Re: Possible performance regression?

[Gerhard Schneider <gs@ilsb.tuwien.ac.at>]

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Alan D. Brunelle wrote:
>
> 
> (0,1)         1      2      4      8     16     32     64    128    256
> RHEL4U2    23.8   46.8   87.8   89.6   89.5   89.6   89.5   89.5   89.5
> 2.6.14      3.9    7.8   15.6   31.2   62.5   89.6   89.5   89.5   89.6
> Differ    -83.6% -83.3% -82.2% -65.2% -30.2%   0.0%   0.0%   0.0%   0.0%
> 
> (0,1) means target 1 on bus 0, and then the columns represent different
> transfer sizes (1K up to 256K).  I also see some that show little if any
> difference:
> 
> (6,4)         1      2      4      8     16     32     64    128    256
> RHEL4U2    23.9   46.9   88.5   90.0   89.9   89.9   89.9   90.0   89.9
> 2.6.14.2   24.1   47.0   88.5   90.0   89.9   90.0   89.9   89.9   89.9
> Differ      0.8%   0.2%   0.0%   0.0%   0.0%   0.1%   0.0%  -0.1%   0.0%
> 

Did you apply [PATCH] mptfusion : dv performance fix by
Eric Dean Moore? (Dec. 1st, 2005) W/o that patch the first four disks of
an 1030 are performing 3.5 MB/s instead of 70 :-)
It was funny how slow a RAID 5-0 can be when four of fourteen disks
are slow...

                                          GS

-- 
Gerhard Schneider
Institute of Lightweight Design and          e-Mail:gs@ilsb.tuwien.ac.at
Structural Biomechanics (E317)                 Tel.:   +43 1 58801 31716
Vienna University of Technology / Austria      Fax:    +43 1 58801 31799
A-1040 Wien, Gusshausstrasse 27-29     http://www.ilsb.tuwien.ac.at/~gs/

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