Category: kernel

Fedora 12 / boot / initrd / initramfs

I have been using Fedora 12 (under HVM – Oracle VM 2.2) to build latest kernels from git (kernel.org), identify bugs, bisect, build and test. On Xen HVM Fedora 12 is quite slow (a full kernel build takes 3.5 hrs). I have noticed that initrd / mkinitrd does not have a future as Fedora 12…

kernel

HP QLogic Drivers

The released drivers need some good patching for rhel5 oel5 and OracleVM.

development

Extra Data Received on Transport in Urgent Mode (MSG_OOB)

While transmitting data in Urgent Mode at the socket layer: Urgent mode is initiated using send(…, MSG_OOB), Current outgoing queue is longer than MTU Several packets are sent out with the URG flag set. The Urgent Pointer field in the TCP header is not updated correctly. Instead, it stays the same.

kernel

A Baby Named “Linux”!!

By Linux.com Staff on October 11, 2008 (2:00:00 PM) Reader Christian Nielsen wrote from Sweden to tell us he and his girlfriend have named their baby Linux, after the operating system, and attached this darling photo.

kernel

Giant Java Processes

As we see that the resident memory (RES) got for the java/jvm is 3.9 GB. As we are on an 32-bit system, that is basically pushing the limits of the address space. For this to happen the max heap for the JVM being run should have been set at least 4GB.

development

USB TV BOX

Just got a noname MODEL:USB2.OBOX (or 0BOX?) and attached to my D630 running EL5U2 (i386).. Attaching gives Jul 30 13:19:55 localhost kernel: usb 2-1: new high speed USB device using ehci_hcd and address 7Jul 30 13:19:55 localhost kernel: usb 2-1: configuration #1 chosen from 1 choice in messages and got a brand new Bus 002…

Cisco VPN Client 4.8 and Recent Linux Kernel Versions

I have been playing with this for some time .. Below are patches over Cisco VPN client 4.8 rev 490 some are compiled from around and some are my own ports (especially for 2.6.24+ ): For 2.6.18 based kernels (OEL/RHEL/CentOS 5), download and apply vpnclient-4.8-2.6.18-XceptN.patch on your vpnclient build directory. e.g.: # wget -q http://xceptn.com/patches/vpnclient/vpnclient-4.8-2.6.18-XceptN.patch…

internet

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