Category: linux

Reading for Linux Kernel internals

It is really nice to read “Understanding the Linux Kernel” by Bovet & Cesati (O’Reilly).. Strongly advised..

development

The vm.swappiness Parameter in Linux 2.6 Kernels

The vm.swappiness parameter for Linux 2.6 kernels is based on a scalefrom 0 to 100. The default is 60 and it is known to serve Oracle RDBMSrelated workloads statistically the best. The swappiness definedby this parameter, is for a raw and general priority paging. This isabout prioritizing the page-out of pages from anonymous vs. file-backedmemory….

kernel

Building Binaries from Sources

If there is the configure script: ./configure make && sudo make install If there is autogen.sh: ./autogen.sh make && sudo make install

development

Adding Java plugin to Firefox

Add a link ln -s /usr/java/jre1.5.0_11/plugin/i386/ns7/libjavaplugin_oji.so libjavaplugin_oji.so

desktop

How to do find and execute .. An example

to find files that has “TeXt” in them: find . -exec grep “TeXt” ‘{}’ \; -print

linux

Where is the application menu files on EL

/usr/share/applications

desktop

backup the mbr

dd if=/dev/sdX of=/tmp/sda-mbr.bin bs=512 count=1

linux

Building kernel source tree from *.src.rpm

kernel-source package provides patch applied source code: rpm2cpio kernel-source-2.4.21-27.0.2.1.7.EL.i386.rpm | cpio -idmv The src rpm does provide the base source and patches:rpm -i kernel-2.4.21-27.0.2.1.7.EL.src.rpm />> This installs the base kernel and the *.patch separatelycd /usr/src/redhat/SPECS/rpmbuild -bp kernel-2.4.ora-27.1.7.EL.spec If Architecture is not included: i386rpmbuild -bp –target i686 kernel-2.4.ora-27.1.7.EL.spec />> This installs the patches and provides the…

kernel

Unconditional Shutdown on PC HW

Uhm .. My home PC screwed up .. It kept shutting down even starting Debian in addition to Windows XP. That had happened before due to a dangling CPU fan before, and I had replaced the fan with a state of the art double 2000+ RPM one .. But no problem with that now …..

desktop