Bug 448506

=Comment: #0=================================================
Dinakar Guniguntala <Dinakar.G.com> - 2008-05-26 10:42 EDT
Problem description:
  PI fails everytime with Java testcase with the new -57 kernel

  -------------------------------
  Priority Inheritance
  -------------------------------

  Perform concurrent calculations using normal priority threads
  with two low/high priority threads both sharing a common lock.
  High priority lock acquisition maximum delay: 21.26 ms
  Low priority lock held time: 5.970 ms
  Checks maximum delay < low thread lock held time + 200 µs : FAIL

  With earlier kernels it was something like this below

  -------------------------------
  Priority Inheritance
  -------------------------------

  Perform concurrent calculations using normal priority threads
  with two low/high priority threads both sharing a common lock.
  High priority lock acquisition maximum delay: 5.496 ms
  Low priority lock held time: 5.980 ms
  Checks maximum delay < low thread lock held time + 200 µs : PASS

Provide output from "uname -a", if possible:

  Linux rt-ipe.austin.ibm.com 2.6.24.7-57ibmrt2.3 #1 SMP PREEMPT RT Wed May 21
19:51:04 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux


Hardware Environment
  HS21

Additional Information:

 2.6.24.7-57ibmrt2.3 is exactly the same as the RH 2.6.24.7-57 kernel.

 To avoid a application hang documented in bug 44781 (RH446397)
 the following was set before running the application

 echo 1 >/proc/sys/kernel/rwlock_reader_limit