100Mbit NIC Issue

[tedoyle]

I am currently using CVI-RT 9.0.  I was told to post my question to this forum (versus a CVI forum) since it involves a RT matter. 

I am having a problem with my system when the NIC is set to autonegoiate or 100MBit.  I get erratic system behavior.  At times the system seems to work fine.  Other times I get network timeouts.  However, when I force the NIC to 10MBit the problems seem to go away.  I had previously posted this issue in the CVI forum when using an earlier version of CVI-RT.  After many messages indicating that I was probalbly doing something wrong, I eventally heard that there was a problem with the stack and this issue was under investagation by R&D.  Is there still a issue with the stack related to the 100MBit speed setting?

[Smootastic]

Hi tedoyle,

What kind of chipset does this NIC use?  When you were told this was under investigation, you should have been given a number; do you know what that was? 

[tedoyle]

Kyle,

I am using a the EPM-5 (PUMA) PC\104 board from VersaLogic.  I have also used the CoreModule 600 PC\104 card from Ampro.  Both boards use the Intel 82551ER NIC and exhibit the same behavior regarding the 100MBit speed.  Also, as a additional bit of information, I am using the UDP function set (versus TCP).

I was not given a number regarding this issue.

Regards,

Tom

[Smootastic]

Hi Tom,

I was able to find the report that was filed before.  Unfortunately it is still under investigation.  The ID number for this issue is 102172; when a new version of CVI-RT is released you will be able to use that ID number to determine if the issue has been fixed or not.  Again, I apologize for the inconvenience, but we are working to fix this issue. 

[tedoyle]

Kyle,

Thanks for the reply.  I would like to point out that this is a rather serious issue.  The behavior of the system is very erratic when using the 100MBit speed with the UDP function set.  This configuration is not discourged in any NI documentation I am aware of.  Also, to my knowledge, there has been no release notes from NI regarding this matter.  There has been one or two updates to the RT package since this matter was first discovered. 

Tom