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| author |   Lijian.Zhang <Lijian.Zhang@arm.com> | 2019-07-08 10:33:34 +0800 |
|---|---|---|
| committer |   Damjan Marion <dmarion@me.com> | 2019-09-11 19:20:27 +0000 |
| commit | 86b1871ba212064ceb985be4a6b655ebfe2e32f9 (patch) | |
| tree | 71d0e9bb6e98a76f79628fdd72f91312b470e30d /docs | |
| parent | 840f64b4b2d6063adebb8c7b31c9357aaaf8dd5e (diff) | |
ip: apply dual loop unrolling in ip4_input
Too many prefetches within loop unrollings induce bottleneck and
performance degradation on some CPUs which have less cache line fill
buffers, e.g, Arm Cortex-A72.
Apply dual loop unrolling and tune prefetches manually to resolve
hot-spot with prefetch instructions.
It saves about 11.5% cycles with ip4_input node on Cortex-A72 CPUs.
Type: feature
Change-Id: I1ac9eb21061a804af2a414b420217fbcda3689c9
Signed-off-by: Lijian Zhang <Lijian.Zhang@arm.com>
Diffstat (limited to 'docs')
0 files changed, 0 insertions, 0 deletions