[Differential] [Request, 20 lines] D1699: sfxge: Remove extra cache-line alignment and reorder sfxge_evq_t

Wed Jan 28 08:31:22 UTC 2015

arybchik created this revision.
arybchik added a reviewer: gnn.
arybchik added a subscriber: freebsd-net.

REVISION SUMMARY
  Remove the first member alignment to cacheline since it is nop.
  Use __aligned() for the whole structure to make sure that the structure
  size is cacheline aligned.
  Remove lock alignment to make the structure smaller and fit all members
  used on event queue processing into one cacheline (128 bytes) on x86-64.
  The lock is obtained as well from different context when event queue
  statistics are retrived from sysctl context, but it is infrequent.
  Reorder members to avoid padding and go in usage order on event
  processing.

BRANCH
  /head

REVISION DETAIL
  https://reviews.freebsd.org/D1699

AFFECTED FILES
  sys/dev/sfxge/sfxge.h

To: arybchik, gnn
Cc: freebsd-net