[Pkg-mc-devel] [Bug 431207] Re: mc: Slows down desktop to a crawl when copying/moving data to external usb disk

Bug Watch Updater 431207 at bugs.launchpad.net
Thu Apr 7 05:27:38 UTC 2016

** Changed in: mc
       Status: New => Confirmed

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  mc: Slows down desktop to a crawl when copying/moving data to external
  usb disk

Status in Midnight Commander:
Status in mc package in Ubuntu:

Bug description:
  Binary package hint: mc


  I was just copying about 20GB of data from the internal hard disk to
  an external one using mc (midnight commander). Using mc the desktop
  almost freezes, at least it takes 4 minutes until firefox starts.
  Thunderbird does not show any emails anymore. Mp3 playback becomes
  horribly interrupted. Switching between applications takes ages.

  Using top on a text console, I saw that the %wa (iowait) entry in
  'top' gets up to 85% to 90% percent. Stopping the data copy in mc
  restores the good behaviour of the desktop.

  I then tried moving the data with mv. There is no iowait using mv, the
  desktop keeps responsive, only the %us (user space) entry in top shows
  some 80% percent, but that does not seem to slow down my desktop.

  I think that mc should change it's behaviour when copying to that used
  by mv.

  $ lsb_release -rd
  Description:    Ubuntu 8.04.3 LTS
  Release:        8.04

  $ apt-cache policy mc
    Mögliche Pakete:1:4.6.1-8ubuntu1
   *** 1:4.6.1-8ubuntu1 0
          500 http://de.archive.ubuntu.com hardy/universe Packages
          100 /var/lib/dpkg/status

  This is on a Pentium M 1200MHz.

  This is the external usb disk:
  Bus 004 Device 004: ID 0d49:5020 Maxtor

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