blog/Debian_boots_quicker_and_quicker.html

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   6     <title>Petter Reinholdtsen: Debian boots quicker and quicker</title>
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  12  <h1>
  13      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  14
  15  </h1>
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  17 </div>
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  19
  20     <div class="entry">
  21       <div class="title">Debian boots quicker and quicker</div>
  22       <div class="date">24th June 2009</div>
  23       <div class="body"><p>I spent Monday and tuesday this week in London with a lot of the
  24 people involved in the boot system on Debian and Ubuntu, to see if we
  25 could find more ways to speed up the boot system.  This was an Ubuntu
  26 funded
  27 <a href="https://wiki.ubuntu.com/FoundationsTeam/BootPerformance/DebianUbuntuSprint">developer
  28 gathering</a>. It was quite productive.  We also discussed the future
  29 of boot systems, and ways to handle the increasing number of boot
  30 issues introduced by the Linux kernel becoming more and more
  31 asynchronous and event base.  The Ubuntu approach using udev and
  32 upstart might be a good way forward.  Time will show.</p>
  33
  34 <p>Anyway, there are a few ways at the moment to speed up the boot
  35 process in Debian.  All of these should be applied to get a quick
  36 boot:</p>
  37
  38 <ul>
  39
  40 <li>Use dash as /bin/sh.</li>
  41
  42 <li>Disable the init.d/hwclock*.sh scripts and make sure the hardware
  43    clock is in UTC.</li>
  44
  45 <li>Install and activate the insserv package to enable
  46    <a href="http://wiki.debian.org/LSBInitScripts/DependencyBasedBoot">dependency
  47    based boot sequencing</a>, and enable concurrent booting.</li>
  48
  49 </ul>
  50
  51 These points are based on the Google summer of code work done by
  52 <a href="http://initscripts-ng.alioth.debian.org/soc2006-bootsystem/">Carlos
  53 Villegas</a>.
  54
  55 <p>Support for makefile-style concurrency during boot was uploaded to
  56 unstable yesterday.  When we tested it, we were able to cut 6 seconds
  57 from the boot sequence.  It depend on very correct dependency
  58 declaration in all init.d scripts, so I expect us to find edge cases
  59 where the dependences in some scripts are slightly wrong when we start
  60 using this.</p>
  61
  62 <p>On our IRC channel for this effort, #pkg-sysvinit, a new idea was
  63 introduced by Raphael Geissert today, one that could affect the
  64 startup speed as well.  Instead of starting some scripts concurrently
  65 from rcS.d/ and another set of scripts from rc2.d/, it would be
  66 possible to run a of them in the same process.  A quick way to test
  67 this would be to enable insserv and run 'mv /etc/rc2.d/S* /etc/rcS.d/;
  68 insserv'.  Will need to test if that work. :)</p>
  69 </div>
  70
  71       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
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