infiniband - InfiniBand 中的门铃是什么？

Question

我正在阅读一份关于 InfiniBand 的文档，名为《 InfiniBand™ Host Channel Adapter Verb Implementer’s Guide 》--Intel，在第6.2.2章中，提到了一个概念叫做“Doorbell”，我在IB规范中没有找到关于这个概念的资料。我想知道门铃是通知机制还是其他什么？有详细的吗？谢谢!

Answer 1

定义是 6.2 下的两个部分:

Protection domain is used as a form of access security for memory regions, address vectors and queue pairs as defined by the InfiniBand Architecture. The Architecture requires a protection domain before a QP is allocated. Most vendors who expect to support user mode IO, will have a form of notification handshake from user mode. In most HCA’s this is a device memory address mapped to the process address space. We call this address the “doorbell” in this document.

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