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

Yury V. Zaytsev yury at shurup.com
Tue Oct 19 09:17:52 UTC 2010

Also relevant:


** Bug watch added: www.midnight-commander.org/ #2193

** Also affects: mc via
   Importance: Unknown
       Status: Unknown

** Bug watch added: www.midnight-commander.org/ #2300

mc: Slows down desktop to a crawl when copying/moving data to external usb disk
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Status in Midnight Commander - text-mode file manager: Unknown
Status in “mc” package in Ubuntu: New

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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