At the end of last year, work was being done on kernel patches for Linux that would make it possible to boot x86_64 systems faster. This can be achieved by enabling the secondary CPU cores in parallel. There has been no progress for a while due to a code issue common to older AMD CPUs.

These issues were already reported for Zen processors and older at the time. It now appears that Zen+, Zen and previous generations are affected, and Zen 2 and 3 are unaffected. Because the boot process crashes and crashes early, there is very little output, making it very difficult to debug.

Parallel boot support can save a lot of time when booting systems with a large number of processing cores. There doesn’t seem to be much priority in fixing the bug. It is not yet known when the patches will be made available and which processors will be supported.

Sources: Phoronix(1), (2)

Source: Hardware Info

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