公开(公告)号：US11899969B1

公开(公告)日：2024-02-13

申请号：US17805633

申请日：2022-06-06

Applicant: Amazon Technologies, Inc.

Inventor： Barak Singer ,  Guy Nakibly ,  Jonathan Cohen ,  Simaan Bahouth

IPC: G06F3/06

CPC classification number: G06F3/0656 ,  G06F3/0604 ,  G06F3/0679

Abstract: Techniques are described for maintaining in-order execution when a dependency exists between write transactions. In some embodiments, a write re-order buffer (WROB) is configured to assign the same group ID to an incoming write transaction upon determining that the incoming write transaction is dependent on a pending write transaction. The WROB forwards the incoming write transaction to an interconnect fabric for routing to a completer device. The interconnect fabric enforces in-order execution when write transactions share the same group ID. The WROB can maintain a transaction log of pending write transactions and also track the statuses of responses for such transactions. Transaction responses can include responses sent from a completer to confirm that a transaction has actually been completed. Additionally, the WROB can send a response indicating completion back to the requester of the transaction. In some embodiments, the WROB is configured to send an early response to the requester.