- Current version: 3.4.1-1
- Kernel version: '3.4.1
Linux-pf is a kernel package based on the stock -ARCH kernel, patched with a row of significant patches:
- The latest Con Kolivas' -ck patchset, including BFS
- BFQ (as default I/O scheduler)
The reference PKGBUILD can be found at the AUR linux-pf page and at the bitbucket.org mercurial repository. Precompiled packages, generic and CPU-family optimized are uploaded at the pfkernel unofficial repository, usually within 6 hours of the AUR update for x86_64 and 2 days for i686. Append the following to
/etc/pacman.conf to activate the pfkernel repo:
[pfkernel] # Generic and optimized binaries of the ARCH kernel patched with BFS, TuxOnIce, BFQ, IMQ, Aufs3 # linux-pf, kernel26-pf, gdm-old, nvidia-pf, nvidia-96xx, xchat-greek, arora-git Server = http://dl.dropbox.com/u/11734958/$arch
Running pacman -Syyl pfkernel will update all repos and show the available packages from pfkernel. Afterwards, installing linux-pf is as trivial as running pacman -S linux-pf linux-pf-headers, but additional configuration steps must be performed; see the Installation section below.
There's a number of options a user is asked to choose from, should he/she select to compile from the PKGBUILD:
==> Hit <Y> to use your running kernel's config (needs IKCONFIG and IKCONFIG_PROC) ==> Hit <L> to run 'make localmodconfig' ==> Hit <N> (or just <ENTER>) to build an all-inclusive kernel like stock -ARCH (warning: it can take a looong time)
The <Y> option is for users who have already compiled and are running a custom kernel. The PKGBUILD reads the running kernel's configuration and uses it for the subsequent compilation. The <L> option tries some kind of autodetection of the user's hardware: it first tries to use the modprobed_db module database, then falls back to the linux kernel's make localmodconfig functionality. The last option is self-explanatory.
==> Kernel configuration options before build: <M> make menuconfig (console menu) <N> make nconfig (newer alternative to menuconfig) <G> make gconfig (needs gtk) <X> make xconfig (needs qt) <O> make oldconfig <ENTER> to skip configuration and start compiling
Choose one of these to use your favourite user interface for configuring the kernel. Note that the last option might still prompt with unresolved/new configuration options, if you have selected <Y> or <L> in the previous step.
==> An non-generic CPU was selected for this kernel. ==> Hit <G> : to create a generic package named linux-pf ==> Hit <ENTER> : to create a package named after the selected CPU (e.g. linux-pf-core2 - recommended) ==> This option affects ONLY the package name. Whether or not the ==> kernel is optimized was determined at the previous config step.
If you have selected a specific CPU optimization for your kernel in the previous step, the default action is to append the CPU to the package name. This way, a subsequent package update from the repository will pull the optimized package and not the generic one. This also will help better compatibility with 3rd party precompiled modules (e.g. nvidia-pf), which might break things if loaded on optimized linux-pf kernels.
$ sudo pacman -U linux-pf-core2-3.3.2-1-x86_64.pkg.tar.xz linux-pf-headers-core2-3.3.2-1-x86_64.pkg.tar.xz
During the kernel installation, mkinitcpio will be called by the install script to recreate the initramfs.
/etc/mkinitcpio.confafter the installation, you must run mkinitcpio -p linux-pf to have the initial ramdisk recreated.
Then, you need to add a boot entry in
/boot/grub/grub.cfg) which points to linux-pf (the following example is from one of the maintainer's boxes):
title Linux-pf 3.2 root (hd0,4) kernel (hd0,0)/vmlinuz-linux-pf root=/dev/disk/by-label/ROOT ro vga=0x318 lapic resume=/dev/disk/by-label/SWAP video=vesafb:ywrap,mtrr:3 fastboot quiet initrd (hd0,0)/initramfs-linux-pf.img
If you intend to use TuxOnIce for hibernation, make sure you have added the necessary modules to the MODULES array of
/etc/mkinitcpio.conf and at least the resume hook to the HOOKS array:
MODULES="... lzo tuxonice_compress tuxonice_swap tuxonice_userui ..." HOOKS="... sata userui resume filesystems ..."
In the example above, TuxOnIce is setup to use a swap partition as the suspended image allocator. The resume hook must be placed before filesystems. Also, a progress indicator is requested with userui. Please read the TuxOnIce wiki page for more detailed information.
Last, you must choose whether you want to suspend using pm-utils or the hibernate-script. Please, refer to the respective wiki pages for more details. TuxOnIce offers the option for a text mode or an even nicer framebuffer splash progress indicator.
/etc/hibernate/tuxonice.confuntil it gets fixed. This workaround has been confirmed to work, adding only 1-2 seconds of delay to hibernation.
Tweaks / Tips
- If you notice disk-related performance problems or occational hickups, it might be an I/O scheduler issue. Try a different one than the linux-pf default (BFQ) by echoing to
/sys/block/sda/queue/schedulercfq, noop or deadline: echo noop >| /sys/block/sda/queue/scheduler. Note, the aforementioned command only sets the I/O scheduler for the 1st hard drive and additional echos will be needed if you have more. If the situation improves, then append "elevator=cfq" (or noop or deadline) to the linux-pf command line in
/boot/grub/menu.lst, to make the change permanent.
- For people who build their own tailored kernels and compilation aborts with with an error about "missing include/config/dvb/*.h files", setting <M> at DVB for Linux at Device Drivers/Multimedia support and leaving everything else out, creates just the necessary dvb.h, which allows the compilation to continue.
Forum thread for linux-pf
There's a discussion thread at the BBS for reporting errors, impressions, ideas and requests.