Ubuntu
transmission package

Transmission hangs while downloading data over 4 GB on encrypted file system

Bug #486412 reported by Sam K. Raju on 2009-11-21

This bug report is a duplicate of: Bug #431975: downloading a torrent to an encrypted home partition hangs and uses 100% CPU. Edit Remove

This bug affects 5 people

Affects		Status	Importance	Assigned to	Milestone
	transmission (Ubuntu)	New	Undecided	Unassigned

Bug Description

Binary package hint: transmission

I have ubuntu 9.10 (32 bit) installed with encrypted home directory. Whenever I download a file of over 4 GB (for ex: any dvd image), Transmission 1.75 hangs and CPU usage becomes 100%. When I try to kill the Transmission process, the status of the process becomes 'Zombie' and CPU usage is still 100%. I then need to restart the laptop.
The download of the same file works fine on other file systems without encryption.

Revision history for this message

Charles Kerr (charlesk) wrote on 2009-11-29:

The problem is that p2p involves a very large amount of random reads and writes. By running a BitTorrent client on an encrypted filesystem, you're generating a lot of overhead by constantly encrypting downloaded blocks and decrypting other blocks to upload them to peers.

I understand and sympathise with your problem, but I'm not sure that this is a Transmission problem, or even a solvable one.

Revision history for this message

Charles Kerr (charlesk) wrote on 2009-12-14:

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 431975, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.