[LAU] jack -> net driver

Hi, I have jack running on a windows machine with the net driver (slave). The master is fedora 18. The relevant incantations (taken from .jackdrc) are: Master: jackd -S -dalsa -dhw:0 -r44100 -p256 -n3 -H -M -Xseq Slave: jackd -X winmme -dnet -i2 -o2 -C8 -P24 -i8 ... both controlled by qjackctl This has been working pretty flawlessly for a few months but when I noticed with a certain instrument on the slave there was some midi latency, I decided to try fiddling with master -p (frames/period). I shut both slave and master down, changed period from 256 -> 128 and fired up the master -- all great, played some music , made a few live recordings etc. Then I started the slave (same command line) and noticed massive xruns (on the slave) -- so ... I change it all back to -p 256 but the xruns are still present (on the slave). Poking around a bit, I opened up the "options" on the master and it says Frames/Period: 256, I open up options on the slave, and it is grayed out but says: Frames/Period: 512. My questions are simply: 1) is qjackctl reporting this correctly on the slave? 2) if so, how or why would they be different? 3) is this why I'm seeing massive xruns? Any help appreciated. David