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Date:      Tue, 17 Nov 2020 19:13:38 +0000
From:      bugzilla-noreply@freebsd.org
To:        usb@FreeBSD.org
Subject:   [Bug 238235] Interrupt storms from USB bluetooth dongle
Message-ID:  <bug-238235-19105-w9hCInQrzd@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-238235-19105@https.bugs.freebsd.org/bugzilla/>
References:  <bug-238235-19105@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D238235

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

# dmesg -a | grep xhci
xhci0: <Intel Panther Point USB 3.0 controller> mem 0xf7d00000-0xf7d0ffff i=
rq
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=3D0 md=3DHOST spd=3DFULL=
 (12Mbps)
pwr=3DON (100mA)

  bLength =3D 0x0012
  bDescriptorType =3D 0x0001
  bcdUSB =3D 0x0200
  bDeviceClass =3D 0x00ff  <Vendor specific>
  bDeviceSubClass =3D 0x0001
  bDeviceProtocol =3D 0x0001
  bMaxPacketSize0 =3D 0x0040
  idVendor =3D 0x0b05
  idProduct =3D 0x17cb
  bcdDevice =3D 0x0112
  iManufacturer =3D 0x0001  <Broadcom Corp>
  iProduct =3D 0x0002  <BCM20702A0>


# systam -vm 1
2000 xhci0

#sysctl hw.acpi.cpu.cx_lowest=3DC2
hw.acpi.cpu.cx_lowest: C1 -> C2

# systam -vm 1
1000 xhci0

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