Intel® IXP400 Software
Access-Layer Components: ATM Driver Access (IxAtmdAcc) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
70 Document Number: 252539, Revision: 007
4.5.5.2 Real-Time Errors
Errors may occur during real-time traffic. Table 8 shows the different possible errors and the way
to resolve them.
Table 8. Real-Time Errors
Cause Consequences and Side Effects Corrective Action
Rx-free queue underflow
System is not able to store the
inbound traffic, which gets dropped.
AAL-5 CRC errors
PDU length invalid
Cells missing
•PDUs missing
Use the replenish function more often
Use more and bigger IXP_BUFs
Tx-Done overflow The hardware is blocked because the
Tx-done queue is full. Poll the TxDone queue more often.
Change the TxDone threshold.
IxAtmdAccPduSubmit()
reports
IX_ATMD_OVERLOADED System is unable to transmit a PDU. Increase the scheduler-transmit speed.
Slow down the submitted traffic.
Rx overflow
Inbound traffic is dropped.
AAL-5 CRC errors
PDU length invalid
Poll the Rx streams more often.