kernel
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← Revision 15 as of 2012-07-23 10:58:24 ⇥
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| Deletions are marked like this. | Additions are marked like this. |
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| == linux-lowlatency == | = linux-lowlatency = |
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| === Configurations of interest for linux-lowlatency === | == Configurations of interest for linux-lowlatency == |
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| '''May reduce latency''' * '''[[ http://cateee.net/lkddb/web-lkddb/PREEMPT_RCU.html | CONFIG_PREEMPT_RCU ]]''' {{{ CONFIG_PREEMPT_RCU=y }}} ''additional, related configs'' * '''[[http://cateee.net/lkddb/web-lkddb/TREE_PREEMPT_RCU.html | CONFIG_TREE_PREEMPT_RCU]]''' * '''[[http://cateee.net/lkddb/web-lkddb/RCU_BOOST.html | CONFIG_RCU_BOOST]]''' * '''[[http://cateee.net/lkddb/web-lkddb/RCU_CPU_STALL_DETECTOR.html | CONFIG_RCU_CPU_STALL_DETECTOR]]''' * '''[[http://cateee.net/lkddb/web-lkddb/RCU_CPU_STALL_VERBOSE.html | CONFIG_RCU_CPU_STALL_VERBOSE]]''' as configure in current -lowlatency.. {{{ CONFIG_TREE_PREEMPT_RCU=y # CONFIG_RCU_BOOST is not set # CONFIG_RCU_CPU_STALL_DETECTOR is not set # CONFIG_RCU_CPU_STALL_VERBOSE is not set }}} |
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| ==== High resolution timer: ==== | === High resolution timer: === |
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| * '''[[http://cateee.net/lkddb/web-lkddb/HZ.html | CONFIG_HZ=1000 ]]''' | * '''[[http://cateee.net/lkddb/web-lkddb/HZ.html | CONFIG_HZ]]''' |
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| to enable high resolution timer | |
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| ---- | (optionally, tickless timer - add the config here) |
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| '''TODO''' - do the same for the configs below: | === Need to be investigated === |
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| {{{{ # CONFIG_RCU_BOOST is not set |
* '''[[http://cateee.net/lkddb/web-lkddb/NTP_PPS.html | CONFIG_NTP_PPS]]''' * '''[[http://cateee.net/lkddb/web-lkddb/SLAB.html | CONFIG_SLAB]]''' * '''[[http://cateee.net/lkddb/web-lkddb/PREEMPT_NOTIFIERS.html | CONFIG_PREEMPT_NOTIFIERS]]''' * '''[[[ http://cateee.net/lkddb/web-lkddb/EXPERT.html | CONFIG_EXPERT]]''' * '''[[http://cateee.net/lkddb/web-lkddb/PREEMPT_TRACER.html | CONFIG_PREEMPT_TRACER]]''' * '''[[http://cateee.net/lkddb/web-lkddb/DEBUG_KERNEL.html | CONFIG_DEBUG_KERNEL]]''' as used in current -lowlatency {{{ |
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| # CONFIG_RCU_CPU_STALL_DETECTOR is not set # CONFIG_RCU_CPU_STALL_VERBOSE is not set |
CONFIG_SLAB=y CONFIG_PREEMPT_NOTIFIERS=y # CONFIG_EXPERT is not set |
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| CONFIG_TREE_PREEMPT_RCU=y CONFIG_PREEMPT_RCU=y CONFIG_PREEMPT_NOTIFIERS=y CONFIG_SLAB=y # CONFIG_EXPERT is not set |
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| }}}} | }}} == Additional configs == * [[http://cateee.net/lkddb/web-lkddb/RT_GROUP_SCHED.html | CONFIG_RT_GROUP_SCHED]] |
../UbuntuStudio/audio-settings
Discussion about kernels and kernel configurations here..
Kernel Testing
Building your own kernel
A short description of how to build a kernel for testing.
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 for linux-lowlatency
These configs need to be somewhat documented and tested
To enable low latency (needs to be expanded)
conflicts with: CONFIG_PREEMPT_NONE
conflicts with: CONFIG_PREEMPT_VOLUNTARY
To enable this option edit the config file to have these line read:
CONFIG_PREEMPT=y # CONFIG_PREEMPT_NONE # CONFIG_PREEMPT_VOLUNTARY
May reduce latency
CONFIG_PREEMPT_RCU=y
additional, related configs
as configure in current -lowlatency..
CONFIG_TREE_PREEMPT_RCU=y # CONFIG_RCU_BOOST is not set # CONFIG_RCU_CPU_STALL_DETECTOR is not set # CONFIG_RCU_CPU_STALL_VERBOSE is not set
To enable the use of the rtirq script to change rtprio for devices:
this enables the use of threadirqs as a kernel boot parameter
optionally, to make threadirqs a default boot parameter
depends on: CONFIG_CMDLINE_BOOL
To enable these options edit the config file to have these line read:
IRQ_FORCED_THREADING=y CONFIG_CMDLINE="threadirqs" CONFIG_CMDLINE_BOOL=y
High resolution timer:
(Not exactly sure which of CONFIG_HZ=1000 and CONFIG_HZ_1000=y depend on which. )
depends on: CONFIG_NO_HZ
to enable high resolution timer
CONFIG_HZ_1000=y CONFIG_HZ=1000 # CONFIG_NO_HZ is not set
(optionally, tickless timer - add the config here)
Need to be investigated
as used in current -lowlatency
# CONFIG_NTP_PPS is not set CONFIG_SLAB=y CONFIG_PREEMPT_NOTIFIERS=y # CONFIG_EXPERT is not set # CONFIG_PREEMPT_TRACER is not set # CONFIG_DEBUG_KERNEL is not set
Additional configs
linux-rt
Not in Ubuntu repo since 9.10 Karmic.
UbuntuStudio/audio-settings/kernel (last edited 2012-07-23 10:58:24 by 90-230-166-102-no35)