Just tried with the data cache enabled, i had disable it since normally never use it, i use a lot of DMA transfers (Usart RX&TX, SPI for external memory access, SPI for WS2812 control, ADC) and want to avoid some issues.
The performance boost is quite significant in this board. In this case the LV_COLOR was set to 32, and using Double Buffer (34 rows), with LV_USE_GPU_STM32_DMA2D enabled.
But the tearing was still noticeable, less than before, but still noticeable in the rectangle tests. But is a no issue, probably the only real workaround would be to have a real “double buffer” in the external RAM for the full Display contents, and switch the buffer in use with the VSYNC signal.
| Test | Only I Cache | D Cache and I Cache |
|---|---|---|
| Weighted FPS | 128 | 183 |
| Opa. speed | 93 | 94 |
| Rectangle | 193 | 238 |
| Rectangle + opa | 114 | 107 |
| Rectangle rounded | 110 | 152 |
| Rectangle rounded + opa | 75 | 86 |
| Circle | 50 | 77 |
| Circle + opa | 25 | 45 |
| Border | 164 | 200 |
| Border + opa | 151 | 193 |
| Border rounded | 119 | 162 |
| Border rounded + opa | 107 | 150 |
| Circle border | 38 | 58 |
| Circle border + opa | 34 | 55 |
| Border top | 144 | 194 |
| Border top + opa | 139 | 194 |
| Border left | 58 | 82 |
| Border left + opa | 58 | 82 |
| Border top + left | 52 | 76 |
| Border top + left + opa | 41 | 66 |
| Border left + right | 52 | 76 |
| Border left + right + opa | 41 | 66 |
| Border top + bottom | 126 | 171 |
| Border top + bottom + opa | 113 | 164 |
| Shadow small | 26 | 46 |
| Shadow small + opa | 26 | 46 |
| Shadow small offset | 16 | 26 |
| Shadow small offset + opa | 15 | 26 |
| Shadow large | 11 | 21 |
| Shadow large + opa | 10 | 21 |
| Shadow large offset | 9 | 17 |
| Shadow large offset + opa | 9 | 17 |
| Image RGB | 727 | 761 |
| Image RGB + opa | 615 | 820 |
| Image ARGB | 543 | 800 |
| Image ARGB + opa | 592 | 800 |
| Image chorma keyed | 137 | 309 |
| Image chorma keyed + opa | 96 | 234 |
| Image indexed | 65 | 162 |
| Image indexed + opa | 57 | 137 |
| Image alpha only | 88 | 163 |
| Image alpha only + opa | 75 | 144 |
| Image RGB recolor | 82 | 189 |
| Image RGB recolor + opa | 82 | 188 |
| Image ARGB recolor | 87 | 235 |
| Image ARGB recolor + opa | 75 | 189 |
| Image chorma keyed recolor | 96 | 236 |
| Image chorma keyed recolor + opa | 82 | 189 |
| Image indexed recolor | 57 | 137 |
| Image indexed recolor + opa | 51 | 121 |
| Image RGB rotate | 41 | 138 |
| Image RGB rotate + opa | 34 | 98 |
| Image RGB rotate anti aliased | 14 | 39 |
| Image RGB rotate anti aliased + opa | 13 | 35 |
| Image ARGB rotate | 40 | 123 |
| Image ARGB rotate + opa | 36 | 109 |
| Image ARGB rotate anti aliased | 13 | 36 |
| Image ARGB rotate anti aliased + opa | 13 | 36 |
| Image RGB zoom | 46 | 159 |
| Image RGB zoom + opa | 39 | 122 |
| Image RGB zoom anti aliased | 16 | 43 |
| Image RGB zoom anti aliased + opa | 14 | 39 |
| Image ARGB zoom | 46 | 160 |
| Image ARGB zoom + opa | 42 | 139 |
| Image ARGB zoom anti aliased | 15 | 41 |
| Image ARGB zoom anti aliased + opa | 14 | 41 |
| Text small | 28 | 53 |
| Text small + opa | 28 | 53 |
| Text medium | 28 | 53 |
| Text medium + opa | 28 | 51 |
| Text large | 29 | 54 |
| Text large + opa | 28 | 53 |
| Text small compressed | 20 | 39 |
| Text small compressed + opa | 20 | 38 |
| Text medium compressed | 14 | 29 |
| Text medium compressed + opa | 15 | 29 |
| Text large compressed | 7 | 16 |
| Text large compressed + opa | 7 | 15 |
| Line | 59 | 90 |
| Line + opa | 57 | 87 |
| Arc think | 52 | 72 |
| Arc think + opa | 48 | 70 |
| Arc thick | 52 | 71 |
| Arc thick + opa | 46 | 68 |
| Substr. rectangle | 58 | 82 |
| Substr. rectangle + opa | 59 | 82 |
| Substr. border | 100 | 139 |
| Substr. border + opa | 100 | 140 |
| Substr. shadow | 13 | 22 |
| Substr. shadow + opa | 13 | 22 |
| Substr. image | 551 | 780 |
| Substr. image + opa | 607 | 800 |
| Substr. line | 54 | 84 |
| Substr. line + opa | 54 | 85 |
| Substr. arc | 45 | 64 |
| Substr. arc + opa | 45 | 64 |
| Substr. text | 24 | 46 |
| Substr. text + opa | 24 | 46 |