Arm64 Memory Architecture: DMA Buffer Performance and Cache Coherence Deep Dive
Performance Anomaly Investigation
During performance profiling on an Arm64 embedded platform, we encountered a puzzling behavior with dma-buf memory regions. Benchmarking memcpy() operations revealed a tenfold performance disparity:
Operation Direction
Duration (1MB buffer)
dma-buf → heap
550 μs
heap → dma-buf
49 μs
This asymmetry c ...
Posted on Thu, 13 Aug 2026 16:46:33 +0000 by azwebdiva