ru.unix.bsd

 
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 From : Slawa Olhovchenkov                   2:5030/500     27 Dec 2005  15:11:08
 To : All
 Subject : Вести с полей
 -------------------------------------------------------------------------------- 
 

 
 scottl      2005-12-14 03:26:49 UTC
 
   FreeBSD src repository
 
   Modified files:
     sys/dev/amr          amr.c amr_cam.c amr_disk.c amr_pci.c
                          amrio.h amrreg.h amrvar.h
   Log:
   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 Ambrosko, LSI, Dell, and Yahoo for contributing towards
   this.
 ... Пpи пожаpе звонить ATDP901^M
 --- GoldED+/BSD 1.1.5
  * Origin:  (2:5030/500)
 
 

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