realtime performance of adl_pci9118

hi, all

I have build a test control system which include adlink pci9118dg card, with the matlab/simulink code auto generation function.

1: when i run the code generated by matlab/simulink in rtai, i found that the a/d sample rate of single rate is limited to about 33k, if i set it to 50k, system will down.

    how can i improve it? i hope the system can works at 10k with 5 channel of a/d synchronous, is this possible? i can't do the test now because my DAQ card only have 

     2 channel of a/d.

2: i will try "linux from scratch" to build a simplest linux with rtai, is it helpful for the real-time performance?

3: the following is the detail:

matlab 7.0 for windows

linux--2.4.20

rtai--3.2

comedi--0.7.70

comedilib--0.7.22

thank

regards,

wicky