Newsgroup: it.comp.hardware.scsi
Titolo: problema di prestazioni con SCSI...sembra incredibile

Si, e' proprio incredibile, il mio sistema (PII 392mhz, Asus P2B bios 
1005, Adaptec 2940UW e disco rigido IBM Ultrastar 2XP 9,1gb 7200rpm)
ha un difetto stranissimo: il transfer/rate (misurato con EX-SCSi 5.0) 
non supera mai i 10mb/s, eppure sto usando un HD UW-SCSI! e sono sicuro 
che tutto sia abilitato correttamente nel bios (Ultra e Wide Mode), del 
resto anche il benchmark "single sector transfer" che di norma dovrebbe 
saturare il BUS scsi impegandolo in un trasferimento cache-
hd/controller...non va oltre i 5mb/s !!! 
il bios dell'adaptec e' il 1.34.3....che diavolo puo' essere?? AIUTOOOO
non ho mai visto nessun benchmark I/O superare i 10-12mb/s...anche 
impegnado PIU' periferiche scsi contemporaneamente...:!!
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impegnado PIU' periferiche scsi contemporaneamente...:!!
Ti allego il sysbench 0.94d del mio sistema:
Sysbench 0.9.4d result file created Mon Mar 22 14:02:52 1999
Machine name       - Tower aic7870 2.3
Manufacturer       - Asustek DIMM 2x32MB
Motherboard        - ASUS TX97-E bios 112e beta 1
Chipset            - Intel - 82439TX System Controller
Processor          - AMD K6 unknown model 8 xMHz AMD-K6 3D - 375 MHz
(75x5) External cache     - 32Kb internal instruction cache, 32Kb internal
data cache Graphics card      - Matrox "Mystique" drv 2.23 bios 1.80
setup349 Storage Controller - Adaptec - Adaptec 2940UW Rev. B. bios 1.34.3
Machine data
Coprocessor        = Yes
Processors         = 1
RAM                = 64.00 MB
Operating System data
OS/2 version       = 20.40
CSDLevel           = XR0M010_
FIXLevel           = XR0M010_
Revision number    = 9.034
Priority           = Dynamic
Maxwait            = 1
Timeslice          = (33,59)
Protectonly        = NO
Swap file size     = 20.00MB
  ...initially     = 20.00MB
Video data
Resolution         = 1024x768x16 bits/pixel
Number planes      = 0
Screen Access      = Direct
Bank Switched      = No
Bytes/scanline     = 2048
Aperture size      = 1572864
Manufact. code     = 14
Chipset code       = 1306
 Graphics
   BitBlt S->S copy      :       78.509    Million pixels/second
   BitBlt M->S copy      :       17.230    Million pixels/second
   Filled Rectangle      :      372.827    Million pixels/second
   Pattern Fill          :      372.827    Million pixels/second
   Vertical Lines        :        8.685    Million pixels/second
   Horizontal Lines      :       46.664    Million pixels/second
   Diagonal Lines        :       15.427    Million pixels/second
   Text Render           :       17.618    Million pixels/second
   -----------------------------------------------------------------------
   Total                 :      107.910    PM-Graphics-marks
 CPU integer
   Dhrystone             :      466.600    VAX 11/780 MIPS equivalent
   Hanoi                 :      301.000    moves/25 microseconds
   Heapsort              :      170.200    Million Instructions Per Second
   Sieve                 :      309.600    Million Instructions Per Second
   -----------------------------------------------------------------------
   Total                 :      344.241    CPU integer-marks
 CPU float
   Linpack               :       23.240    MFLOPS
   Flops                 :       54.010    MFLOPS
   Fast Fourier Transfrm :       27.610    VAX FFT's
   -----------------------------------------------------------------------
   Total                 :       40.028    CPU floating point-marks
 Direct Interface to video extensions - DIVE
   Video bus bandwidth   :       53.357    Megabytes/second
   DIVE fun              :      189.864    fps normalised to 640x480x256
   M->S, DD,   1.00:1    :      181.993    fps normalised to 640x480x256
   -----------------------------------------------------------------------
   Total                 :       68.582    DIVE-marks
 File I/O - Drive G:
   4Kb seq.   Uncached w :     6061.973    Kilobytes/second
   4Kb seq.   Uncached r :     6227.725    Kilobytes/second
   4Kb random Uncached w :      530.681    Kilobytes/second
   4Kb random Uncached r :      561.532    Kilobytes/second
   4Kb seq.   Cached   w :      654.811    Kilobytes/second
   4Kb seq.   Cached   r :     6290.575    Kilobytes/second
   4Kb random Cached   w :      250.068    Kilobytes/second
   4Kb random Cached   r :    61356.785    Kilobytes/second
   8Kb seq.   Uncached w :     2590.894    Kilobytes/second
   8Kb seq.   Uncached r :    54840.392    Kilobytes/second
   8Kb random Uncached w :      480.617    Kilobytes/second
   8Kb random Uncached r :    53138.414    Kilobytes/second
   8Kb seq.   Cached   w :     2137.880    Kilobytes/second
   8Kb seq.   Cached   r :    31043.096    Kilobytes/second
   8Kb random Cached   w :      478.993    Kilobytes/second
   8Kb random Cached   r :    70876.662    Kilobytes/second
   16K seq.   Uncached w :     2746.962    Kilobytes/second
   16K seq.   Uncached r :    54811.528    Kilobytes/second
   16K random Uncached w :      913.111    Kilobytes/second
   16K random Uncached r :    50839.129    Kilobytes/second
   16K seq.   Cached   w :     1879.169    Kilobytes/second
   16K seq.   Cached   r :    18240.584    Kilobytes/second
   16K random Cached   w :      904.456    Kilobytes/second
   16K random Cached   r :    70210.021    Kilobytes/second
   32K seq.   Uncached w :     3022.258    Kilobytes/second
   32K seq.   Uncached r :    55042.846    Kilobytes/second
   32K random Uncached w :     1672.594    Kilobytes/second
   32K random Uncached r :    58753.036    Kilobytes/second
   32K seq.   Cached   w :     2782.609    Kilobytes/second
   32K seq.   Cached   r :    29839.388    Kilobytes/second
   32K random Cached   w :     1666.103    Kilobytes/second
   32K random Cached   r :    65640.138    Kilobytes/second
   64K seq.   Uncached w :     3001.350    Kilobytes/second
   64K seq.   Uncached r :    34236.385    Kilobytes/second
   64K random Uncached w :     2047.896    Kilobytes/second
   64K random Uncached r :    46046.090    Kilobytes/second
   64K seq.   Cached   w :     2882.142    Kilobytes/second
   64K seq.   Cached   r :    28382.383    Kilobytes/second
   64K random Cached   w :     2078.175    Kilobytes/second
   64K random Cached   r :    63701.238    Kilobytes/second
   -----------------------------------------------------------------------
   Total                 :    22471.517    File I/O-marks
 Memory
   5    kB copy          :     1374.422    Megabytes/second
   10   kB copy          :     1399.101    Megabytes/second
   20   kB copy          :     1355.906    Megabytes/second
   40   kB copy          :      162.150    Megabytes/second
   80   kB copy          :      103.405    Megabytes/second
   160  kB copy          :       99.641    Megabytes/second
   320  kB copy          :       79.739    Megabytes/second
   640  kB copy          :       63.232    Megabytes/second
   1280 kB copy          :       56.458    Megabytes/second
   5    kB read          :      755.233    Megabytes/second
   10   kB read          :      757.576    Megabytes/second
   20   kB read          :      748.295    Megabytes/second
   40   kB read          :      362.572    Megabytes/second
   80   kB read          :      265.280    Megabytes/second
   160  kB read          :      255.598    Megabytes/second
   320  kB read          :      235.262    Megabytes/second
   640  kB read          :      216.810    Megabytes/second
   1280 kB read          :      202.500    Megabytes/second
   5    kB write         :     1223.149    Megabytes/second
   10   kB write         :     1227.099    Megabytes/second
   20   kB write         :     1227.256    Megabytes/second
   40   kB write         :      223.512    Megabytes/second
   80   kB write         :      151.707    Megabytes/second
   160  kB write         :      129.904    Megabytes/second
   320  kB write         :      112.647    Megabytes/second
   640  kB write         :      100.788    Megabytes/second
   1280 kB write         :       93.902    Megabytes/second
   -----------------------------------------------------------------------
   Total                 :      581.296    Memory-marks
 Simultaneous Disk I/O
   Disk 0-1:  4354 MB    :        9.500    Megabytes/second
   Disk 0-2:  4134 MB    :        1.713    Megabytes/second
   Disk 0-3:  2149 MB    :        6.585    Megabytes/second
   Disk 0-4:  1381 MB    :        2.401    Megabytes/second
   -----------------------------------------------------------------------
   Total                 :       20.199    Simultaneous I/O-marks
 Disk I/O disk 0-1:  4354 MB - IBM DDRS-34560W S97B
   Avg. data access time :       12.800    milliseconds
   Cache/Bus xfer rate   :        7.395    Megabytes/second
   Track 0 xfer rate fwd :       12.682    Megabytes/second
   Middle trk rate fwds. :       10.560    Megabytes/second
   Last track rate bwds. :        7.473    Megabytes/second
   Average Transfer rate :       10.238    Megabytes/second
   Disk use CPU load     :        4.760    percent
   -----------------------------------------------------------------------
   Total                 :       60.810    Disk I/O-marks
 Disk I/O disk 0-2:  4134 MB - IBM DCAS-34330W S61A
   Avg. data access time :       15.100    milliseconds
   Cache/Bus xfer rate   :       29.991    Megabytes/second
   Track 0 xfer rate fwd :        7.797    Megabytes/second
   Middle trk rate fwds. :        6.475    Megabytes/second
   Last track rate bwds. :        4.834    Megabytes/second
   Average Transfer rate :        6.368    Megabytes/second
   Disk use CPU load     :        3.180    percent
   -----------------------------------------------------------------------
   Total                 :       42.351    Disk I/O-marks
 Disk I/O disk 0-3:  2149 MB - IBM XP32150W !y 6C43
   Avg. data access time :       13.900    milliseconds
   Cache/Bus xfer rate   :       14.258    Megabytes/second
   Track 0 xfer rate fwd :        6.635    Megabytes/second
   Middle trk rate fwds. :        6.045    Megabytes/second
   Last track rate bwds. :        3.845    Megabytes/second
   Average Transfer rate :        5.508    Megabytes/second
   Disk use CPU load     :        2.700    percent
   -----------------------------------------------------------------------
   Total                 :       36.487    Disk I/O-marks
 Disk I/O disk 0-4:  1381 MB - IBM MTA-3127TC1010!B 0
   Avg. data access time :       12.500    milliseconds
   Cache/Bus xfer rate   :       45.554    Megabytes/second
   Track 0 xfer rate fwd :        8.438    Megabytes/second
   Middle trk rate fwds. :        7.303    Megabytes/second
   Last track rate bwds. :        7.262    Megabytes/second
   Average Transfer rate :        7.668    Megabytes/second
   Disk use CPU load     :        4.310    percent
   -----------------------------------------------------------------------
   Total                 :       51.250    Disk I/O-marks
 CD-ROM I/O disk 0-1:   282 MB - PIONEER CD-ROM DR-124X 1.01
   Avg. data access time :      198.800    milliseconds
   Inner sectors rate    :      667.000    Kilobytes/second (~4.4X)
   Outer sectors rate    :      641.000    Kilobytes/second (~4.3X)
   CD-ROM use CPU load   :        5.860    percent
   -----------------------------------------------------------------------
   Total                 :       35.342    CD I/O-marks
--
-----------------------------------------------------------
Antonio(Nino) Scalisi           
sca...@tin.it
at 21:47(+0200, relative to GMT) on Monday, 17 May 1999
Using MR/2 ICE v1.60  Reg: #20729.
Under ---> OS/2 WARP 4 rev.9.034 (fixpack 10)
Java ver.  1.1.7A build 19990331
ObjREXX 6.00   TCPIP 4.2 - MPTN 6.1002 (TCPIP 4.1 + W08610)
-----------------------------------------------------------