cvs commit: src/sys/dev/sk if_sk.c if_skreg.h

[Pyun YongHyeon]

yongari     2008-02-14 01:10:49 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/sk           if_sk.c if_skreg.h 
  Log:
  Nuke local jumbo allocator and switch to use of UMA backed page
  allocator for jumbo frame.
   o Removed unneeded jlist lock which was used to manage jumbo
     buffers.
   o Don't reinitialize hardware if MTU was not changed.
   o Added additional check for minimal MTU size.
   o Added a new tunable hw.skc.jumbo_disable to disable jumbo frame
     support for the driver. The tunable could be set for systems that
     do not need to use jumbo frames and it would save
     (9K * number of Rx descriptors) bytes kernel memory.
   o Jumbo buffer allocation failure is no longer critical error for
     the operation of sk(4). If sk(4) encounter the allocation failure
     it just disables jumbo frame support and continues to work without
     user intervention.
  
  With these changes jumbo frame performance of sk(4) was slightly
  increased and users should not encounter jumbo buffer allocation
  failure. Previously sk(4) tried to allocate physically contiguous
  memory, 3388KB for 256 Rx descriptors. Sometimes that amount of
  contiguous memory region could not be available for running systems
  which in turn resulted in failure of loading the driver.
  
  Tested by:      Cy Schubert < Cy.Schubert () komquats dot com >
  
  Revision  Changes    Path
  1.140     +141 -261  src/sys/dev/sk/if_sk.c
  1.42      +1 -34     src/sys/dev/sk/if_skreg.h