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Thread: TIP: Improve bootup speed by reprofiling bootup

  1. #161
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    Re: TIP: Improve bootup speed by reprofiling bootup

    Interesting, that sounds like a boot race condition of some sort worth investigating. It's probably just the difference in disk read speed that's resulting in a network card not being ready when the bootup script runs to that point.
    Quote Originally Posted by tuxradar
    Linux's audio architecture is more like the layers of the Earth's crust than the network model, with lower levels occasionally erupting on to the surface, causing confusion and distress, and upper layers moving to displace the underlying technology that was originally hidden

  2. #162
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    Re: TIP: Improve bootup speed by reprofiling bootup

    That's what I thought. The window for failure was pretty small too. Fractions of a second.
    The interesting side effect is that the only obvious sign of failure at first is not getting an IP address. Which usually results in cursing at network manager.

    It took about 2 days of messing around and config restores to find the problem.
    Last edited by Yashiro; March 31st, 2009 at 02:41 AM.
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  3. #163
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    Re: TIP: Improve bootup speed by reprofiling bootup

    Quote Originally Posted by Yashiro View Post
    That's what I thought. The window for failure was pretty small too. Fractions of a second.
    The interesting side effect is that the only obvious sign of failure at first is not getting an IP address. Which usually results in cursing at network manager.

    It took about 2 days of messing around and config restores to find the problem.
    Fascinating. It would be interesting to chase down exactly why it happens; after all readahead is just "exposing" a bug, not really the culprit per se. A slightly faster hard drive would've probably done the same.
    Quote Originally Posted by tuxradar
    Linux's audio architecture is more like the layers of the Earth's crust than the network model, with lower levels occasionally erupting on to the surface, causing confusion and distress, and upper layers moving to displace the underlying technology that was originally hidden

  4. #164
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    Re: TIP: Improve bootup speed by reprofiling bootup

    I've just tried this on a fresh install of Jaunty beta, fully up to date. My machine is pretty decent so I was wondering if ther would be a big difference - Athlon64 3700 overclocked to 2.53GHz, 1GB DDR550 RAM, Seagate Barracuda S-ATA II 250GB drive, nForce4 motherboard.

    Without profiling: From the GRUB loader screen to full desktop took around 35.8 seconds.

    With profiling: From the GRUB loader screen to full desktop took around 33.2 seconds.

    Nothing incredible but worth having nonetheless.

  5. #165
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    Re: TIP: Improve bootup speed by reprofiling bootup

    Do you know, where on the disk is the profiling data written?

  6. #166
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    Re: TIP: Improve bootup speed by reprofiling bootup

    My boot on intrepid went from 31s to 35s

  7. #167
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    Re: TIP: Improve bootup speed by reprofiling bootup

    Thats better than nothing. Greater improvements could be had from removing useless or unused modules.
    Locke
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  8. #168
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    Re: TIP: Improve bootup speed by reprofiling bootup

    Quote Originally Posted by anthonyp View Post
    My boot on intrepid went from 31s to 35s
    I've been in that boot (I mean boat) too. Sometimes it will actually increase the boot times.
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  9. #169
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    Re: TIP: Improve bootup speed by reprofiling bootup

    Quote Originally Posted by crjackson View Post
    I've been in that boot (I mean boat) too. Sometimes it will actually increase the boot times.
    Wish I'd known aboot (I mean about) that before I tried it.

    My boot time went from 67s to 79s.

    Then I emptied /etc/readahead/boot, and it went to down to 74s.

    Which I guess I can live with. 74s and 67s feel the same to me (ie, slow). But I wish I'd read a little more of this thread first. And backed up /etc/readahead/boot. And maybe it wouldn't be a bad idea to include /etc in my periodic backups. (Ya think?)

    Note to self: learn to leave well enough alone.

  10. #170
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    Re: TIP: Improve bootup speed by reprofiling bootup

    Purge readahead then reinstall the package to restore the default list.
    Quote Originally Posted by tuxradar
    Linux's audio architecture is more like the layers of the Earth's crust than the network model, with lower levels occasionally erupting on to the surface, causing confusion and distress, and upper layers moving to displace the underlying technology that was originally hidden

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