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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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Debian boots quicker and quicker</div>
  24       <div class="date">24th June 2009</div>
  25       <div class="body"><p>I spent Monday and tuesday this week in London with a lot of the
  26 people involved in the boot system on Debian and Ubuntu, to see if we
  27 could find more ways to speed up the boot system.  This was an Ubuntu
  28 funded
  29 <a href="https://wiki.ubuntu.com/FoundationsTeam/BootPerformance/DebianUbuntuSprint">developer
  30 gathering</a>. It was quite productive.  We also discussed the future
  31 of boot systems, and ways to handle the increasing number of boot
  32 issues introduced by the Linux kernel becoming more and more
  33 asynchronous and event base.  The Ubuntu approach using udev and
  34 upstart might be a good way forward.  Time will show.</p>
  35
  36 <p>Anyway, there are a few ways at the moment to speed up the boot
  37 process in Debian.  All of these should be applied to get a quick
  38 boot:</p>
  39
  40 <ul>
  41
  42 <li>Use dash as /bin/sh.</li>
  43
  44 <li>Disable the init.d/hwclock*.sh scripts and make sure the hardware
  45    clock is in UTC.</li>
  46
  47 <li>Install and activate the insserv package to enable
  48    <a href="http://wiki.debian.org/LSBInitScripts/DependencyBasedBoot">dependency
  49    based boot sequencing</a>, and enable concurrent booting.</li>
  50
  51 </ul>
  52
  53 These points are based on the Google summer of code work done by
  54 <a href="http://initscripts-ng.alioth.debian.org/soc2006-bootsystem/">Carlos
  55 Villegas</a>.
  56
  57 <p>Support for makefile-style concurrency during boot was uploaded to
  58 unstable yesterday.  When we tested it, we were able to cut 6 seconds
  59 from the boot sequence.  It depend on very correct dependency
  60 declaration in all init.d scripts, so I expect us to find edge cases
  61 where the dependences in some scripts are slightly wrong when we start
  62 using this.</p>
  63
  64 <p>On our IRC channel for this effort, #pkg-sysvinit, a new idea was
  65 introduced by Raphael Geissert today, one that could affect the
  66 startup speed as well.  Instead of starting some scripts concurrently
  67 from rcS.d/ and another set of scripts from rc2.d/, it would be
  68 possible to run a of them in the same process.  A quick way to test
  69 this would be to enable insserv and run 'mv /etc/rc2.d/S* /etc/rcS.d/;
  70 insserv'.  Will need to test if that work. :)</p>
  71 </div>
  72
  73       <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>
  74
  75
  76     </div>
  77
  78
  79
  80
  81     <div id="sidebar">
  82
  83
  84
  85 <h2>Archive</h2>
  86 <ul>
  87
  88 <li>2021
  89 <ul>
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  91 <li><a href="http://people.skolelinux.org/pere/blog/archive/2021/01/">January (2)</a></li>
  92
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  94
  95 <li><a href="http://people.skolelinux.org/pere/blog/archive/2021/05/">May (1)</a></li>
  96
  97 </ul></li>
  98
  99 <li>2020
 100 <ul>
 101
 102 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/02/">February (2)</a></li>
 103
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 121
 122 <li>2019
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 126
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 144
 145 </ul></li>
 146
 147 <li>2018
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 165
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 167
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 169
 170 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/12/">December (4)</a></li>
 171
 172 </ul></li>
 173
 174 <li>2017
 175 <ul>
 176
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 192
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 194
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 196
 197 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 198
 199 </ul></li>
 200
 201 <li>2016
 202 <ul>
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 224 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 225
 226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 227
 228 </ul></li>
 229
 230 <li>2015
 231 <ul>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 236
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 239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
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 241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
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 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
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 251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
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 253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 254
 255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 256
 257 </ul></li>
 258
 259 <li>2014
 260 <ul>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
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 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
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 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 275
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 283
 284 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 285
 286 </ul></li>
 287
 288 <li>2013
 289 <ul>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
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 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
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 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
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 301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
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 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
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 307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
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 309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
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 312
 313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 314
 315 </ul></li>
 316
 317 <li>2012
 318 <ul>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 327
 328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 329
 330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
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 338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 339
 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 343
 344 </ul></li>
 345
 346 <li>2011
 347 <ul>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
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 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
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 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
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 359 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
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 370
 371 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 372
 373 </ul></li>
 374
 375 <li>2010
 376 <ul>
 377
 378 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
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 399
 400 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 401
 402 </ul></li>
 403
 404 <li>2009
 405 <ul>
 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 423 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
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 425 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
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 427 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 428
 429 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 430
 431 </ul></li>
 432
 433 <li>2008
 434 <ul>
 435
 436 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 437
 438 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 439
 440 </ul></li>
 441
 442 </ul>
 443
 444
 445
 446 <h2>Tags</h2>
 447 <ul>
 448
 449  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 450
 451  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 452
 453  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 454
 455  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 456
 457  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 458
 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
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 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (175)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (7)</a></li>
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 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
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 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
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 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (28)</a></li>
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 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (424)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (22)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 514
 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (22)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (316)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (197)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (38)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (111)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 544
 545  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 546
 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 548
 549  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (59)</a></li>
 550
 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 552
 553  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 554
 555  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (70)</a></li>
 556
 557  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 558
 559  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 560
 561  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (61)</a></li>
 562
 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 564
 565  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 566
 567  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 568
 569  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (19)</a></li>
 570
 571  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (75)</a></li>
 572
 573  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 574
 575  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 576
 577 </ul>
 578
 579
 580     </div>
 581     <p style="text-align: right">
 582  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 583 </p>
 584
 585   </body>
 586 </html>