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    • 6. 发明授权
    • Method, apparatus and program product for low latency I/O adapter queuing in a computer system
    • 计算机系统中用于低延迟I / O适配器排队的方法,装置和程序产品
    • US07234004B2
    • 2007-06-19
    • US11001392
    • 2004-12-01
    • Christoph Raisch
    • Christoph Raisch
    • G06F3/00G06F13/00
    • G06F13/385
    • In a computer system, an I/O adapter comprises at least one I/O request mailbox for receiving I/O requests and data from a CPU. The mailbox is connected to at least one I/O request queue storage for storing a plurality of I/O requests and related data or main memory addresses received by the mailbox. A credit register is provided for storing the filling state of the queue storage. A connection network is designed and operated to transfer the contents of the credit register to the CPU for checking the filling state of the queue storage, to transfer an I/O request and related data to a queue of a selected request mailbox, and to activate a doorbell apparatus for signalling to the I/O adapter to process the I/O request including an access to the main memory by the I/O adapter if required.
    • 在计算机系统中,I / O适配器包括用于从CPU接收I / O请求和数据的至少一个I / O请求邮箱。 该邮箱被连接到至少一个I / O请求队列存储器,用于存储由邮箱接收的多个I / O请求和相关数据或主存储器地址。 提供了用于存储队列存储器的填充状态的信用寄存器。 连接网络被设计和操作以将信用寄存器的内容传送到CPU以检查队列存储器的填充状态,将I / O请求和相关数据传送到所选请求邮箱的队列,并激活 用于向I / O适配器发信号以便处理I / O请求的门铃装置,包括如果需要,I / O适配器访问主存储器。