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Diffstat (limited to 'arch/alpha/Kconfig')
| -rw-r--r-- | arch/alpha/Kconfig | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index a67b971c830a..f9e84da49716 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -586,6 +586,30 @@ config NUMA Access). This option is for configuring high-end multiprocessor server machines. If in doubt, say N. +config ALPHA_WTINT + bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC + default y if ALPHA_QEMU + default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA) + default n if !ALPHA_SRM && !ALPHA_GENERIC + default y if SMP + ---help--- + 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. + config NODES_SHIFT int default "7" |