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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.