Dell SAS 5i/mpt driver[was: possible issues with Dell/Perc5 raid]

[Randy Schultz]

On Fri, 11 May 2007, Matthew Jacob spaketh thusly:

-}Time frame to resolution involves getting a machine into my lab that
-}evidences the poor performance and the time to sort out what the
-}problem is and fix it. Remote access doesn't work for me on this one
-}(contact me offline as to why).

Hey Matthew,

FWIW, I installed fedora core 5 on the box.  The difference was significant.
Writes, though bursty, increased significantly.  Reads increased by 1-2 orders
of magnitude.  I've attached the output of blogbench for fc5 FWIW.  

Being new to all this, what would be the next step?  Should I file a bug
report?  Or perhaps I should be asking what your timeline is?  All I have to
offer for help is remote access, which in this case doesn't work for you, or
perhaps testing as my C skills are fairly pathetic.  ;>

--
 Randy    (schulra at earlham.edu)      765.983.1283         <*>

Rain puts a hole in stone because of its constancy, not its force.
   - H. Joseph Gerber
-------------- next part --------------
[root at kuthula blogbench-1.0]# blogbench -d /var/tmp

Frequency = 10 secs
Scratch dir = [/var/tmp]
Spawning 3 writers...
Spawning 1 rewriters...
Spawning 5 commenters...
Spawning 100 readers...
Benchmarking for 30 iterations.
The test will run during 5 minutes.

  Nb blogs   R articles    W articles    R pictures    W pictures    R comments    W comments
        37       237399          2107        173345          2000         67965          2491
        37       244253             0        172746             0         69574             0
        41       241636           463        164879           236         82173          1844
        41       235689           401        162620           173        110292             0
        47       229839           434        163066           410        131993          4865
        47       230127            11        163982             9        138213            64
        47       225535            75        160471            40        148491          1608
        47       229080             0        161741             0        155979             0
        47       227574           107        163202            56        170169          1530
        47       225043             0        160170             0        173418             1
        47       218253           501        155804           262        174234          1769
        47       220521            20        162732             8        175987           261
        47       219232             0        161118             0        181003             0
        47       214168             0        155753             0        173938             2
        48       217380            71        158885            95        170132          1269
        48       218617             0        158736             0        171277          1137
        48       223162             0        163134             0        175658           130
        56       222633           363        165740           424        163473          2155
        56       217241             0        160554             0        164768          1803
        56       225575            14        168826             6        177708          2889
        56       211774             0        156324             0        172337           169
        56       214351            56        159275            25        172503          3298
        57       215241           118        161487            62        178817           134
        57       216253           420        162891           200        175501           200
        63       218036           458        162695           428        172255          4061
        63       212352            50        160803            24        173624          6316
        65       219580           289        167847           202        196931          5256
        75       220890           481        165364           578        180439          4192
        85       227401           672        174135           696        184679          4348
       103       232222           805        168824           821        173682          4869

Final score for writes:           103
Final score for reads :        128684