C160.  I decided to benchmark it and compare it
> to my B132L.  To my surprise, when it came to integer operations, the
> B132L outperforms the C160!
> 
> I benchmarked using nbench, which is a Linux/Unix port of Byte
> magazine's ByteMark.  Full results from both machines are at the end of
> this post.
> 
> Both machines were benchmarked using identical binaries compiled with:
> -O3 -march=1.1 -mschedule=7300 -mfast-indirect-calls -mgas
> 
> Thinking that the scheduling and architecture might be slowing down the
> C160, I recompiled it with:
> -O3 -march=2.0 -mschedule=8000 -mfast-indirect-calls -mgas
> 
> When that produced even worse results, I tried -march=2.0 vs 1.1 and
> -mschedule=8000 vs 7300 seperately.  Each one alone slows down the
> benchmark and the effect is addititive.  It seems that in Linux, right
> now at least, compiling with -march=2.0 or -mschedule=8000 is a Bad Thing.
>
It would be interesting to see if this also holds with a newer GCC.
(3.4, 4.0, 4.1)

> 
> If you look at the individual results, in most areas the C160 performs
> about 20% better than the B132.  It's just that in a few areas, the C160
> has absolutely dismal performance.  Numeric sorting and the assignment
> algorithm were both notably slower on the C160.
> 
> With a clock speed 20% faster, I must admit that the C160's poor showing
> was a dissappointment.  I'm wondering if this is because there isn't a
> 64-bit userland yet.  Is stepping down to 32-bit on the C160 hurting its
> performance that badly?
> 
Try the same version kernel on both machines - you might just be seeing
the difference between 2.6.8 and 2.6.10. (or 32bit and 64bit kernels).

Also, what compiler was used to build the kernel.

Mike
> I suppose (assuming I'm correct about the reason for the performance
> drop) my options are to wait for 64-bit userland or to put HPUX on it.
> 
> Is there any way which someone can help the 64-bit userland effort who
> is quite strong in system-level programming in general though weak in
> Linux kernel programming specifically?  Is there a project web site for
> this effort?
> 
> 	Kurt
> 
> 
> Phong (C160):
> ------------------------------------------------------------------
> TEST                : Iterations/sec.  : Old Index   : New Index
>                     :                  : Pentium 90* : AMD K6/233*
> --------------------:------------------:-------------:------------
> NUMERIC SORT        :           37.51  :       0.96  :       0.32
> STRING SORT         :          5.0486  :       2.26  :       0.35
> BITFIELD            :      1.6052e+07  :       2.75  :       0.58
> FP EMULATION        :          8.4215  :       4.04  :       0.93
> FOURIER             :          1102.1  :       1.25  :       0.70
> ASSIGNMENT          :         0.59547  :       2.27  :       0.59
> IDEA                :          115.34  :       1.76  :       0.52
> HUFFMAN             :          89.382  :       2.48  :       0.79
> NEURAL NET          :          1.6905  :       2.72  :       1.14
> LU DECOMPOSITION    :          41.254  :       2.14  :       1.54
> =======================ORIGINAL BYTEMARK RESULTS=======================
> INTEGER INDEX       : 2.187
> FLOATING-POINT INDEX: 1.938
> Baseline: MSDOS P90, 256 KB L2-cache, Watcom* compiler 10.0
> ===========================LINUX DATA BELOW============================
> CPU                 : Raven U 160 (9000/780/C160) 160MHz
> L2 Cache            : 512 KB (WB, 0-way associative)
> OS                  : Linux 2.6.10-pa11-phong-3
> C compiler          : gcc version 3.3.5 (Debian 1:3.3.5-13)
> libc                : ld-2.3.2.so
> MEMORY INDEX        : 0.491
> INTEGER INDEX       : 0.591
> FLOATING-POINT INDEX: 1.075
> Baseline: Linux AMD K6/233*, 512 KB L2-cache, gcc 2.7.2.3, libc-5.4.38
> =======================================================================
> 
> 
> Megabyte (B132L):
> ------------------------------------------------------------------
> TEST                : Iterations/sec.  : Old Index   : New Index
>                     :                  : Pentium 90* : AMD K6/233*
> --------------------:------------------:-------------:------------
> NUMERIC SORT        :          60.695  :       1.56  :       0.51
> STRING SORT         :          3.3905  :       1.51  :       0.23
> BITFIELD            :      1.1081e+07  :       1.90  :       0.40
> FP EMULATION        :          6.0832  :       2.92  :       0.67
> FOURIER             :          876.58  :       1.00  :       0.56
> ASSIGNMENT          :         0.80283  :       3.05  :       0.79
> IDEA                :          150.04  :       2.29  :       0.68
> HUFFMAN             :          76.017  :       2.11  :       0.67
> NEURAL NET          :          1.1334  :       1.82  :       0.77
> LU DECOMPOSITION    :          41.733  :       2.16  :       1.56
> =======================ORIGINAL BYTEMARK RESULTS=======================
> INTEGER INDEX       : 2.121
> FLOATING-POINT INDEX: 1.577
> Baseline: MSDOS P90, 256 KB L2-cache, Watcom* compiler 10.0
> ===========================LINUX DATA BELOW============================
> CPU                 : Merlin L2 132 (9000/778/B132L) 132MHz
> Cache               : 64 KB (WB, 0-way associative)
> OS                  : Linux 2.6.8.1-pa11-megabyte-20050720
> C compiler          : gcc version 3.3.5 (Debian 1:3.3.5-13)
> libc                : ld-2.3.2.so
> MEMORY INDEX        : 0.419
> INTEGER INDEX       : 0.630
> FLOATING-POINT INDEX: 0.875
> Baseline: Linux AMD K6/233*, 512 KB L2-cache, gcc 2.7.2.3, libc-5.4.38
> =======================================================================
> 
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