K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2012-11-23T14:00:26.970328Z
K 7
svn:log
V 681
  Collect IP statistics in per-cpu 64-bit counters. This way we shoot
two hares with one shot:

  - Parallel threads no longer invalidate the cache lines where
    old struct ipstat resided.
  - Parallel non-atomic writes no longer lose statistics.

  Old 'struct ipstat' left only as interface to userland, however
all fields converted to uint64_t. Yes, this break ABI on 32-bit arches,
but now statistics will not overflow.
  Old 'struct ipstat' was imported as SYSCTL_STRUCT(... CTLFLAG_RW ...),
thus could not be only zeroed, but filled in with fake values. This is
no longer possible - any attempt to write to statictics zeroes them,
without accepting userland supplied info.

END