Read performance on a SATA storage device behind a host bus adapter
Examples may include a storage device coupled to a host bus adapter and a SATA controller over a SATA interface. The storage device includes a memory and a storage device controller. The storage device controller includes a collision detector and counter component to detect and count collisions on the SATA interface for a period of time; and a bus limiter component to detect a type of workload on the SATA interface, and when the detected workload is only read commands and a number of detected collisions is less than a detected collision threshold during the period of time, to set a limit on a maximum number of commands sent by the host bus adapter to the storage device controller over the SATA interface.
1. An apparatus comprising:
a storage device controller, coupled to a host bus adapter and a SATA controller over a SATA interface, the storage device controller comprising
a collision detector and counter component to detect and count collisions on the SATA interface for a period of time; and
a bus limiter component to detect a type of workload on the SATA interface, and when the detected workload is only read commands and a number of detected collisions is less than a detected collision threshold during the period of time, to set a limit on a maximum number of commands received by the storage device controller over the SATA interface.
2. The apparatus of claim 1 , the bus limiter to remove the limit when the detected workload is not only read commands.
3. The apparatus of claim 1 , the bus limiter to remove the limit when the number of detected collisions is not less than the detected collision threshold.
4. The apparatus of claim 1 , the collisions comprising one or more transfer ready (XRDY) collisions on the SATA interface.
5. The apparatus of claim 1 , the bus limiter to reset the collision detector and counter when a predetermined period of time has elapsed.
6. The apparatus of claim 1 , wherein the limit on the maximum number of commands is less than a queue depth of the SATA interface.
7. A storage device comprising:
a memory; and
a storage device controller, coupled to the memory, and coupled to a host bus adapter and a SATA controller over a SATA interface, the storage device controller comprising
a collision detector and counter component to detect and count collisions on the SATA interface for a period of time; and
a bus limiter component to detect a type of workload on the SATA interface, and when the detected workload is only read commands and a number of detected collisions is less than a detected collision threshold during the period of time, to set a limit on a maximum number of commands received by the storage device controller over the SATA interface.
8. The storage device of claim 7 , the bus limiter to remove the limit when the detected workload is not only read commands.
9. The storage device of claim 7 , the bus limiter to remove the limit when the number of detected collisions is not less than the detected collision threshold.
10. The storage device of claim 7 , the collisions comprising one or more transfer ready (XRDY) collisions on the SATA interface.
11. The storage device of claim 7 , the bus limiter to reset the collision detector and counter when a predetermined period of time has elapsed.
12. The storage device of claim 7 , wherein the limit on the maximum number of commands is less than a queue depth of the SATA interface.
13. The storage device of claim 7 , the memory comprising a NAND memory.
14. A method comprising:
detecting and counting collisions on a SATA interface for a period of time, the SATA interface coupling a host bus adapter and a SATA controller to a storage device controller of a storage device;
detecting a type of workload on the SATA interface, and
setting a limit on a maximum number of commands received by the storage device controller over the SATA interface when the detected workload is only read commands and a number of detected collisions is less than a detected collision threshold during the period of time.
15. The method of claim 14 , comprising removing the limit when the detected workload is not only read commands.
16. The method of claim 14 , comprising removing the limit when the number of detected collisions is not less than the detected collision threshold.
17. The method of claim 14 , the collisions comprising one or more transfer ready (XRDY) collisions on the SATA interface.
18. The method of claim 14 , comprising resetting the collision detector count when a predetermined period of time has elapsed.