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<davidlt>
morning
<davidlt>
Interesting, glibc build on Unmatched ~7:30, on Pioneer ~16:20 hours. Pioneer spent most of the time trying to write out RPMs spinning all 64 cores at 100%.
<sorear>
this does seem more plausible than the best theory I had several months ago, which was that the th1520 was slower in practice due to having half the LLC size; that theory is also testable since jh7110 uses the sifive cache which has a configurable way disable
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<conchuod>
smaeul: you might be interested in "riscv: cache: implementation dcache for cv1800b" on the uboot ml
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<drewfustini>
" first to incorporate the RISC-V K1 chip, developed by SpacemiT Technologies Ltd., designed in accordance with the RISC-V Foundation RVA22 standards."
<drewfustini>
"K1 chip features an 8-core 64-bit processor with advanced Vector in 1.0 technology, offering 2.0 TOPs of AI computing power."
<xypron>
drewfustini: Let's hope that they care about upstreaming.
<xypron>
Then it will be a great board.
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<drewfustini>
Yeah, I hope so too
<xypron>
Concerning Pioneerbox vs Unmatched: My experience with building Ubuntu'g glibc was 7 h on Pioneer box vs 3.5 days on Unmatched.
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<davidlt>
drewfustini, I would take JH7110 against TH1520
<drewfustini>
Other than IO like PCIe, what do you think benefits the JH7110 performance?
<Tenkawa>
drewfustini: I have been astonished at how good my BPI Amlogic CM board is so if they put any decent effort into this RV one I'll be buying one/more
<drewfustini>
I'm very interested in the SoC vendor. I had never heard of them before
<Tenkawa>
Ah. yeah they are fairly well known nowadays in the ARM world
<mps>
IIUC discussion for last day, milk-v pioneer is not good choice for distro builder?
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<xypron>
mps: The Pioneer box is the fastest thing you can get now. But with RVA22 pushing to market using a VM on x86 or arm64 may be more future proof.
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<davidlt>
drewfustini, vendor working on software support upstream, PCIe M2 is a must, and it performs really well against TH1520 (sometimes winning).
<davidlt>
Also I just don't trust T-HEAD 1st gen IP.
<sorear>
the pioneer box is the fastest thing you can buy, but it's far slower than you'd expect for 64 low-end OoO cores
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<mps>
xypron: aha ok and thanks.
<davidlt>
Oh yeah, you are not gonna get 16x performance bump compared to Unmatched.
<mps>
heh, and I expected it is a lot faster
<Tenkawa>
I'm quite happy with cross compiling on my Parallels VM
<mps>
Tenkawa: I'm workig on x86_64 host with qemu-user, not so fast but quite ok
<Tenkawa>
It runs builds for me right now quite well..
<sorear>
apart from the poorly understood store buffer issue, the memory bandwidth per MIPS is much lower than you'd get on high core count x86
<mps>
and interesting thing it is not much faster on apple silicon M1pro machine
<Tenkawa>
mps: yeah this Mac is almost native since ARM and RV are so close
<Tenkawa>
mps: with Parallels it would be on the order of 100x faster or more than qemu
<mps>
to my eyes riscv looks closer to mips64
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<Tenkawa>
qemu is molasses on here in comparison
<mps>
Tenkawa: I don't know is it possible to run parallels on linux
<Tenkawa>
I run os x natively and Linux inside
<sorear>
imo: extremely wide cores like firestorm disproportionately benefit emulators and type-safe JITs, because all the extra checks you need for correctness have no dependencies and can be slotted into the schedule anywhere
<mps>
and qemu on macos have nearly bare metal performance
<mps>
but I don't use macos often, it doesn't fit to my 'fingers'
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<rbmarliere>
which tree has eth support for th1520?
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