Burst awareness scheduler over host interface
Instead of an arbitration over the link not considering bursts, a smart scheduler in a solid state drive (SSD) host interface is burst aware. The scheduler considers the type of transactions that are going to be sent over the interface. The scheduler sends the transactions in the most efficient way while maximizing the efficiency over the host DRAM. The schedulers may be calibrated from time to time on-the-fly to find the optimal configurations adapted to the current workload. The scheduler will organize the packets selected by the arbitration module so that the data transfers are sent in a burst of a predetermined sized to the host for optimum performance. For further optimization other packet types are sent in bursts as well.
1. A data storage device, comprising:
a memory device; and
a controller coupled to the memory device, wherein the controller is configured to:
determine a number of transaction layer packets (TLPs) that equal a burst;
arrange the number of TLPs one after another to form the burst, wherein the number of TLPs are a same transaction type; and
send the burst to a host device.
2. The data storage device of claim 1 , wherein the burst has a preconfigured value.
3. The data storage device of claim 1 , wherein the same transaction type is selected from the group consisting of: command fetching, host pointer fetching, host memory buffer (HMB) access, command completion posting, interrupt posting, and data transfer.
4. The data storage device of claim 3 , wherein the burst comprises data transfer TLPs.
5. The data storage device of claim 4 , wherein the burst additionally comprises interrupt posting.
6. The data storage device of claim 3 , wherein the controller is configured to group a second number of TLPs together to form a second burst, wherein the second burst comprises a mixture of transaction types that are different from the same transaction type.
7. The data storage device of claim 1 , wherein the determining is performed by a smart scheduler disposed in a host interface module (HIM).
8. The data storage device of claim 7 , wherein the HIM comprises a read arbiter and a write arbiter.
9. The data storage device of claim 8 , wherein the controller is configured to configure the read arbiter and the write arbiter with parameters for arbitration bursts.
10. The data storage device of claim 1 , wherein the controller is configured to dynamically adjust the determining.
11. The data storage device of claim 1 , wherein the controller is configured to adjust a size of the burst.
12. A data storage device, comprising:
a memory device; and
a controller coupled to the memory device, wherein the controller is configured to:
receive a plurality of transaction layer packets (TLPs) at a host interface module (HIM), wherein the plurality of TLPs comprise one of more transaction types selected from the group consisting of: command fetching, host pointer fetching, host memory buffer (HMB) access, command completion posting, interrupt posting, and data transfer;
arbitrate the plurality of TLPs; and
send a burst of TLPs to a host device, wherein the burst comprises a plurality of TLPs of a first size and of a same transaction type.
13. The data storage device of claim 12 , wherein the controller is further configured to calibrate the arbitrating dynamically.
14. The data storage device of claim 12 , wherein the controller is configured to adjust the first size.
15. The data storage device of claim 12 , wherein the controller is configured to measure a performance of the arbitrating.
16. The data storage device of claim 15 , wherein the controller is configured to adjust the arbitrating in response to the measuring.
17. The data storage device of claim 12 , wherein the HIM includes a plurality of arbiters.
18. A data storage device, comprising:
means to store data; and
a controller coupled to the means to store data, wherein the controller is configured to:
configure an arbitration burst setting in an arbiter;
operate the arbiter according to the arbitration burst setting;
measure performance of the arbiter using the arbitration burst setting;
adapt the arbitration burst setting to a new arbitration burst setting; and
repeat the configuring, operating, and measuring using the new arbitration burst setting instead of the arbitration burst setting.
19. The data storage device of claim 18 , wherein operating the arbiter comprises sending transaction layer packets (TLPs) in a burst to a host device, wherein the burst comprises a number of TLPs of data transfer.
20. The data storage device of claim 19 , wherein the burst comprises one or more interrupts interspersed within the burst.