Processors have become too multi-core. The default 64-bit mainline Linux Arm kernel build can't handle a pair of 192-core Ampere CPUs

by alex

But Ampere solved this with a patch

While modern x86-compatible processors, thanks to AMD, have reached the mark of 128 cores per CPU, processors based on the Arm architecture have long since crossed this mark, and this has become a problem. As it turns out, the Linux operating system is not yet ready for this.

Процессоры стали слишком многоядерными. 64-битная основная сборка ядра Linux Arm по умолчанию не справляется с парой 192-ядерных CPU Ampere

The question was raised by Ampere, which released its 192-core CPUs on Arm. The problem is that two such processors in one system means 384 cores, and today the 64-bit main Linux Arm kernel build only supports up to 256 cores. To solve this problem, Ampere itself introduced a patch that proposes to increase the Linux kernel limit to 512 cores using the “CPUMASK_OFFSTACK” method. In fact, support can be increased to 8192 cores at once, but the limit of 512 was chosen for the sake of economy, since support for each CPU core adds about 8 KB to the size of the kernel image.

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It is reported that without patches, support for more than 256 cores in Linux will not appear until next year, when Linux 6.8 is released.

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