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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.