The ~200 Line Linux Kernel Patch That Does Wonders

[pinguy]

What does it do?

Explain how his patch works Mike wrote:

Quote:Each task’s signal struct contains an inherited pointer to a refcounted autogroup struct containing a task group pointer, the default for all tasks pointing to the init_task_group. When a task calls __proc_set_tty(), the process wide reference to the default group is dropped, a new task group is created, and the process is moved into the new task group. Children thereafter inherit this task group, and increase it’s refcount. On exit, a reference to the current task group is dropped when the last reference to each signal struct is dropped. The task group is destroyed when the last signal struct referencing it is freed. At runqueue selection time, If a task has no cgroup assignment, it’s current autogroup is used.

Phoronix has a put two videos showing the desktop running the latest Kernel git snapshot, glxgears, a web browser, a HD video clip and compiling a kernel with 64 jobs







[More Info at Phoronix.com]

[y2b]

Yeah, saw that yesterday. It's great. I really want Ubuntu to be using 2.6.38 in 11.04. Lets just hope someone gets started on a ppa for this kernel patch for 10.10

[pinguy]

Lennart Poettering, a RedHat developer replied to Linus Torvalds on a maling list with an alternative to this patch that does the same thing.

To use Lennart's solution in Pinguy OS, you have to add the following commands in your /etc/init.d/rc.local (open it with: gksu gedit /etc/init.d/rc.local) file, add this to the bottom of the file:

Code: [Select All]

mkdir -p /dev/cgroup/cpu
mount -t cgroup cgroup /dev/cgroup/cpu -o cpu
mkdir -m 0777 /dev/cgroup/cpu/user
echo "/usr/local/sbin/cgroup_clean" > /dev/cgroup/cpu/release_agent
sudo bash -c "echo '
#!/bin/sh
if [ "$*" != "/user" ]; then
rmdir /dev/cgroup/cpu/$*
fi' > /usr/local/sbin/cgroup_clean

Then save and close.

And then add the following to your ~/.bashrc file (to open it: gedit ~/.bashrc):

Code: [Select All]

if [ "$PS1" ] ; then
mkdir -p -m 0700 /dev/cgroup/cpu/user/$$ > /dev/null 2>&1
echo $$ > /dev/cgroup/cpu/user/$$/tasks
echo "1" > /dev/cgroup/cpu/user/$$/notify_on_release
fi

Run the following command:

Code: [Select All]

sudo gedit /usr/local/sbin/cgroup_clean

And paste this:

Code: [Select All]

#!/bin/sh
if [ "$1" != "/user" ]; then
rmdir /dev/cgroup/cpu/$1
fi

then save the file and make it executable:

Code: [Select All]

sudo chmod +x /usr/local/sbin/cgroup_clean

And finally,

Code: [Select All]

sudo apt-get install cgroup-bin libcgroup1

then restart the computer.

You can also try install the bfs kernel instead. Its meant to be faster but the kernel is still at a beta stage.

32-Bit
http://www.multiupload.com/A50C2RQXNA
http://www.multiupload.com/2WR0LGQAP0

64-Bit
http://www.multiupload.com/LGXOVBD9K4
http://www.multiupload.com/JCOWBLRPPT

Here's a quick video demonstrating how fast programs like OOo open when the BFS Kernel 2.6.36 is installed.





[via Webupd8]

[Jeff91]

Just applied this to my netbook... Not noticing anything major right out of the gate. Will report back in a week or so if I notice an improvement.

~Jeff

[y2b]

Thanks for putting the 32-bit version. Appreciate it.

[E-man]

Works great in my -06 HP Pavilion desktop. Applications are a lot faster now, Firefox, OO etc, and the system starts up quicker too. That's really good news, because PinguyOS isn't very fast really. Very nice it is though.

Thanks!

[Jeff91]

Just so we are clear - you need to apply the patch you list AND install the kernel for the speed increase? Was just confused because Webup8 lists the patch you describe as an alternative to the patched kernel, which I thought meant it is not needed.

~Jeff