Antti
/ latency.txt
Created
December 20, 2018 11:18
— forked from jboner/latency.txt
Latency Numbers Every Programmer Should Know
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| Latency Comparison Numbers (~2012) | |
| ---------------------------------- | |
| L1 cache reference 0.5 ns | |
| Branch mispredict 5 ns | |
| L2 cache reference 7 ns 14x L1 cache | |
| Mutex lock/unlock 25 ns | |
| Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
| Compress 1K bytes with Zippy 3,000 ns 3 us | |
| Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
| Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
Antti
/ Neewer-RGB660_PRO_ReverseEngNotes.txt
Created
January 20, 2022 23:59
— forked from JDogHerman/Neewer-RGB660_PRO_ReverseEngNotes.txt
Notes on the reverse engineering of the data for the Neewer-RGB660 PRO leveraging bluetooth low energy.
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| Notes on the reverse engineering of the data for the Neewer-RGB660 PRO leveraging bluetooth low energy. | |
| NEEWER-RGB660 PRO | |
| 02 41 00 0C 00 08 00 04 00 52 0E 00 78 81 01 01 FB | |
| Preamble 02 04 00 0C 00 08 00 04 00 52 0E 00 Value 78 81 01 01 FB | |
| Service UUID: 69400001b5a3f393e0a9e50e24dcca99 | |
| Caracteristic: 69400002b5a3f393e0a9e50e24dcca99 | |
| Properties: WRITE, WRITE NO RESPONSE |
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