| openpowerbot | [slack] <mithro> Hi everyone! I would like to introduce you to @Arya Reais-Parsi who was previously at Google in Australia and now a PhD candidate at Berkeley and also a visiting student researcher here on my team -- He has been working with @Anton Blanchard on the bigspicy tool - https://github.com/google/bigspicy | 01:27 |
|---|---|---|
| openpowerbot | [slack] <mithro> Hi everyone! I would like to introduce you to @Arya Reais-Parsi who was previously at Google in Australia and now a PhD candidate at Berkeley and also a visiting student researcher here on my team -- He has been working with @Anton Blanchard on the bigspicy tool - https://github.com/google/bigspicy | 01:27 |
| openpowerbot | [slack] <Arya Reais-Parsi> thanks Tim! 🙏 | 01:27 |
| openpowerbot | [slack] <Arya Reais-Parsi> thanks Tim! 🙏 good to be here | 01:27 |
| openpowerbot | [slack] <Jeremy Kerr> hi Arya! | 02:57 |
| openpowerbot | [mattermost] <lkcl> ben: "Full HD at 60Hz is half a gigabyte/s afaik" - no, it's half a gigabyte/sec of an application writing to the framebuffer **and** it's half a gigabyte/sec of the Bus Master absolute top-priority peripheral doing scan-line **reading** of that exact same framebuffer. | 14:15 |
| openpowerbot | [mattermost] <lkcl> 1920*1080*60*4 bytes / 1e6 = 497. times two, one for read, one for write. | 14:15 |
| openpowerbot | [mattermost] <lkcl> this is the reason why the Allwinner A20 slowed down by 20% because the 32-bit DDR3 Memory Controller @ around 800 mhz could only supply 3.2 gbytes/sec where the Bus Master LCD/HDMI peripheral was consuming half a gigabyte/sec *reading* from the framebuffer | 14:18 |
| openpowerbot | [mattermost] <lkcl> but, hey, it was only a 3.5 watt processor and cost $4 including the AXP209 Power-Management IC. nobody was complaining: the performance drop was factored in to the software by the IPTV Set-Top-Box OEMs. | 14:19 |
| openpowerbot | [mattermost] <lkcl> Texas Instruments does specialist HD OMAP Series SoCs, they had dual 32-bit DDR3 1600 mhz interfaces, consuming a whopping **two watts** each interface. | 14:21 |
| openpowerbot | [mattermost] <lkcl> bottom line you have to be extremely careful about how you go about designing the SoC fabric and make power / thermal / application design decisions *right at the damn start*. kinda annoying :) | 14:23 |
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