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3w-9xxx performance bug in kernel 3.1.0-amd64

Hi,
I've got a testing amd64 system with two 3Ware 9500S controllers
and performance with the newest kernel is dramatically
slower than with 2.6.32-5-amd64.  Also response to tw_cli
and 3dm2 is glacial.  Possibly an IRQ issue?

Anyway my question is what list is best to ask about this
problem.  Or should I just go ahead and file a bug report
(my first)?  Bonnie++ output appended.

Thanks,
Russell

** Linux berlin 2.6.32-5-amd64 #1 SMP Thu Nov 3 03:41:26 UTC 2011 x86_64 GNU/Linux
   rcarter@berlin> /usr/sbin/bonnie++ -d /d1/tmp
   Writing a byte at a time...done
   Writing intelligently...done
   Rewriting...done
   Reading a byte at a time...done
   Reading intelligently...done
   start 'em...done...done...done...done...done...
   Create files in sequential order...done.
   Stat files in sequential order...done.
   Delete files in sequential order...done.
   Create files in random order...done.
   Stat files in random order...done.
   Delete files in random order...done.
   Version  1.96       ------Sequential Output------ --Sequential Input- --Random-
   Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
   Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
   berlin          16G   376  98 84523  15 36035   6  1808  97 223527  20 206.4   1
   Latency             21484us     230ms     354ms   19199us   65485us     824ms
   Version  1.96       ------Sequential Create------ --------Random Create--------
   berlin              -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
   files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
   16 20902  61 +++++ +++ 25927  54 25286  62 +++++ +++ 28831  57
   Latency               296us     663us    1672us     177us      30us      52us

1.96,1.96,berlin,1,1322808950,16G,,376,98,84523,15,36035,6,1808,97,223527,20,206.4,1,16,,,,,20902,61,+++++,+++,25927,54,25286,62,+++++,+++,28831,57,21484us,230ms,354ms,19199us,65485us,824ms,296us,663us,1672us,177us,30us,52us
   rcarter@berlin>

** Linux berlin 3.1.0-1-amd64 #1 SMP Mon Nov 14 08:02:25 UTC 2011 x86_64
rcarter@berlin> /usr/sbin/bonnie++ -d /d1/tmp
Writing a byte at a time...done
Writing intelligently...done
Rewriting...done
Reading a byte at a time...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version  1.96       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
berlin          16G   495  89 27134   4  1422   0  1443  58  3251   0  77.9   0
Latency             15666us     923ms    1610ms   96817us     459ms    1200ms
Version  1.96       ------Sequential Create------ --------Random Create--------
berlin              -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16  9623  19 +++++ +++ 19726  33 14990  29 +++++ +++ 19520  26
Latency             40757us     587us    1405us     416us      16us     966us
1.96,1.96,berlin,1,1322795929,16G,,495,89,27134,4,1422,0,1443,58,3251,0,77.9,0,16,,,,,9623,19,+++++,+++,19726,33,14990,29,+++++,+++,19520,26,15666us,923ms,1610ms,96817us,459ms,1200ms,40757us,587us,1405us,416us,16us,966us
rcarter@berlin>
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