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SubjectRe: [PATCH] usb audio.
On Fri, Oct 13, 2000 at 08:56:53AM -0700, Dunlap, Randy wrote:
> You shouldn't see the <clipped> messages about bandwidth alloc
> increased|reduced unless you are running at console loglevel
> 7 or higher (KERN_DEBUG) (could be via Alt-SysRq-7).
> I'll see about removing them anyway.

I didn't see them on console, I heard the hickups, so I looked into the
logfiles.

> I don't know about the sound hickups you are hearing. Tom Sailer
> suggested just a day or two ago something about changing the
> latency for the USB controller by using setpci.

I tried:

setpci -s 00:07.2 latency_timer=20
setpci -s 00:07.2 latency_timer=40
setpci -s 00:07.2 latency_timer=80

but without effect. However, the USB device doesn't have a latency
timer, so that probably explains.

> BTW, lspci -vv would give much more useful info than just
> using lspci. E.g., it would show the current latency
> value being used.

OK, information is attached.


Erik

--
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands
Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/
00:00.0 Host bridge: Intel Corporation 440BX/ZX - 82443BX/ZX Host bridge (AGP disabled) (rev 03)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR+
Latency: 64 set
Region 0: Memory at <unassigned> (32-bit, prefetchable) [size=64M]

00:02.0 VGA compatible controller: Neomagic Corporation NM2160 [MagicGraph 128XD] (rev 01) (prog-if 00 [VGA])
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin A routed to IRQ 11
Region 0: Memory at fd000000 (32-bit, prefetchable) [size=16M]
Region 1: Memory at fea00000 (32-bit, non-prefetchable) [size=2M]
Region 2: Memory at fed00000 (32-bit, non-prefetchable) [size=1M]

00:07.0 ISA bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 set

00:07.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01) (prog-if 80 [Master])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 set
Region 4: I/O ports at fcf0 [size=16]

00:07.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01) (prog-if 00 [UHCI])
Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin D routed to IRQ 9
Region 4: I/O ports at fcc0 [size=32]

00:07.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02)
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-

00:0a.0 CardBus bridge: Texas Instruments PCI1131 (rev 01)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 168 set, cache line size 20
Interrupt: pin A routed to IRQ 11
Region 0: Memory at 10000000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=00, secondary=01, subordinate=01, sec-latency=176
Memory window 0: 10400000-107ff000 (prefetchable)
Memory window 1: 10800000-10bff000
I/O window 0: 00001000-000010ff
I/O window 1: 00001400-000014ff
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt+ PostWrite+
16-bit legacy interface ports at 0001

00:0a.1 CardBus bridge: Texas Instruments PCI1131 (rev 01)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 168 set, cache line size 20
Interrupt: pin B routed to IRQ 11
Region 0: Memory at 10001000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=00, secondary=05, subordinate=05, sec-latency=176
Memory window 0: 10c00000-10fff000 (prefetchable)
Memory window 1: 11000000-113ff000
I/O window 0: 00001800-000018ff
I/O window 1: 00001c00-00001cff
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt+ PostWrite+
16-bit legacy interface ports at 0001

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