Bandwidth aware request throttling

摘要

A method for managing bandwidth of a bus connecting a peripheral device to a host system includes sending, over the bus, a first read request to the host system, incrementing a pending read counter by an amount corresponding to the requested data, receiving, in response to sending the first read request, at least a portion of the requested data from the host system, decrementing the pending read counter by an amount corresponding to the at least the portion of the requested data, and comparing the counter and a threshold to obtain a result. Based on the result, a scheme is selected for managing the bandwidth of the bus. The scheme specifies a ratio of read requests and write requests to be sent on the bus. The method further includes sending, based on the scheme, a second request that is a write request or a second read request.

主权项

1. A method for managing bandwidth of a bus connecting a peripheral device to a host system, comprising:
sending, by the peripheral device and over the bus, a first request to the host system, wherein the first request comprises a first read request identifying requested data to be read from a memory of the host system; incrementing, in response to sending the first read request, a pending read counter by an amount corresponding to the requested data; receiving, in response to sending the first read request, at least a portion of the requested data from the host system; decrementing, in response to receiving the at least the portion of the requested data, the pending read counter by an amount corresponding to the at least the portion of the requested data; comparing the counter and a threshold to obtain a result; selecting, based on the result, a scheme from a plurality of schemes for managing the bandwidth of the bus, wherein the scheme specifies a ratio of read requests and write requests to be sent on the bus; and sending, based on the scheme, a second request, wherein the second request is one selected from a group consisting of a write request and a second read request, wherein the write request comprises data to be written to the memory of the host system.