I have this shares between my linux and windows machine, they use samba. Eventually, eg. when i’m listening to music, it stop working for a while, i see a cpu peak on top then when it drops song resumes playing.

Solution:

It looks like some other process is taking the whole cpu (not a big deal since this machine is old and slow) but like on windows (argh) you can control process priorities on linux, a simple renice did the work.

for running processes:

renice <priority value>  -p <pid>

for new processes:

nice -n <priority value>  <command>

Sources:

NixTutor