Method and system for DMA optimization in host bus adapters

Electrical computers and digital data processing systems: input/ – Input/output data processing – Data transfer specifying

Reexamination Certificate

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Details

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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