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numam-dpdk/lib/librte_ring
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Olivier Matz a3d6026711 ring: relax alignment constraint on ring structure 
The initial objective of
commit d9f0d3a1ff ("ring: remove split cacheline build setting")
was to add an empty cache line between the producer and consumer
data (on platform with cache line size = 64B), preventing from
having them on adjacent cache lines.

Following discussion on the mailing list, it appears that this
also imposes an alignment constraint that is not required.

This patch removes the extra alignment constraint and adds the
empty cache lines using padding fields in the structure. The
size of rte_ring structure and the offset of the fields remain
the same on platforms with cache line size = 64B:

  rte_ring = 384
  rte_ring.name = 0
  rte_ring.flags = 32
  rte_ring.memzone = 40
  rte_ring.size = 48
  rte_ring.mask = 52
  rte_ring.prod = 128
  rte_ring.cons = 256

But it has an impact on platform where cache line size is 128B:

  rte_ring = 384        -> 768
  rte_ring.name = 0
  rte_ring.flags = 32
  rte_ring.memzone = 40
  rte_ring.size = 48
  rte_ring.mask = 52
  rte_ring.prod = 128   -> 256
  rte_ring.cons = 256   -> 512

Suggested-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
2018-04-18 00:24:22 +02:00
..
Makefile ring: relax alignment constraint on ring structure 2018-04-18 00:24:22 +02:00
meson.build build: replace license text with SPDX tag 2018-01-30 21:58:59 +01:00
rte_ring_c11_mem.h ring: convert license headers to SPDX tags 2018-02-01 01:46:45 +01:00
rte_ring_generic.h ring: convert license headers to SPDX tags 2018-02-01 01:46:45 +01:00
rte_ring_version.map lib: remove unused map symbols 2018-02-13 14:55:01 +01:00
rte_ring.c ring: convert license headers to SPDX tags 2018-02-01 01:46:45 +01:00
rte_ring.h ring: relax alignment constraint on ring structure 2018-04-18 00:24:22 +02:00