[Bug 947664] Re: Unpacking linux-headers unbelievably slow in Lubuntu Precise (Beta 1)

[Ted]

I'm experiencing this problem as well.  I suggest all of those with the
problem post some information to help narrow the issue down.  In my case
I'm using a newly installed SSD and have a feeling the slow linux-
headers unpacking is just a side effect of slow write speeds.

Hard drive: SSD  (Corsair CSSD-V60GB2 w/ firmware update)
Size: 60GB
Filesystem: ext4 with dm_crypt full-disk encryption

Ubuntu 12.04 LTS
Kernel: 3.2.0-36-generic

Approximate time to unpack: 30 min

# hdparm -tT /dev/sda2
/dev/sda2:
 Timing cached reads:   6526 MB in  2.00 seconds = 3270.42 MB/sec
 Timing buffered disk reads: 398 MB in  3.00 seconds = 132.57 MB/sec

# dd if=/dev/zero of=tempfile bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 16.0206 s, 67.0 MB/s

During the delay:
iHR linux-headers-3.2.0-37-generic                              3.2.0-37.58

Immediately after the delay:
iU  linux-headers-3.2.0-37-generic                              3.2.0-37.58

linux-headers is unpacking 8152 small files, so my hunch is that there
is nothing special about the package, nor a problem with dpkg, but
instead that linux-headers is simply demonstrating the already slow disk
speeds we have but don't notice with other packages.

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https://bugs.launchpad.net/bugs/947664

Title:
  Unpacking linux-headers unbelievably slow in Lubuntu Precise (Beta 1)

Status in “dpkg” package in Ubuntu:
  Confirmed

Bug description:
  The below is an example line in an apt-get dist-upgrade which seems to
  take 30 minutes or more on a 2.1GHz CPU (one core of a quad core
  through Virtualbox). I've been looking at it for ages, and even had
  time to log in here and file the bug  - the line is still 'hung'.

  Unpacking linux-headers-3.2.0-18 (from .../linux-
  headers-3.2.0-18_3.2.0-18.28_all.deb)

  Can anyone explain this, or is it a bug in the configuration of
  Lubuntu, Apt-get or something. I read that there was a similarly
  behaving bug to do with dpkg using paranoid file synchronization but
  this length of delay is frankly a bit crazy.

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