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Why is the hibernation performance (i.e the time taken to hibernate and wake up) on my laptop so poor with Ubuntu? This isn't a criticism per se but I'd be interested to know if there was a particular reason why it was so slow.

Is this a problem with every Ubuntu install?

My hardware specs:

  • Intel Core i3 2.13 GHz
  • 3 GB DDR3 RAM
  • 320 GB HDD

HDD benchmark:

/dev/sda5:
 Timing buffered disk reads:   96 MB in  3.06 seconds =  31.40 MB/sec
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Noticing this too. –  Ikke Dec 3 '10 at 11:14
    
I've noticed this as well. And I can't figure out why it's that way. Doesn't really matter to me, Windows is still slower waking up on my computer than Ubuntu is. :) –  jrg Dec 3 '10 at 11:22
    
yes, assuming the 3GB are completely used, that's how much it should take to hibernate/resume –  João Pinto Dec 3 '10 at 12:07
    
Suggest moving RAM swapping is the reason from comment to answer and accepting. –  hbdgaf Dec 3 '10 at 12:49

1 Answer 1

up vote 3 down vote accepted

Per your updates moving the entire RAM contents to swap (which is required because you need to save/restore the RAM state) would take 3*1024/31 = 99 seconds. That is probably the main time consuming operation.

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Hibernate doesn't save all ram; just the used ram, which usually ends up being less than half. –  psusi Feb 25 at 2:15

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