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

malheum 431207 at bugs.launchpad.net
Tue Oct 19 09:01:08 UTC 2010

I have since upgraded to 10.04, both 64 and 32 bit. I haven't noticed the behaviour I described above since then. The mc in 10.04 really copies as fast as cp on the command line. 

Regarding the filesystem type: I have all my external drives formated
with ext3 and still mc on Ubuntu 8.04 used to copy data very slowly to
external disk.

The problem with ntfs on older Linux boxes (I don't remember the
versions anymore) happens when the ntfs cluster size != 4096, then
things really are slooooooooooow. This is an ntfs driver problem I
encountered while trying to backup the ntfs filesystem of a friend's
computer to external usb disk. There are quite some descriptions of that
bug if you search the web.

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