Difference between revisions of "Repo-ck"
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== Setup ==
== Setup ==
[repo-ck ]'s key -key#.
== Installation Examples ==
== Installation Examples ==
Revision as of 11:37, 6 February 2014
Article details setup and usage of an unofficial Arch Linux repo containing generic and CPU-optimized kernel and support packages containing the ck1 patchset featuring the Brain Fuck Scheduler by Con Kolivas.
- 1 Packages in repo-ck
- 2 Setup
- 3 Installation Examples
- 4 How to Determine Which CPU Optimized Package Set to Select
- 5 How Much Faster Are the CPU Optimized Packages
- 6 How to Enable the BFQ I/O Scheduler
- 7 Package Trivia/Repo Statistics
- 8 Troubleshooting
Packages in repo-ck
The repo contains generic packages as well as CPU-specific packages for the linux-ck family. Many Arch users are familiar with the concept of a generic kernel package. The official Arch kernel is available in two flavors (either i686 or x86_64) which are generic packages in that i686 will work with any compatible x86 CPU and x86_64 will work with any compatible x86_64 CPU. Users have a choice between the corresponding generic linux-ck packages or CPU-specific and optimized linux-ck packages:
|CPU Type||Group Alias||Details|
|Generic||ck-generic||Compiled with generic optimizations suitable for any compatible CPU just like the official Arch linux package. This is true for both Intel and AMD processors.|
|Intel||ck-atom||Intel Atom platform specific optimizations. Intel Atom CPUs have an in-order pipelining architecture and thus can benefit from accordingly optimized code.|
|ck-core2||Intel Core 2-family including Dual and Quads (Core 2/Newer Xeon/Mobile Celeron based on Core2).|
|ck-nehalem||Intel 1st Generation Core i3/i5/i7-family specific optimizations.|
|ck-sandybridge||Intel 2nd Generation Core i3/i5/i7-family specific optimizations.|
|ck-ivybridge||Intel 3rd Generation Core i3/i5/i7-family specific optimizations.|
|ck-haswell||Intel 4th Generation Core i3/i5/i7-family specific optimizations.|
|ck-p4||Intel Pentium-4 specific optimizations (P4/P4-based Celeron/Pentium-4 M/Older Xeon).|
|ck-pentm||Intel Pentium-M specific optimizations (Pentium-M notebook chips/not Pentium-4 M).|
|AMD||ck-kx||AMD K7/K8-family specific optimizations.|
|ck-k10||AMD K10-family specific optimizations including: 61xx Eight-Core Magny-Cours, Athlon X2 7x50, Phenom X3/X4/II, Athlon II X2/X3/X4, or Turion II-family processor.|
|ck-barcelona||CPUs based on AMD Family 10h cores with x86-64 instruction set support.|
|ck-bobcat||CPUs based on AMD Family 14h cores with x86-64 instruction set support.|
|ck-bulldozer||CPUs based on AMD Family 15h cores with x86-64 instruction set support.|
|ck-piledriver||CPUs based on AMD Family 15h cores with x86-64 instruction set support.|
CPU-specific optimization are invoked at compilation by selecting the corresponding option under Processor type and features>Processor family or by setting-up the .config file accordingly. These changes setup make specific gcc options including the $CFLAGS.
Repo-ck also contains packages forAUR for each arch.
|Generic||chromium-scroll-pixels||Current stable version of chromium browser patched to maintain the --scroll-pixel functionality allowing users to set the speed of their wheel mouse's scrolling functions.|
Use the ck-X group and select the desired packages for installation. There are 6 groups corresponding to the 13 package sets: ck-generic, ck-atom, ck-core2, ck-nehalem, ck-sandybridge, ck-ivybridge, ck-haswell, ck-p4, ck-pentm, ck-kx, ck-k10, ck-barcelona, ck-bulldozer, ck-piledriver
# pacman -S ck-generic :: There are 7 members in group ck-generic: :: Repository repo-ck 1) broadcom-wl-ck 2) linux-ck 3) linux-ck-headers 4) nvidia-304xx-ck 5) nvidia-ck 6) virtualbox-ck-guest-modules 7) virtualbox-ck-host-modules Enter a selection (default=all):
Alternatively, simply direct pacman to install the packages directly:
# pacman -S linux-ck linux-ck-headers
How to Determine Which CPU Optimized Package Set to Select
Users unsure which package set to use can always install the ck-generic group which will drive any compatible CPU. For those wanting CPU-specific optimized packages, run the following command (assuming that base-devel is installed):
# gcc -c -Q -march=native --help=target | grep march
The resulting value is what gcc would use as the march CFLAG. Refer to the table below for a mapping of this value to the correct group.
|AMD||ck-kx||athlon, athlon-4, athlon-tbird, athlon-mp, athlon-xp, k8-sse3|
Additional links can be used to help determine which package set to select:
How Much Faster Are the CPU Optimized Packages
The answer is not that much faster. Extensive testing comparing the effect of gcc compile options on resulting binaries have been conducted by others with varying result from no change to rather significant speed ups.
Readers are encouraged to add to this list.
How to Enable the BFQ I/O Scheduler
Since release 3.0.4-2, the BFQ patchset is applied to the package by default. Users must enable the BFQ scheduler to use it; it is dormant by default.
Globally (for all devices)
elevator=bfq to boot loader Kernel parameters.
Selectively (for only specified devices)
Direct the kernel to use it on a device-by-device basis. For example, to enable it for
# echo bfq > /sys/block/sda/queue/scheduler
To confirm, simply cat the same file:
# cat /sys/block/sda/queue/scheduler noop deadline cfq [bfq]
Setting this way will not survive a reboot. To make the change automatically at the next system boot, create the following tmpfile where "X" is the letter for the SSD device.
w /sys/block/sdX/queue/scheduler - - - - noop
Package Trivia/Repo Statistics
- Repo statistics are available (popularity of packages, which CPU is most popular, # of downloads, etc.).
Please use this discussion thread to voice comments, questions, suggestions, requests, etc. Note from graysky, "I can add other CPU-specific builds upon request. I just wanna be sure people will actually use them if I take the time to compile them."