huchuan2025/10-Project/102-上班/心得/测量结果.md

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- A55@1.0Ghz 8nm 2核100% 大约120mW
- DDR @594Mhz
- 规格 16bit 594Mhz
- 理论带宽
- 594x2x4 = 4752MBps 4.75GBps
- 读数据(bwmem rd) 4.4GBps
- 利用工具读出来的 bwmem在单进程时看似统计值反而不准(<span style="color:#ff0000">结果偏大几乎是2倍</span> 是不是因为单进程跑的自己x2了)
- 需要双核才能跑出来这个数据单cpu只能压到3.1GBps
- ==读效率 92.6%==
- 读数据(bwmem frd) 3.8GBps
- ==读效率 80%==
- 写数据 读写总共2.85GBps
- 写1.43GBps
- 读1.43GBps
- tick 4ms
- bpm工具从20ms到1000ms都准可以和bw_mem的数据基本对上。
- ------------------
- DDR @512Mhz
- 规格 16bit 512Mhz
- 理论带宽
- 512\*8=4096MBps 4.096GBps
- 读数据 3.75GBps
- bw_mem -P 4 -N 2 1024000 rd
- rd 1.02 3755.51
- 没复现上面结果偏大的问题
- 读效率
- 3.755 / 4.096 = 91.67%