Method and system for DMA optimization in host bus adapters

Details Method and system for DMA optimization in host bus adapters Method and system for DMA optimization in host bus adapters

2008-07-08

2008-07-08

Tsai, Henry (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Data transfer specifying

C709S232000, C710S018000, C710S022000

Reexamination Certificate

active

07398335

ABSTRACT:
Method and system for optimizing DMA request processing is provided. The system includes a HBA that uses a dynamic DMA maximum write burst count sizing to optimize processing of write and read requests, wherein the HBA includes a DMA optimizer module that selects a certain write burst size to adjust performance when read and write DMA requests are being utilized. The DMA optimizer module can toggle between write and read request priority based on a maximum write request burst size. A shorter maximum write burst size provides more opportunity to issue read requests and a larger maximum burst size provides a better write request performance. The method includes, evaluating a read request throughput rate; evaluating a write request throughput rate; evaluating a read request utilization rate; evaluating a write request utilization rate; and adjusting a maximum write burst size.

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