After having some bouts with windows 8 I decided to throw it out and run Ubuntu as the main operating system.
Currently I am having some problems with performance:
Even when running the simplest tasks, such as logging in to the UI or console, or running
apt-get upgrade, it takes a very long time, and the CPU fan is spinning at full speed.
top, and the
top application itself takes about 13%.
As a comparison, if I run
top on a 2007 Macmini also running Ubuntu 13.04,
top uses about 0,5%. Cold-boot to login-prompt GUI takes minutes, compared to about 15 seconds on Windows 7 and less than a minute on the Macmini. Starting a terminal window by ctrl-alt-t takes perhaps 20 seconds, and even editing a command line has significant delays.
Question: How do I solve this performance problem?
I have installed Ubuntu 13.04 (64 bit) on an Acer Aspire 8951G on the 120 GB SSD in ext4 format, with a 32 GB swap on an HDD.
Then, coming from a Windows environment, I started by doing an update:
sudo apt-get update && apt-get upgrade. It also was very slow.
I have 32 GB RAM installed (which works in the BIOS, Windows in Ubuntu). I have the most current BIOS (1.13) I could find on the Acer support site.
If I start
partedmagic from the current
ultimate boot cd, there is the same performance problem.
If I try the
partedmagic on another Acer I have (Acer Aspire V3-571G), there is the same performance problem.
In Windows 7 that I had installed yesterday as the main operating system, there were no performance problems.
More info 2013-05-30:
I tried Ubuntu Live USB-Stick 13.04 x86_64 on my:
Acer V3-571G (the one that was slow earlier with partedmagic) with the following hardinfo. Ubuntu was very responsive and I was happy with the performance on that computer. Here is the /var/log/syslog.
Acer Aspire 8951G (my problem-computer) with the resulting /var/log/syslog contents. I selected to
try ubuntu from the stick. The system did not even get to the login screen before I gave up.
An interesting part from the end of the problem-syslog: timeout: killing 'keymap input/event, ------ rcu_sched self-detected stall on CPU, ------ BUG: soft lockup - CPU#3 stuck for 22s!
A memory test using Memtest86+ for several hours (1 iteration) passed ok.
I tried installing bumblebee and its suggested dependencies with no noticeable change in performance.
sudo powertop --time=60 --html produces the report PowerTop.html
grep Graphics /var/log/Xorg.0.log and
cat /var/log/Xorg.0.log results are at paste.ubuntu.com
cat /proc/cpuinfo | grep "cpu MHz" and
cat /proc/cpuinfo results are also at paste.ubuntu.com