Semiconductor & Computer Engineering
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Difference between revisions of "hisilicon/hydra"
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Revision as of 19:47, 5 May 2019
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Hydra or Hydra Interface (HiLink) is a custom interface designed by HiSilicon for their Kunpeng (Hi16xx) family of ARM server processors designed to facilitate coherent symmetric multiprocessing support.
Overview
The Hydra Interface is a high-speed cache coherent interconnect architecture designed to facilitate symmetric multiprocessing between their Kunpeng processors. The Hydra interface is multiplexed over a number of extra PCIe lanes. Each Hydra interface has either x4 or 8x lanes.
When in 2-way SMP, multiple Hydra interfaces are combined.
| 2-way SMP Hydra Interface | |||
|---|---|---|---|
| Links | 10 GT/s | 12 GT/s | |
| 1 | 1x8 | 10 GB/s | 12 GB/s |
| 2 | 2x8 | 20 GB/s | 24 GB/s |
| 3 | 3x8 | 30 GB/s | 36 GB/s |
In a 4-way SMP, three Hydra interfaces are used per CPU with one link between each CPU, creating an all-to-all connection.
