[Bug 238235] Interrupt storms from USB bluetooth dongle

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238235

--- Comment #1 from sauvr at protonmail.com ---
It's the same for me. I don't know if it's okay or not. But it reduces overall
system performance by ~1%
FreeBSD 13.0-CURRENT r367771

# dmesg -a | grep xhci
xhci0: <Intel Panther Point USB 3.0 controller> mem 0xf7d00000-0xf7d0ffff irq
16 at device 20.0 on pci0
xhci0: 32 bytes context size, 64-bit DMA
xhci_interrupt: host controller halted
xhci0: Port routing mask set to 0xffffffff
usbus0 on xhci0

# usbconfig dump_device_desc
ugen0.2: <Broadcom Corp BCM20702A0> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps)
pwr=ON (100mA)

  bLength = 0x0012
  bDescriptorType = 0x0001
  bcdUSB = 0x0200
  bDeviceClass = 0x00ff  <Vendor specific>
  bDeviceSubClass = 0x0001
  bDeviceProtocol = 0x0001
  bMaxPacketSize0 = 0x0040
  idVendor = 0x0b05
  idProduct = 0x17cb
  bcdDevice = 0x0112
  iManufacturer = 0x0001  <Broadcom Corp>
  iProduct = 0x0002  <BCM20702A0>


# systam -vm 1
2000 xhci0

#sysctl hw.acpi.cpu.cx_lowest=C2
hw.acpi.cpu.cx_lowest: C1 -> C2

# systam -vm 1
1000 xhci0

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