Created attachment 52316 [details]
HTop showing the huge RAM usage of kio_http webdav

Version:           4.4 (using KDE 4.4.5) 
OS:                Linux

I was copying a big file (1.3 GiB) from local filesystem to a local webdavs server through a gigabit connections when it started eating all my RAM. (More than 4GiBs!!)

Reproducible: Didn't try

Steps to Reproduce:
Copy with dolphin a big file from local fs to a webdavs.

Actual Results:  
The transfer occupies all of your RAM rapidly and the system becomes almost unresponsive.

Expected Results:  
Trasfer occupies part of the RAM as buffers, but the system doesn't starts swapping tremendously.

Local PC:
- encrypted filesystem;
- single big file (1.3GiB ISO image);
- dual core with 4GiBs RAM and 4GiBs swap.

Medium:
- gigabit ethernet;

Destination server:
- alfresco webdavs (webdav through secure connection);
- quad core Opteron.

I don't think the problem is all the rest: copying the same file to the same server through ssh (fish protocol) occupies the RAM but just as buffer, and does not swap at all.