Alibaba has provided more details on its first RISC-V-based product; A 16-core RISC-V processor called the XT 910.
As at the time of its release in July 2019, not much was said about the XuanTie 910 except that it was targeted towards the high-performance end to end 5G, AI, and autonomous driving applications. But during the virtual Hot Chips 2020 conference held recently, Alibaba gave more insight on the overview of the processor, how it stacks up to Arm’s Cortex-A73, and a glimpse of what they plan for down the road.
Alibaba claims the XT910 (XT stands for Xuantie, which is a heavy sword made using dark iron), is the most powerful RISC-V processor to date. The performance of the XT910 was compared to Cortex-A73 (Kirin 970) with the same L1 cache capacity, and the results showed that Alibaba chip outdistanced the Cortex-A73 in a number of the benchmark parameters. We are however not sure if the benchmarks included the RISC-V Turbo extension.
Some features and specifications of the XT910 processor include:
- 16x 64-bit RISC-V (RV64GCV) cores with a peak clock speed of 2.0GHz and 2.5GHz etched in 12 nm processes which include 16-bit instructions.
- Supports RISC-V 0.7.1 Vector extension and custom Turbo extension
- Up to Four clusters of four cores
- 32KB or 64KB instruction/data cache per core and up to 8MB L2 cache per cluster
- Vector Computing Unit for AI acceleration
- Sv39 MMU + 8/16 PMP
- Clint + PLIC interrupt controller, and,
- Support for unaligned memory data access
Yu Pu, edge product lead for T-Head semiconductor, the Alibaba organization that designed the chips said Alibaba is looking to make RISC-V the basis for its cloud and edge computing infrastructure. He admitted that the RISC-V is not “mature enough” in terms of technology and ecosystem”, but they are confident it holds a lot of potentials and wants to work with the open-source community to improve it.