The PS3 has really not much memory, 256 MB RAM and I think 256 MB for graphics, but the dnet client doesn't need that much, only a few MBs...

Running Azureus for Bittorrent I can forget, because the supplied java version is not matching to the one Azureus would need, and on java.com you can't download a suitable version

So my Linux experience after that few trials is: very slow! for running just dnetc or other distributed computed clients it is ok, but if you want to do more: use a real machine with memory!