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author | Sirshak Das <sirshak.das@arm.com> | 2019-02-05 01:33:33 -0600 |
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committer | Florin Coras <florin.coras@gmail.com> | 2019-04-16 19:33:21 +0000 |
commit | 28aa539f7da7b172d0f35ea9a63f3986939477f7 (patch) | |
tree | be856eb44878b604b2fc93beffb7268db77b457b /src/vppinfra/qhash.c | |
parent | 39d04099467414175803273433c95a96c0276252 (diff) |
svm_fifo rework to avoid contention on cursize
Problems Addressed:
- Contention of cursize by producer and consumer.
- Reduce the no of modulo operations.
Changes:
- Synchronization between producer and consumer changed from cursize
to head and tail indexes
Implications: reduces the usable size of fifo by 1.
- Using weaker memory ordering C++11 atomics to access head and tail
based on producer and consumer role.
- Head and tail indexes are unsigned 32 bit integers. Additions and
subtraction on them are implicit 32 bit Modulo operation.
- Adding weaker memory ordering variants of max_enq, max_deq, is_empty
and is_full Using them appropriately in all places.
Perfomance improvement (iperf3 via Hoststack):
iperf3 Server: Marvell ThunderX2(AArch64) - iperf3 Client: Skylake(x86)
~6%(256 rxd/txd) - ~11%(2048 rxd/txd)
Change-Id: I1d484e000e437430fdd5a819657d1c6b62443018
Signed-off-by: Sirshak Das <sirshak.das@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Diffstat (limited to 'src/vppinfra/qhash.c')
0 files changed, 0 insertions, 0 deletions