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--- linux:kernel [2006/11/02 12:22]
a usage of kernellab
+++ linux:kernel [2009/05/25 00:35] (current)
@@ Line 1: / Line 1: @@
 ====== Linux kernel ======
+===== Compiling the debian way =====
+**see:** [[http://kernel-handbook.alioth.debian.org/|Debian Linux Kernel Handbook]]
+   bzip2 -dc /usr/src/patch.bz2 | patch -p1 --dry-run
+   make-kpkg clean
+   fakeroot make-kpkg --initrd --append-to-version=-custom kernel_image kernel_headers
+After **''--append-to-version=''** you can write any string that helps you identify the kernel, but it must begin with a minus (-) and must not contain whitespace.
+** SMP/DualCore compiling tip **
+   # CONCURRENCY_LEVEL=4 make-kpkg --initrd --rootcmd=fakeroot --append-to-version=<version> kernel_image
+==== Cross-compiling ====
+see: http://michael-prokop.at/blog/2007/01/21/cross-compile-the-linux-kernel-on-debian/
+Adjust $KERNELSOURCE/Makefile to:
+   ARCH            = powerpc
+   CROSS_COMPILE   = powerpc-linux-gnu-
+   export ARCH=powerpc
+   make-kpkg --arch powerpc ...
@@ Line 15: / Line 50: @@
    for a in router1 router2 router3 ...; do kernellab "$a"; done
+=====  IO scheduler =====
+    *  Completely Fair Queuing—elevator=cfq
+    * Deadline—elevator=deadline
+    * NOOP—elevator=noop
+    * Anticipatory—elevator=as
+   image = /boot/vmlinuz26113
+   initrd = /boot/initrd.gz
+   append = "elevator=deadline"
+   root = /dev/hda1
+   label = kernel_2.6.11.3
+   read-only
+   # cat /sys/block/hda/queue/scheduler
+   noop [anticipatory] deadline cfq
+how come deadline is not being chosen??
+This works.
+   # echo deadline > /sys/block/hda/queue/scheduler
+   # cat /sys/block/hda/queue/scheduler
+   noop anticipatory [deadline] cfq