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| FUZxxl | mntmn: didn't you say something about the LS1046A being a possible alternative SoC for the Reform? | 16:39 |
|---|---|---|
| mntmn | FUZxxl: rbz+us are developing a LS1028A SOM | 16:42 |
| FUZxxl | mntmn: Ah, I see. Seems like I have confused the product numbers. | 16:42 |
| FUZxxl | (LS1046A support has landed in FreeBSD HEAD today) | 16:42 |
| mntmn | cool | 16:45 |
| mntmn | the 1028A has the same vivante GC7000L gpu as imx8m | 16:45 |
| mntmn | but it can address more memory and has bigger pcie address space | 16:45 |
| mntmn | it is dual cortex-a72 vs quad cortex-a53 of imx8mq. | 16:45 |
| FUZxxl | that sounds cool | 16:46 |
| FUZxxl | Cortex A72---that's the same core used in the RPi 4B | 16:46 |
| FUZxxl | I've written some SIMD code for that chip in the last weeks | 16:47 |
| FUZxxl | the performance is okay, but not stellar | 16:47 |
| FUZxxl | might also be because the SIMD units have at least a 3 cycle latency on all operations | 16:47 |
| FUZxxl | SIMD performance is about 1/4 the speed of my Haswell-based laptop (using 128 bit vectors on both; if I use AVX on the Haswell box it gets a lot worse) | 16:49 |
| + oomono (uid328183@gateway/web/irccloud.com/x-vwfaejnbcbysaptk) | 17:03 | |
| mntmn | FUZxxl: interesting | 17:28 |
| mntmn | FUZxxl: anything public? | 17:29 |
| FUZxxl | mntmn: https://github.com/clausecker/pospop | 17:30 |
| FUZxxl | you need to build a Go toolchain from master as the code requires some recently added extensions to the assembler to work. | 17:31 |
| FUZxxl | If you build with an older toolchain, the SIMD version won't be built | 17:31 |
| mntmn | FUZxxl: interesting! is the perf tied to caches as well? | 17:32 |
| FUZxxl | mntmn: the ARM64 code doesn't have prefetching added yet | 17:33 |
| FUZxxl | on x86, cache size makes a huge difference | 17:34 |
| FUZxxl | it eventually regresses to being main memory bound | 17:34 |
| mntmn | ok | 17:35 |
| FUZxxl | though that's only after the L3 cache is exhausted | 17:35 |
| FUZxxl | on the Cortex-A72, there doesn't really seem to be an effect | 17:35 |
| FUZxxl | I'm getting the same performance for each buffer size. Perhaps the code is too slow for memory bandwidth to matter? | 17:35 |
| FUZxxl | It only reaches around 3.6 GB/s | 17:36 |
| - bachler (QUIT: Ping timeout: 258 seconds) (~bachler@ip200.dorrhaken1.se) | 17:37 | |
| mntmn | FUZxxl: really interesting. i should run it on the LS1028A and the LX2160A when i have the time | 18:18 |
| FUZxxl | mntmn: cool! You can run the tests with ' go get github.com/clausecker/pospop; go test -bench=. github.com/clausecker/pospop' | 18:21 |
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