Date: Mon, 6 Dec 2021 17:04:29 +1030 From: Daniel O'Connor via freebsd-usb <freebsd-usb@freebsd.org> To: Hans Petter Selasky <hps@selasky.org> Cc: freebsd-usb@freebsd.org Subject: Re: Poor USB performance on ASUS 520 motherboard (no IRQ?) Message-ID: <499BEF34-F85D-4A0B-A4C1-30B7BCF40556@dons.net.au> In-Reply-To: <3ec03f87-ec26-cb0a-58bb-76fd32c49060@selasky.org> References: <A4A84F57-67F2-4402-B81C-9742F2C2B218@dons.net.au> <abf22f4f-e8fc-86c3-e463-d98d4353591a@selasky.org> <D9637948-8B50-45D3-93BD-ADB5FE7D964B@dons.net.au> <3ec03f87-ec26-cb0a-58bb-76fd32c49060@selasky.org>
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Hi,
Thanks, I discovered that if I connect the device to xhci0 it exhibits =
poor performance (and only shows 1000 IRQ/sec), however if I connect it =
to xhci1 it works fine (8kHz).
They show up slightly differently in dmesg:
xhci0: <XHCI (generic) USB 3.0 controller> mem 0xfcfa0000-0xfcfa7fff at =
device 0.0 on pci1
xhci0: 32 bytes context size, 64-bit DMA
usbus0 on xhci0
usbus0: 5.0Gbps Super Speed USB v3.0
xhci1: <XHCI (generic) USB 3.0 controller> mem 0xfcb00000-0xfcbfffff at =
device 0.3 on pci7
xhci1: 64 bytes context size, 64-bit DMA
usbus1 on xhci1
usbus1: 5.0Gbps Super Speed USB v3.0
However I don't know what the "context size" means, they are different =
PCI IDs too:
xhci0@pci0:1:0:0: class=3D0x0c0330 rev=3D0x00 hdr=3D0x00 =
vendor=3D0x1022 device=3D0x43ec subvendor=3D0x1b21 subdevice=3D0x1142
vendor =3D 'Advanced Micro Devices, Inc. [AMD]'
class =3D serial bus
subclass =3D USB
bar [10] =3D type Memory, range 64, base 0xfcfa0000, size 32768, =
enabled
PCI-e errors =3D Correctable Error Detected
Unsupported Request Detected
Corrected =3D Advisory Non-Fatal Error
xhci1@pci0:7:0:3: class=3D0x0c0330 rev=3D0x00 hdr=3D0x00 =
vendor=3D0x1022 device=3D0x15e0 subvendor=3D0x1043 subdevice=3D0x876b
vendor =3D 'Advanced Micro Devices, Inc. [AMD]'
device =3D 'Raven USB 3.1'
class =3D serial bus
subclass =3D USB
bar [10] =3D type Memory, range 64, base 0xfcb00000, size 1048576, =
enabled
I tried changing the imod value from 500 to 125 but it had no impact on =
the IRQ rate so I guess perhaps that controller is broken in some way..
> On 4 Dec 2021, at 16:32, Hans Petter Selasky <hps@selasky.org> wrote:
>=20
> On 12/4/21 03:12, Daniel O'Connor via freebsd-usb wrote:
>> How can I change it?
>=20
> Please refer to this:
>=20
> /* set up interrupt rate */
> XWRITE4(sc, runt, XHCI_IMOD(0), sc->sc_imod_default);
>=20
> --HPS
--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
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