kernel
Discussion about kernels and kernel configurations here..
linux-lowlatency
Shipped with Ubuntu Studio since 12.04 Precise. Principally a standard Ubuntu kernel (no additional patches to the code, allthough the linux-lowlatency shipped with precise includes a minor patch).
Configurations of interest
These configs need to be somewhat documented and tested
To enable the use of the rtirq script:
CONFIG_CMDLINE="threadirqs"
depends on: CONFIG_CMDLINE_BOOL=y
needed for "threadirqs": CONFIG_IRQ_FORCED_THREADING=y
TODO - do the same for the configs below:
# CONFIG_RCU_BOOST is not set # CONFIG_NTP_PPS is not set # CONFIG_RCU_CPU_STALL_DETECTOR is not set # CONFIG_RCU_CPU_STALL_VERBOSE is not set # CONFIG_PREEMPT_TRACER is not set CONFIG_TREE_PREEMPT_RCU=y CONFIG_PREEMPT_RCU=y CONFIG_PREEMPT_NOTIFIERS=y # CONFIG_PREEMPT_NONE is not set # CONFIG_PREEMPT_VOLUNTARY is not set CONFIG_PREEMPT=y CONFIG_HZ_1000=y CONFIG_HZ=1000 CONFIG_SLAB=y # CONFIG_EXPERT is not set # CONFIG_NO_HZ is not set # CONFIG_DEBUG_KERNEL is not set
linux-rt
Not in Ubuntu repo since 9.10 Karmic.