Solving Microsecond CPU Stalls: Could CXL Stall-Hiding Shape Future Chips?
lauriewired · x · 2026-08-06
The author delves into the complexities of CPU scheduling for minuscule tasks. When a CPU experiences a memory stall of just 1 microsecond, it loses roughly 5,000 cycles, yet it is extremely difficult for the system to intervene at an arbitrary stalled instruction and decide what to execute next.
Addressing this issue of the "minimum profitable scheduling quantum," the author speculates that future Intel Xeon chips might eventually implement some form of CXL-based stall hiding to mitigate these memory delays.
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