How to analysis the output of powertop to increase battery lifetime

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I did some tests on various machines for Precise 12.04 LTS on the Good/Bad powertop settings. My research results are here:

http://kernel.ubuntu.com/~cking/power-benchmarking/powertop-good-bad-recommendations/results.txt

..and supporting data here:

http://kernel.ubuntu.com/~cking/power-benchmarking/powertop-good-bad-recommendations/powertop-good-bad-recommendations.ods

The best and least risk changes we added to the pm-utils package in Precise to help save power on battery for laptops.

By using a high precision multimeter it was apparent that some "Good" savings recommendations from powertop may in fact not be that useful, so one needs a lot of trial and error and an accurate way of assessing power consumption to ensure you select the optimal configuration for your hardware.

If you want to know more about the work that went into saving power in Precise, please refer to: https://wiki.ubuntu.com/Kernel/PowerManagement

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Raphaël
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Raphaël

Updated on September 18, 2022

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  • Raphaël
    Raphaël about 1 year

    I have 1 dedicated server. The server has several IPs. Some IP are dedicated for one particular domain.

    Ip1 = mysite.be
    Ip2 = mysite.fr
    Ip3 = mysite.com
    

    There is only one project. Each domain goes on the same location

    My website is on /var/www/vhosts/mysite.com/httpdocs

    For all other domain, i create a symlink.

    /var/www/vhosts/mysite.be/httpdocs -> /var/www/vhosts/mysite.com/httpdocs
    /var/www/vhosts/mysite.fr/httpdocs -> /var/www/vhosts/mysite.com/httpdocs
    

    ...

    When I go on mysite.com, all works. But when i go on mysite.be ... I have an output from codeIgniter :

    No input file specified. 
    

    I search more information about this error and I see that : https://stackoverflow.com/a/14578219/905867

    My .htaccess fil is already well configured... I guess

    Options +FollowSymLinks
    
    RewriteEngine on
    RewriteCond $1 !^(index\.php|robots\.txt|css|js|uploads|modules|public|timthumb\.php|\.htpasswd|google.*\.html|captcha)
    RewriteRule ^(.*)$ /index.php?/$1 [L] 
    

    The fact that the domain linked with symlink display the error "No input file specified." proves that the symlink is OK and the acl on server are OK too (chown and chmod).

    I think it's a little thing, but i don't know what. Anyone has a idea please ?

    Some others information : - I manage my server with plesk 11.0.9 #53 - My domain are "php as FastCGI module". If I use "as Apache Module, there is a blank page instead of error "No input file specified."