need help about the performance of RTW/RTAI/Comedi

Hi all,

Appologize for disturbing you again.

After trying many times and referring many documents, I can do nothing about
how to improve the performance of my simplest test demo (output path = a
sine wave generator--->gain--->Comedi data write, while input path = Comedi
data read--->sfun_rtai_scope). The demo is based on Matlab/RTW7.1(windows
version)+RTAI3.2+Comedi0.7.70.  I tried NI6024E and PCI9118dg of ADLINK
both, the following is my test result:

1: For 1 channel A/D,  the sample rate can be set up to 30KHz. But when
raised to 50KHz or higher, once using remote RTAI-LAB to connect the target
system, the computer will not response the connection, even not response to
either mouse or keyboard. The only thing i can do is to push the reset
button.

2: For 6 channels A/D, the sample rate can be set up to 5KHz only. when
raise it, the same thing happens.

I have been suggested to check the cmd->flags|=TRIG_WAKE_EOS, which would
cause interrupt every scan, but i don't know how to set or clear it in the
auto-generated code, even after reading many of the corresponding documents,
including rtai, comedi and Matlab/RTW.

I am wondering that whether the performance can be raised with the
auto-generated code? or should there be some tricks to improve it? I hope my
system can reach 10KHz sample rate with 6 channels A/D at least, can anyone
give me some hints? thank you!

Best Regards,

Wicky

BTW: I found that the messages can't be added to the mailing list once I
attach a file, why? hope you all can see this one!