Partial SMT Enablement Support Lands For Linux 6.6
![LINUX KERNEL](/assets/categories/linuxkernel.webp)
This partial SMT enablement run-time control support via sysfs has been led by IBM. IBM POWER processors can allow up to 16-way SMT although 4 and 8 threads per core is more common on that front. At boot-time the Linux kernel can already control how many threads per core to bring-up but for those manipulating the SMT configuration at run-time the sysfs interface is extended to allow for only partial SMT enablement.
Linux 6.6 allows writing an integer to /sys/devices/system/cpu/smt/control for controlling the number of SMT threads per core to enable rather than simply toggling it on/off.
More details on this partial SMT enablement run-time control for Linux 6.6 via the smp/core pull.
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