HydraBus microSD read performance

• HydraFW (HydraBus/HydraNFC) v0.1-beta-5-g8c2baea 8c2baea-dirty
• Kernel: 3.0.0dev
• Compiler: GCC 4.7.4 20130913 (release) [ARM/embedded-4_7-branch revision 202601]
• Architecture: ARMv7-ME
• Core Variant: Cortex-M4F
• Port Info: Advanced kernel mode
• Platform: STM32F405 High Performance with DSP and FPU
• Board: HydraBus 1.0
• HydraNFC Shield not present/not detected

Note: Those performances are limited mainly by chibios driver which limit SD frequency to 24MHz (and we are using SD mode with 4bits which in best case will be 12MB/s without including SD protocol overhead).

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microSD Samsung 4GB Class4 (with Windows SDCard reader 18MB/s)
Windows SDCard reader perf linear:
- 8KB blocks 7.25MB/s
- 16KB blocks 11MB/s
- 64KB blocks 18MB/s
>sd_rperfo
Connecting... OK
 
Card Info
CSD : 400E0032 5B590000 1D4D7F80 0A400034
CID : 1B534D30 30303030 10116062 1D00DB5A
Mode : SDV20
Capacity : 3751MB
Aligned read perf:
Single block(1 sector): 13248 blocks/s, 3312 KB/s 3.23 MB/s
Sequential blocks(128 sectors): 44288 blocks/s, 11072 KB/s 10.81 MB/s
Unaligned read perf:
Single block(1 sector): 11387 blocks/s, 2846 KB/s 2.78 MB/s
Sequential blocks(128 sectors): 11648 blocks/s, 2912 KB/s 2.84 MB/s

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microSD Lexar HIGH-SPEED 8GB Class10 (with Windows SDCard reader 17.7MB/s)
Windows SDCard reader perf linear:
- 8KB blocks 6MB/s
- 16KB blocks 9.75MB/s
- 64KB blocks 18MB/s
>sd_rperfo
Connecting... OK
 
Card Info
CSD : 400E0032 5B590000 3BAD7F80 0A4000C4
CID : 28424520 20202020 10980822 1700D5AE
Mode : SDV20
Capacity : 7639MB
Aligned read perf:
Single block(1 sector): 6116 blocks/s, 1529 KB/s 1.49 MB/s
Sequential blocks(128 sectors): 42752 blocks/s, 10688 KB/s 10.43 MB/s
Unaligned read perf:
Single block(1 sector): 5699 blocks/s, 1424 KB/s 1.39 MB/s
Sequential blocks(128 sectors): 6272 blocks/s, 1568 KB/s 1.53 MB/s

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microSD SanDisk Extreme 32GB UHS1
Windows SDCard reader perf linear:
- 8KB blocks 7MB/s
- 16KB blocks 10.8MB/s
- 64KB blocks 18MB/s
>sd_rperfo
Connecting... OK
 
Card Info
CSD : 400E0032 5B590000 EDC87F80 0A4040C2
CID : 03534453 45333247 800A9951 8C00DCBA
Mode : SDV20
Capacity : 30436MB
Aligned read perf:
Single block(1 sector): 6713 blocks/s, 1678 KB/s 1.63 MB/s
Sequential blocks(128 sectors): 43264 blocks/s, 10816 KB/s 10.56 MB/s
Unaligned read perf:
Single block(1 sector): 6662 blocks/s, 1665 KB/s 1.62 MB/s
Sequential blocks(128 sectors): 6656 blocks/s, 1664 KB/s 1.62 MB/s