Packet Loss
Reasons Packet Could Be Discarded in Transit
A request or response packet can be discarded in transit for any of a number of reasons. Some reasons for packet discard are:
A packet CRC error is detected by a device in the packet's path between the two QPs.
Link Version error (LRH:LVer should be 0). If a device receives the packet and its Link Layer doesn't support the Link version indicated in the packet's LRH:LVer field, it discards the packet.
If the packet length exceeds the MTU size of the port on the other end of a link, the packet is not transmitted to that port. It is dropped.
If a packet's LRH:DLID field contains 0000h (the reserved DLID), then the packet is dropped by a switch or a router.
VL error. If the VL buffer that is required ...
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