cvs commit: src/sys/dev/amr amr.c amr_cam.c amr_compat.h amr_disk.c amr_linux.c amr_pci.c amrio.h amrreg.h amrvar.h

[Doug Ambrisko]

ambrisko    2006-01-26 22:04:21 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_6)
    sys/dev/amr          amr.c amr_cam.c amr_disk.c amr_pci.c 
                         amrio.h amrreg.h amrvar.h 
  Added files:           (Branch: RELENG_6)
    sys/dev/amr          amr_linux.c 
  Removed files:         (Branch: RELENG_6)
    sys/dev/amr          amr_compat.h 
  Log:
  Sync to -current Scott's Mega Update, fixes and Linux ioctl wrapper.
  
    Mega update to the LSI MegaRAID driver:
  
    1.  Implement a large set of ioctl shims so that the Linux management apps
    from LSI will work.  This includes infrastructure to support adding, deleting
    and rescanning arrays at runtime.  This is based on work from Doug Ambrosko,
    heavily augmented by LSI and Yahoo.
  
    2.  Implement full 64-bit DMA support.  Systems with more than 4GB of RAM
    can now operate without the cost of bounce buffers.  Cards that cannot do
    64-bit DMA will automatically revert to using bounce buffers.  This option
    can be forced off by setting the 'hw.amr.force_sg32" tunable in the loader.
    It should only be turned off for debugging purposes.  This work was sponsored
    by Yahoo.
  
    3.  Streamline the command delivery and interrupt handler paths after
    much discussion with Dell and LSI.  The logic now closely matches the
    intended design, making it both more robust and much faster.  Certain
    i/o failures under heavy load should be fixed with this.
  
    4.  Optimize the locking.  In the interrupt handler, the card can be checked
    for completed commands without any locks held, due to the handler being
    implicitely serialized and there being no need to look at any shared data.
    Only grab the lock to return the command structure to the free pool.  A
    small optimization can still be made to collect all of the completions
    together and then free them together under a single lock.
  
    Items 3 and 4 significantly increase the performance of the driver.  On an
    LSI 320-2X card, transactions per second went from 13,000 to 31,000 in my
    testing with these changes.  However, these changes are still fairly
    experimental and shouldn't be merged to 6.x until there is more testing.
  
    Thanks to Doug Ambrisko, LSI, Dell, and Yahoo for contributing towards
    this.
  
  These have now had more testing and Scott requested them to be merged
  before the freeze.
  
  Revision  Changes    Path
  1.65.2.3  +759 -218  src/sys/dev/amr/amr.c
  1.15.2.1  +10 -16    src/sys/dev/amr/amr_cam.c
  1.6.12.1  +0 -108    src/sys/dev/amr/amr_compat.h (dead)
  1.35.2.1  +8 -27     src/sys/dev/amr/amr_disk.c
  1.1.2.1   +191 -0    src/sys/dev/amr/amr_linux.c (new)
  1.29.2.1  +123 -65   src/sys/dev/amr/amr_pci.c
  1.6.8.1   +1 -1      src/sys/dev/amr/amrio.h
  1.8.2.1   +52 -8     src/sys/dev/amr/amrreg.h
  1.26.2.1  +31 -39    src/sys/dev/amr/amrvar.h