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nuttx/drivers/usbhost
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Justin Hammond 8f88d73275 drivers/usbhost: Set the xHCI interrupter moderation interval. 
The interval was left at its reset value of 4000, a millisecond, which is
how long the controller waits after an event before reporting it.  Every
completion paid that, and mass storage spends three transfers on a
request.

Set it to 160, which is 40us, as Linux does.  Zero puts no bound on how
often a controller may interrupt: a keyboard on an interrupt endpoint then
takes them continuously and occupies a processor.

Measured on a DWC3 with a USB 2.0 drive, doorbell to interrupt 986-1021us
before and 13-56us after:

    reading 1MiB          before        after
    512 byte blocks      166 KB/s     775 KB/s
    32 KiB blocks      10666 KB/s   18618 KB/s

    mounting a FAT32 volume: 92.7s before, 21.1s after

Assisted-by: Claude:claude-opus-5
Signed-off-by: Justin Hammond <justin@dynam.ac>
2026-09-20 22:28:07 +08:00
..
CMakeLists.txt drivers/usbhost: Separate the xHCI driver from the PCI bus. 2026-08-18 09:35:23 -03:00
hid_parser.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
Kconfig drivers/usbhost: Separate the xHCI driver from the PCI bus. 2026-08-18 09:35:23 -03:00
Make.defs drivers/usbhost: Separate the xHCI driver from the PCI bus. 2026-08-18 09:35:23 -03:00
usbhost_bthci.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_cdcacm.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_cdcecm.c drivers/usbhost/usbhost_cdcecm.c: Converted CDC-ECM to lower half 2026-05-06 06:20:03 +08:00
usbhost_cdcmbim.c drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
usbhost_composite.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_composite.h
usbhost_devaddr.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_drivers.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_enumerate.c usbhost: Report each device as it is enumerated. 2026-08-09 02:09:47 +08:00
usbhost_findclass.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_ft232r.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_hidkbd.c drivers/usbhost: Do not unregister a HID keyboard that never registered. 2026-08-09 20:57:41 +08:00
usbhost_hidmouse.c drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
usbhost_hub.c arch/arm/src/stm32h5/stm32_usbdrdhost.c: Fixed Hub support 2026-04-19 14:24:40 +08:00
usbhost_max3421e.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_registerclass.c drivers/usbhost: Refuse to register the same class driver twice. 2026-08-08 14:55:34 -03:00
usbhost_registry.c drivers/usbhost: Use small lock to protect usbhost common function 2025-12-13 12:39:48 +08:00
usbhost_registry.h drivers/usbhost: Use small lock to protect usbhost common function 2025-12-13 12:39:48 +08:00
usbhost_skeleton.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_storage.c drivers/usbhost: Register the partitions on a mass storage device. 2026-08-08 14:40:52 -03:00
usbhost_trace.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_waiter.c include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usbhost_xboxcontroller.c drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
usbhost_xhci.c drivers/usbhost: Set the xHCI interrupter moderation interval. 2026-09-20 22:28:07 +08:00
usbhost_xhci.h drivers/usbhost: Set the xHCI interrupter moderation interval. 2026-09-20 22:28:07 +08:00
usbhost_xhci_pci.c drivers/usbhost: Separate the xHCI driver from the PCI bus. 2026-08-18 09:35:23 -03:00
usbhost_xhci_trace.c drivers/usbhost: Correct the xHCI controller name in a trace string. 2026-08-08 14:55:00 -03:00
usbhost_xhci_trace.h drivers/usbhost: Define the xHCI endpoint-allocation trace. 2026-08-08 14:55:00 -03:00