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AMD’s landmark K5 processor family will no longer be supported by Linux when kernel version 7.2 arrives. The Linux-watchers at Phoronix noticed the forced retirement of the venerable K5 in a recent patch designed to “remove support for TSC-less Pentium variants.” The lack of TSC (Time Stamp Counter) in the K5 apparently makes it a burden for developers to support in the kernel.
The K5 holds a special place in AMD history as the firm’s first independently designed x86 processor. However, it wasn’t a very popular processor as it arrived late, then offered lackluster performance in the competitive environment it joined.
AMD’s shiny homegrown 4.3M transistor chip featured a “RISC-based internal architecture that decoded x86 instructions into micro-instructions before executing them,” we noted in a 2008 retrospective. However, launch SKUs in 1996 were limited to clocks from 75 MHz to 133 MHz, and, due to being late, Intel’s Pentium line was already faster. AMD still managed to get an edge on the Cyrix 6x86, though.
You may likeAs was de rigueur at the time, these AMD K5 chips were sold with a ‘performance rating’ (PR) figure, suggesting an integer performance comparison with an Intel Pentium with the indicated clock speed. For example, a second revision K5 with a 116 MHz clock was marketed as a K5 PR166. Enthusiasts don’t like this kind of obfuscation, even when it is clearly on the surface. We also note that this era marked the introduction of the heatsink and fan as a CPU-partnering necessity.
We reported a month ago that Linux devs had started to remove support for the 37-year-old Intel i486 CPU in patches destined for the Linux 7.1 kernel. That was probably a bigger deal than today’s AMD K5 news, as many more of these processors were sold.
Other lesser-known processor lines have also been retired from Linux support, but are still worth a mention for the sake of completeness. Specifically, the AMD Elan (i486‑class, TSC‑less) SoC for embedded systems which first launched in 1995, looks set to be retired in Linux 7.2. Similarly the AMD Geode x86 embedded processors (early 2000s Elan replacements) will be cut off from Linux support from Linux kernel 7.2.
With no end in sight for the RAMpocalypse, it is a little sad to see older hardware getting dropped from support. However, machines packing these retired processors can still be used in fun projects where a fully up-to-date security-hardened internet-connected patched OS isn’t essential.
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