Mike O'Connor wrote:
 
> Felix Miata wrote:
 
> >My Promise Ultra 100TX2 produces dismal Simultaneous Disk I/O
> >performance on Sysbench 0.9.5 with my Seagate Barracuda IV 60GB:

> > Disk I/O disk 0-1: 57239 MB - ST360021A
> >   Avg. data access time :       14.700    milliseconds
> >   Cache/Bus xfer rate   :       23.604    Megabytes/second
> >*  Track 0 xfer rate fwd :       15.218    Megabytes/second
> >   Middle trk rate fwds. :       15.796    Megabytes/second
> >** Last track rate bwds. :       20.660    Megabytes/second
> >   Average Transfer rate :       17.225    Megabytes/second
> >   Disk use CPU load     :        3.610    percent
 
> I wouldn't give any credence whatsoever to a benchmark that rates a last
> track backwards faster than a trk0 forwards!
> Those numbers are barely faster than PIO4.

I've seen poorer front of disk performance before with 0.9.4g, usually
on Maxtor ATA drives. The Sysbench author explained it then as a quirk
of the interplay between dish cache algorythm and the tests.

Those above are from the motherboard controller, VIA MVP3, far from an
ideal piece of hardware. Note that the simultaneous was better for the
Seagate on this controller than on the TX2.

Same two disks, same Sysbench, motherboard ATA100 (KT400):

 Simultaneous Disk I/O
   Disk 0-1: 78529 MB    :       54.271    Megabytes/second
   Disk 1-2: 57239 MB    :       39.165    Megabytes/second
  
-----------------------------------------------------------------------
   Total                 :       93.436    Simultaneous I/O-marks

 Disk I/O disk 0-1: 78529 MB - IC35L090AVV207-0
   Avg. data access time :       12.100    milliseconds
   Cache/Bus xfer rate   :       87.868    Megabytes/second
   Track 0 xfer rate fwd :       54.494    Megabytes/second
   Middle trk rate fwds. :       47.119    Megabytes/second
   Last track rate bwds. :       32.420    Megabytes/second
   Average Transfer rate :       44.678    Megabytes/second
   Disk use CPU load     :        4.490    percent
  
-----------------------------------------------------------------------
   Total                 :      258.614    Disk I/O-marks

 Disk I/O disk 1-2: 57239 MB - ST360021A
   Avg. data access time :       14.500    milliseconds
   Cache/Bus xfer rate   :       57.803    Megabytes/second
   Track 0 xfer rate fwd :       39.559    Megabytes/second
   Middle trk rate fwds. :       38.247    Megabytes/second
   Last track rate bwds. :       23.682    Megabytes/second
   Average Transfer rate :       33.829    Megabytes/second
   Disk use CPU load     :        3.940    percent
  
-----------------------------------------------------------------------
   Total                 :      196.357    Disk I/O-marks

Other controllers produced similar relationships between the performance
of these two disks, quite unlike that on the TX2.
-- 
"Each one should use whatever gift he has received to serve others..."
                                                1 Peter 4:10 NIV

 Team OS/2 ** Reg. Linux User #211409

Felix Miata  ***  http://members.ij.net/mrmazda/



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