https://nalar.dev/tags/msi-x/ Recent content in MSI-X on Nalar Hugo en-us Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/msi-x-lets-device-queues-target-separate-cpu-interrupt-paths/ Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/msi-x-lets-device-queues-target-separate-cpu-interrupt-paths/ <h1 id="msi-x-lets-device-queues-target-separate-cpu-interrupt-paths">MSI-X Lets Device Queues Target Separate CPU Interrupt Paths</h1> <p>A multiqueue PCIe device can move data through many queues at once, yet a single interrupt path would funnel completion handling back through one signal. MSI-X removes that device-wide bottleneck from the interrupt interface. Each allocated MSI-X entry represents an independently configurable message-signaled interrupt, so a driver can associate different queues or event classes with different Linux IRQs and CPU affinity policies.</p> https://nalar.dev/msix-per-vector-masking-separates-interrupt-control-across-device-queues/ Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/msix-per-vector-masking-separates-interrupt-control-across-device-queues/ <h1 id="msi-x-per-vector-masking-separates-interrupt-control-across-device-queues">MSI-X Per-Vector Masking Separates Interrupt Control Across Device Queues</h1> <p>A PCI function using MSI-X can expose multiple interrupt vectors whose delivery state is controlled independently. Software can mask one MSI-X table entry while other enabled entries remain able to signal interrupts. That property matters for devices with multiple queues because interrupt control can follow the same partitioning as the I/O work instead of collapsing every notification source behind one device-wide interrupt state.</p>