[PROBLEM] Tv-Stream from Mediaportal freezes peridiodically for ~18s

[Dracul]

Scrennshots 1 and 2 are before it freezes, 3 and 4 while it freezes and 5 after it freezed.

dmesg
http://pastebin.com/gzR9W3FR

vmstat 5 50 while the pi is idle
http://pastebin.com/3x4Nsky1

vmstat while the pi is playing the file
http://pastebin.com/T8wEK7vt


I notice while the stream is playing, the pi transfers about 600-700 KB/s over eth0. I think this is to low, while im playing the stream over nfs(without the pvr plugin which do not support nfs) the pi transfers about 1200 KB/s, but i dont know why smb wont gain more speed.