CONFIG_ALPHA_WTINT: Use WTINT

General informations

The Linux kernel configuration item CONFIG_ALPHA_WTINT:

• prompt: Use WTINT
• type: bool
• depends on: ( CONFIG_ALPHA_SRM || CONFIG_ALPHA_GENERIC ) && ( CONFIG_ALPHA_QEMU ) && ( CONFIG_ALPHA_EV5 || CONFIG_ALPHA_EV56 || ( CONFIG_ALPHA_EV4 && ! CONFIG_ALPHA_LCA )) && (! CONFIG_ALPHA_SRM && ! CONFIG_ALPHA_GENERIC ) && ( CONFIG_SMP )
• defined in arch/alpha/Kconfig
• found in Linux kernels: 3.13–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

The Wait for Interrupt (WTINT) PALcall attempts to place the CPU to sleep until the next interrupt. This may reduce the power consumed, and the heat produced by the computer. However, it has the side effect of making the cycle counter unreliable as a timing device across the sleep.

For emulation under QEMU, definitely say Y here, as we have other mechanisms for measuring time than the cycle counter.

For EV4 (but not LCA), EV5 and EV56 systems, or for systems running MILO, sleep mode is not supported so you might as well say N here.

For SMP systems we cannot use the cycle counter for timing anyway, so you might as well say Y here.

If unsure, say N.

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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