Difference between revisions of "Repo-ck"
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== How Much Faster Are the CPU Optimized Packages ==
== How Much Faster Are the CPU Optimized Packages ==
Revision as of 21:14, 18 December 2012
Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki - Main article. Template:Article summary wiki - Linux-ck Changelog. Template:Article summary wiki - Popularity of packages, # of downloads, etc. Template:Article summary end
- 1 TL; DR Summary
- 2 Details
- 3 Setup
- 4 Installation Examples
- 5 How to Determine Which CPU Optimized Package Set to Select
- 6 How Much Faster Are the CPU Optimized Packages
- 7 How to Enable the BFQ I/O Scheduler
- 8 Package Trivia/Repo Statistics
- 9 Troubleshooting
TL; DR Summary
- AUR - Kernel and headers.
- AUR - Matched nVidia modules.
- AUR - Matched nVidia legacy modules.
- AUR - Matched broadcom-wl modules.
- AUR - Matched virtualbox-host and virtualbox-guest modules.
- Generic - Any x86_64 or i686 CPU.
- Atom - Optimized packages for Intel Atom CPUs.
- Core2 - Optimized packages for Intel C2D/C2Q CPUs.
- Nehalem - Optimized packages for First Generation Intel Core i3/i5/i7 CPUs.
- Sandybridge - Optimized packages for Second Generation Intel Core i3/i5/i7 CPUs.
- Ivybridge - Optimized packages for Third Generation Intel Core i3/i5/i7 CPUs.
- P4 - Optimized packages for Intel Pentium 4 CPUs.
- Pentm - Optimized packages for Intel Pentium-M CPUs.
- Kx - Optimized packages for AMD K7/K8/K10 CPUs.
- Barcelona - Optimized packages for AMD Barcelona CPUs.
- Bulldozer - Optimized packages for AMD Bulldozer CPUs.
- Piledriver - Optimized packages for AMD Piledriver CPUs.
Setup: See the Repo-ck#Setup section below to enable and use the repo.
The repo contains generic packages as well as CPU-specific packages. 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:
- 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.
CPU SPECIFIC AND OPTIMIZED
- 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-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).
- ck-kx ==> AMD K7 (Athlon/Athlon XP)/K8 (Athlon 64, Athlon 64 X2, 23xx Quad-Core Barcelona, Sempron, Sempron 64)/K10-family (Athlon X2 7x50, Phenom X3/X4, Phenom II, Athlon II X2/X3/X4, Sempron 64 [Socket AM3 only], 61xx Eight-Core Magny-Cours) specific optimizations. Enables use of some extended instructions, and passes appropriate optimization flags to GCC.
- ck-barcelona ==> AMD Barcelona CPUs.
- ck-bulldozer ==> Optimized packages for AMD Bulldozer CPUs.
- ck-piledriver ==> Optimized packages for AMD Piledriver CPUs.
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 $CFLAGS.
[Graysky's public key] used for package signing. Pacman v4 will automatically query the public key server, but if users would rather download and manually add the key, do so from the link.
1) Add the following to
/etc/pacman.conf (I placed my entry at the bottom of the file):
[repo-ck] SigLevel = PackageRequired Server = http://repo-ck.com/$arch
To sign graysky's key, do the following:
# pacman-key -r 5EE46C4C # pacman-key --lsign-key 5EE46C4C
2) Refresh via pacman -Syy
That's it. To see the contents of the repo, just search as such:
$ pacman -Sl repo-ck
Use the ck-X group and select the desired packages for installation. There are 6 groups corresponding to the 12 package sets: ck-generic, ck-atom, ck-core2, ck-nehalem, ck-sandybridge, ck-ivybridge, ck-p4, ck-pentm, ck-kx, 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, the following links can be used to help determine which package set to select.
Users who are still unable to determine which packages set to select should 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 ck-X package sets.
|k7, k8, k10||ck-kx|
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
- Various package sets are compiled via a Bash wrapper script for makepkg. The script is publicly accessible at graysky's github repo.
- 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."