Comments on: Tuning the Linux Kernel’s Completely Fair Scheduler http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/ For Those Who Like to Dig Deeper Thu, 02 Sep 2010 19:42:32 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Bill Anderson http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1502 Bill Anderson Thu, 02 Sep 2010 19:42:32 +0000 http://www.hotaboutlinux.com/?p=30#comment-1502 You can find the instructions in the Documentation/scheduler/sched-design-CFS.txt file in the Linux source tree. You can find the instructions in the Documentation/scheduler/sched-design-CFS.txt file in the Linux source tree.

]]> By: Bill Anderson http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1501 Bill Anderson Thu, 02 Sep 2010 19:32:18 +0000 http://www.hotaboutlinux.com/?p=30#comment-1501 I checked the source for 2.6.32-24 and that CONFIG_KERNEL_DEBUG is now CONFIG_DEBUG_KERNEL and CONFIG_SCHED_DEBUG still does exist. Name changes between version is not uncommon. It makes working with the kernel more exciting. I checked the source for 2.6.32-24 and that CONFIG_KERNEL_DEBUG is now CONFIG_DEBUG_KERNEL and CONFIG_SCHED_DEBUG still does exist. Name changes between version is not uncommon. It makes working with the kernel more exciting.

]]> By: anonyomus http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1500 anonyomus Wed, 18 Aug 2010 13:34:56 +0000 http://www.hotaboutlinux.com/?p=30#comment-1500 Does anyone know how to create the directory /dev/cpuctl and set a certain process to be scheduled in such a way. My interest is decreasing the performance of the kvm processe on my notebook that runs the Windows XP guest. It eats far too much CPU especially when it is used only Lotus Notes. Does anyone know how to create the directory /dev/cpuctl and set a certain process to be scheduled in such a way. My interest is decreasing the performance of the kvm processe on my notebook that runs the Windows XP guest. It eats far too much CPU especially when it is used only Lotus Notes.

]]> By: anonyomus http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1499 anonyomus Wed, 18 Aug 2010 13:28:04 +0000 http://www.hotaboutlinux.com/?p=30#comment-1499 but the second portion of your post does work for Ubuntu 10.04 /boot/config-2.6.32-22-generic: # fgrep CONFIG_PREEMPT /boot/config-$(uname -r) CONFIG_PREEMPT_NOTIFIERS=y # CONFIG_PREEMPT_NONE is not set CONFIG_PREEMPT_VOLUNTARY=y # CONFIG_PREEMPT is not set but the second portion of your post does work for Ubuntu 10.04 /boot/config-2.6.32-22-generic:
# fgrep CONFIG_PREEMPT /boot/config-$(uname -r)
CONFIG_PREEMPT_NOTIFIERS=y
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set

]]> By: anonyomus http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1498 anonyomus Wed, 18 Aug 2010 13:26:26 +0000 http://www.hotaboutlinux.com/?p=30#comment-1498 fgrep CONFIG_KERNEL_DEBUG /boot/config-$(uname -r) Works in Ubuntu but won't return anything because the string is unusued. fgrep CONFIG_SCHED_DEBUG /boot/config_$(uname -r) Certainly won't work in Ubuntu fgrep CONFIG_KERNEL_DEBUG /boot/config-$(uname -r)
Works in Ubuntu but won’t return anything because the string is unusued.
fgrep CONFIG_SCHED_DEBUG /boot/config_$(uname -r)
Certainly won’t work in Ubuntu

]]> By: Bill Anderson http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1486 Bill Anderson Mon, 22 Mar 2010 11:11:14 +0000 http://www.hotaboutlinux.com/?p=30#comment-1486 You are correct. For those interested, the package is libcgroup1. I will provide more details on this package in a separate article. You are correct. For those interested, the package is libcgroup1. I will provide more details on this package in a separate article.

]]> By: Rafael Tinoco http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1484 Rafael Tinoco Tue, 16 Mar 2010 16:44:12 +0000 http://www.hotaboutlinux.com/?p=30#comment-1484 Instead of having one script to create cgroups and all. Try searching of libcg ;) (/etc/cgconfig.conf). Regards Inaddy Instead of having one script to create cgroups and all. Try searching of libcg ;) (/etc/cgconfig.conf).

Regards

Inaddy

]]> By: admin http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1435 admin Wed, 20 Jan 2010 17:35:02 +0000 http://www.hotaboutlinux.com/?p=30#comment-1435 It should read "CONFIG_RT_GROUP_SCHED applies group scheduling to the SCHED_FIFO and SCHED_RR policies." One of the features of CFS is that it separates scheduling policies. While they are not kernel configuration options, the separation of scheduling policies makes the code more modular, and easier to change. The CONFIG_RT_GROUP_SCHED option allows one to configure real-time processes to use group scheduling. Real-time processes are not something you see in most server or desktop systems. In fact, the only real-time process on most system is the kernel's migration thread. Real-time process have a higher priority than normal, or batch processes. Real-time processes either run as FIFO, or Round-Robin. It should read “CONFIG_RT_GROUP_SCHED applies group scheduling to the SCHED_FIFO and SCHED_RR policies.” One of the features of CFS is that it separates scheduling policies. While they are not kernel configuration options, the separation of scheduling policies makes the code more modular, and easier to change. The CONFIG_RT_GROUP_SCHED option allows one to configure real-time processes to use group scheduling. Real-time processes are not something you see in most server or desktop systems. In fact, the only real-time process on most system is the kernel’s migration thread. Real-time process have a higher priority than normal, or batch processes. Real-time processes either run as FIFO, or Round-Robin.

]]> By: chruck http://www.hotaboutlinux.com/2010/01/tuning-the-linux-kernels-completely-fair-scheduler/comment-page-1/#comment-1434 chruck Wed, 20 Jan 2010 17:12:01 +0000 http://www.hotaboutlinux.com/?p=30#comment-1434 I don't understand the description of CONFIG_RT_GROUP_SCHED. I don’t understand the description of CONFIG_RT_GROUP_SCHED.

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