3 ms·

RISC-V Lichee Pi 4A vs. VisionFive 2 vs. HiFive Unmatched vs. Raspberry Pi 4B

3 points by rwmj 3y ago

camel-cdr 3y ago
> The speed test for the Sipeed Lichee was done using the Fedora distribution. There seems to be something very wrong with the measured speed of this board I ran into a similar problem with my mangopi mq pro (c906). On the latest version of ubuntu server the clock frequency was somehow ~3x slower [1]. The Lichee PiA4 is based on the C910 iirc, so maybe it's the same problem. I resolved the issue by staying on an older build for now. [1] https://bugs.launchpad.net/ubuntu/+source/linux-allwinner/+bug/2024935 https://bugs.launchpad.net/ubuntu/+source/linux-allwinner/+b...
brucehoult 3y ago
I've also found the 1.5 GHz in-order VF2 does remarkably well vs the 1.85 GHz OoO LPi4A on software build tasks, though not as extreme as Richard shows. I'm lazy and using the original Image-55 on my 8 GB VF2, and the Debian that came preloaded in the eMMC on the LPi4A. My mass-production LPi4A arrived yesterday, I haven't tried it yet, tests are on the beta board that arrived a couple of months ago. On pure CPU core + L1 cache tests (e.g. https://hoult.org/primes.txt https://hoult.org/primes.txt) the LPi4A is considerably faster. The LPi4A is also much faster on memcpy tests. https://hoult.org/TH1520_memcpy.txt https://hoult.org/TH1520_memcpy.txt https://hoult.org/JH7110_memcpy.txt https://hoult.org/JH7110_memcpy.txt My build test is an RVV 0.7.1-enabled snapshot of the gnu toolchain (gcc 9.2) that I use on the TH1520 and SG2042 (and various chips with C906 cores with RVV 0.7.1). Newlib, non-multilib (just rv64gcv) build. I used the same Samsung 2 TB external USB3 SSD drive for src/build trees on both boards. https://github.com/brucehoult/riscv-gnu-toolchain https://github.com/brucehoult/riscv-gnu-toolchain VF2: real 107m52.116s user 348m49.800s sys 16m27.529s LPi4A: real 122m16.099s user 400m17.737s sys 23m8.567s Neither board is thermal throttling at all. I have the supplied fan sitting loosely on top of the LPi4A CPU (I also try tests without the fan ... it throttles a lot, taking 166m on this test). The VF2 is without a fan -- doesn't need it. The LPi4A has more L1 cache, but only 1 MB of L2 vs 2 MB on the VF2. But the LPi4A's RAM is twice as fast as the VF2's L2 cache! At least for streaming -- I haven't tried random. It's a mystery.

3 points by rwmj 3y ago

> The speed test for the Sipeed Lichee was done using the Fedora distribution. There seems to be something very wrong with the measured speed of this board I ran into a similar problem with my mangopi mq pro (c906). On the latest version of ubuntu server the clock frequency was somehow ~3x slower [1]. The Lichee PiA4 is based on the C910 iirc, so maybe it's the same problem. I resolved the issue by staying on an older build for now. [1] https://bugs.launchpad.net/ubuntu/+source/linux-allwinner/+bug/2024935 https://bugs.launchpad.net/ubuntu/+source/linux-allwinner/+b...

brucehoult 3y ago

I've also found the 1.5 GHz in-order VF2 does remarkably well vs the 1.85 GHz OoO LPi4A on software build tasks, though not as extreme as Richard shows. I'm lazy and using the original Image-55 on my 8 GB VF2, and the Debian that came preloaded in the eMMC on the LPi4A. My mass-production LPi4A arrived yesterday, I haven't tried it yet, tests are on the beta board that arrived a couple of months ago. On pure CPU core + L1 cache tests (e.g. https://hoult.org/primes.txt https://hoult.org/primes.txt) the LPi4A is considerably faster. The LPi4A is also much faster on memcpy tests. https://hoult.org/TH1520_memcpy.txt https://hoult.org/TH1520_memcpy.txt https://hoult.org/JH7110_memcpy.txt https://hoult.org/JH7110_memcpy.txt My build test is an RVV 0.7.1-enabled snapshot of the gnu toolchain (gcc 9.2) that I use on the TH1520 and SG2042 (and various chips with C906 cores with RVV 0.7.1). Newlib, non-multilib (just rv64gcv) build. I used the same Samsung 2 TB external USB3 SSD drive for src/build trees on both boards. https://github.com/brucehoult/riscv-gnu-toolchain https://github.com/brucehoult/riscv-gnu-toolchain VF2: real 107m52.116s user 348m49.800s sys 16m27.529s LPi4A: real 122m16.099s user 400m17.737s sys 23m8.567s Neither board is thermal throttling at all. I have the supplied fan sitting loosely on top of the LPi4A CPU (I also try tests without the fan ... it throttles a lot, taking 166m on this test). The VF2 is without a fan -- doesn't need it. The LPi4A has more L1 cache, but only 1 MB of L2 vs 2 MB on the VF2. But the LPi4A's RAM is twice as fast as the VF2's L2 cache! At least for streaming -- I haven't tried random. It's a mystery.