amd64 slower than i386 on identical AMD 64 system? / How is hyperthreading handled on amd64?

[JoaoBR]

On Tuesday 14 March 2006 07:06, Alexander Konovalenko wrote:
> > Hi
> > Since some time (>6.0R) I have the impression that amd64 runs slower than
> > i386. Now I run some tests on identical hardware and using ubench
> > confirmes this. Somebody has comments on this?
>
> I have Dual core AMD64 4400+ and FreeBSD RELENG_5. I don't have FreeBSD
> i386 installed but you can just compare benchmarks.
>
> ubench uses all CPU/cores by default, when one ubench is running, top
> shows:
>

so where is your comparism? My point was that the same hardware is faster 
running i386

I experience this also on X2 machines but do not have two machines to compare
I have a X2-4400-SMP running amd64 and a X2-4200-SMP running i386 and it gives 
me the same numbers running ubench



João






>  PID USERNAME   PRI NICE   SIZE    RES STATE  C   TIME   WCPU    CPU
> COMMAND 11528 XXXX       111    0  3572K   880K RUN    1   0:12 93.64%
> 42.29% ubench 11529 XXXX       111    0  3572K   880K CPU0   1   0:11
> 97.21% 41.16% ubench 11526 XXXX        -8    0  3572K   880K piperd 0  
> 0:17 41.76% 31.98% ubench
>
>
> one ubench executed (with no -s flag = use all CPU, default):
>
> Unix Benchmark Utility v.0.3
> Copyright (C) July, 1999 PhysTech, Inc.
> Author: Sergei Viznyuk <sv at phystech.com>
> http://www.phystech.com/download/ubench.html
> FreeBSD 5.5-PRERELEASE FreeBSD 5.5-PRERELEASE #12: Sun Mar  5 17:34:07 CET
> 2006     XXXX at XXXX:/usr/obj/usr/src/sys/DAEMON64SMP amd64
> Ubench CPU:   238149
> Ubench MEM:   255459
> --------------------
> Ubench AVG:   246804
>
>
> two ubench executed with -s flag (use single CPU only):
>
> Ubench Single CPU:   120184 (0.40s)
> Ubench Single MEM:   126787 (0.39s)
> -----------------------------------
> Ubench Single AVG:   123485
>
> Ubench Single CPU:   121000 (0.41s)
> Ubench Single MEM:   128762 (0.40s)
> -----------------------------------
> Ubench Single AVG:   124881
>
>
> one ubench executed with -s flag (use single CPU only):
>
> Ubench Single CPU:   123251 (0.40s)
> Ubench Single MEM:   161494 (0.40s)
> -----------------------------------
> Ubench Single AVG:   142372
>
>
> /Alexander Konovalenko
>
> +46-8-5537-8142 (office)
> +46-7-3752-2116
> http://daemon.nanophys.kth.se/~kono
>
> Royal Institute of Technology (KTH)
> Nanostructure Physics Department, Albanova
> Roslagstullsbacken 21
> 10691 Stockholm
> Sweden
>
>
>







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