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The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

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Re: [vox-tech] Skipping sound
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Re: [vox-tech] Skipping sound



On Thu, Feb 27, 2003 at 04:14:26PM -0500, Mike Simons wrote:
> On Wed, Feb 26, 2003 at 03:43:14PM -0500, Mike Simons wrote:
> > On Wed, Feb 26, 2003 at 12:14:09PM -0800, Samuel Merritt wrote:
> > > If I have music playing and I move a window around, switch windows, or
> > > scroll a window, the music stutters. I'm using XFree86 4.2.1 and ALSA
> > > 0.9.0rc2 (defaults for Mandrake 9). 
> > [...]
> > > I've also tried switching between ALSA and OSS. It makes no difference. 
> > 
> >   I don't have a solution... but checking a few more details.
> > 
> > - Is the sound source a mp3, ogg, or CD in a CDROM drive?
> > - What sound player are you using and have you tried any others?
> > - When playing the sound source how busy does "top" or "vmstat 1" show
> >   the CPU being?
> > - Is the video card AGP or PCI?
> 
>   So my mail was delayed do to a local mail problem... I think I have
> answers to all of those questions.
> 
> could you run the following:
>   lspci -vvv

00:00.0 Host bridge: Advanced Micro Devices [AMD] AMD-760 MP [IGD4-2P]
System Controller (rev 11)
	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: 32
	Region 0: Memory at fc000000 (32-bit, prefetchable) [size=32M]
	Region 1: Memory at fb800000 (32-bit, prefetchable) [size=4K]
	Region 2: I/O ports at e800 [disabled] [size=4]
	Capabilities: [a0] AGP version 2.0
		Status: RQ=15 SBA+ 64bit- FW- Rate=x1,x2
		Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

00:01.0 PCI bridge: Advanced Micro Devices [AMD] AMD-760 MP [IGD4-2P]
AGP Bridge (prog-if 00 [Normal decode])
	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
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: 0000e000-0000dfff
	Memory behind bridge: fa600000-fa6fffff
	Prefetchable memory behind bridge: fb700000-fb7fffff
	BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-

00:07.0 ISA bridge: Advanced Micro Devices [AMD] AMD-768 [Opus] ISA (rev
05)
	Subsystem: Asustek Computer, Inc. A7M-D Mainboard
	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

00:07.1 IDE interface: Advanced Micro Devices [AMD] AMD-768 [Opus] IDE
(rev 04) (prog-if 8a [Master SecP PriP])
	Subsystem: Advanced Micro Devices [AMD] AMD-768 [Opus] IDE
	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: 32
	Region 4: I/O ports at d800 [size=16]

00:07.3 Bridge: Advanced Micro Devices [AMD] AMD-768 [Opus] ACPI (rev
03)
	Subsystem: Asustek Computer, Inc. A7M-D Mainboard
	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-

00:08.0 RAID bus controller: 3ware Inc 3ware 7000-series ATA-RAID (rev
01)
	Subsystem: 3ware Inc 3ware 7000-series ATA-RAID
	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: 32 (2250ns min), cache line size 08
	Interrupt: pin A routed to IRQ 16
	Region 0: I/O ports at d400 [size=16]
	Region 1: Memory at f9800000 (32-bit, non-prefetchable)
[size=16]
	Region 2: Memory at f9000000 (32-bit, non-prefetchable)
[size=8M]
	Expansion ROM at <unassigned> [disabled] [size=64K]
	Capabilities: [40] Power Management version 1
		Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:10.0 PCI bridge: Advanced Micro Devices [AMD] AMD-768 [Opus] PCI (rev
05) (prog-if 00 [Normal decode])
	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: 32
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=32
	I/O behind bridge: 0000c000-0000cfff
	Memory behind bridge: f5800000-f8ffffff
	Prefetchable memory behind bridge: fa700000-fb5fffff
	BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-

02:00.0 USB Controller: Advanced Micro Devices [AMD] AMD-768 [Opus] USB
(rev 07) (prog-if 10 [OHCI])
	Subsystem: Asustek Computer, Inc.: Unknown device 8044
	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: 32 (20000ns max), cache line size 08
	Interrupt: pin D routed to IRQ 19
	Region 0: Memory at f8800000 (32-bit, non-prefetchable)
[size=4K]

02:04.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev
10)
	Subsystem: Asustek Computer, Inc. CMI8738 6-channel audio
controller
	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: 32 (500ns min, 6000ns max)
	Interrupt: pin A routed to IRQ 17
	Region 0: I/O ports at c800 [size=256]
	Capabilities: [c0] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-

02:05.0 VGA compatible controller: Matrox Graphics, Inc. MGA 1064SG
[Mystique] (rev 03) (prog-if 00 [VGA])
	Subsystem: Matrox Graphics, Inc.: Unknown device 1000
	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: 32
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at fa800000 (32-bit, prefetchable) [size=8M]
	Region 1: Memory at f8000000 (32-bit, non-prefetchable)
[size=16K]
	Region 2: Memory at f7800000 (32-bit, non-prefetchable)
[size=8M]
	Expansion ROM at fa7f0000 [disabled] [size=64K]

02:06.0 Ethernet controller: Digital Equipment Corporation DECchip 21140
[FasterNet] (rev 22)
	Subsystem: D-Link System Inc DFE-500TX Fast Ethernet
	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: 32 (5000ns min, 10000ns max), cache line size 08
	Interrupt: pin A routed to IRQ 17
	Region 0: I/O ports at c400 [size=128]
	Region 1: Memory at f7000000 (32-bit, non-prefetchable)
[size=128]
	Expansion ROM at <unassigned> [disabled] [size=256K]

02:08.0 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
	Subsystem: Unknown device 807d:0035
	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: 32 (250ns min, 10500ns max), cache line size 08
	Interrupt: pin A routed to IRQ 19
	Region 0: Memory at f6800000 (32-bit, non-prefetchable)
[size=4K]
	Capabilities: [40] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-

02:08.1 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
	Subsystem: Unknown device 807d:0035
	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: 32 (250ns min, 10500ns max), cache line size 08
	Interrupt: pin B routed to IRQ 16
	Region 0: Memory at f6000000 (32-bit, non-prefetchable)
[size=4K]
	Capabilities: [40] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-

02:08.2 USB Controller: NEC Corporation USB 2.0 (rev 02) (prog-if 20
[EHCI])
	Subsystem: Unknown device 807d:1043
	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: 32 (4000ns min, 8500ns max), cache line size 08
	Interrupt: pin C routed to IRQ 17
	Region 0: Memory at f5800000 (32-bit, non-prefetchable)
[size=256]
	Capabilities: [40] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-


>   scanpci -v

pci bus 0x0000 cardnum 0x00 function 0x00: vendor 0x1022 device 0x700c
 AMD  Device unknown
  STATUS    0x2230  COMMAND 0x0006
  CLASS     0x06 0x00 0x00  REVISION 0x11
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x00
  BASE0     0xfc000008  addr 0xfc000000  MEM PREFETCHABLE
  BASE1     0xfb800008  addr 0xfb800000  MEM PREFETCHABLE
  BASE2     0x0000e801  addr 0x0000e800  I/O

pci bus 0x0000 cardnum 0x01 function 0x00: vendor 0x1022 device 0x700d
 AMD  Device unknown
  STATUS    0x0220  COMMAND 0x0007
  CLASS     0x06 0x04 0x00  REVISION 0x00
  HEADER    0x01  LATENCY 0x00
  PRIBUS    0x00  SECBUS 0x01  SUBBUS 0x01  SECLT 0x00
  IOBASE    0xe100  IOLIM 0xdfff  SECSTATUS 0x2220
  NOPREFETCH_MEMBASE 0xfa600000  MEMLIM 0xfa6fffff
  PREFETCH_MEMBASE   0xfb700000  MEMLIM 0xfb7fffff
  NO_FAST_B2B NO_SEC_BUS_RST NO_M_ABRT NO_VGA_EN NO_ISA_EN NO_SERR_EN
NO_PERR_EN

pci bus 0x0000 cardnum 0x07 function 0x00: vendor 0x1022 device 0x7440
 AMD  Device unknown
 CardVendor 0x1043 card 0x8044 (Card unknown)
  STATUS    0x0220  COMMAND 0x000f
  CLASS     0x06 0x01 0x00  REVISION 0x05
  BIST      0x00  HEADER 0x80  LATENCY 0x00  CACHE 0x00
  BYTE_0    0x72000  BYTE_1  0x00  BYTE_2  0x00  BYTE_3  0x00

pci bus 0x0000 cardnum 0x07 function 0x01: vendor 0x1022 device 0x7441
 AMD  Device unknown
 CardVendor 0x1022 card 0x7441 (AMD, Card unknown)
  STATUS    0x0200  COMMAND 0x0005
  CLASS     0x01 0x01 0x8a  REVISION 0x04
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x00
  BASE4     0x0000d801  addr 0x0000d800  I/O
  BYTE_0    0xf0422  BYTE_1  0x00  BYTE_2  0x80731d8  BYTE_3  0xffffffff

pci bus 0x0000 cardnum 0x07 function 0x03: vendor 0x1022 device 0x7443
 AMD  Device unknown
 CardVendor 0x1043 card 0x8044 (Card unknown)
  STATUS    0x0280  COMMAND 0x0000
  CLASS     0x06 0x80 0x00  REVISION 0x03
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x00
  BYTE_0    0x7409b100  BYTE_1  0x00  BYTE_2  0x8073550  BYTE_3
0xffffffff

pci bus 0x0000 cardnum 0x08 function 0x00: vendor 0x13c1 device 0x1001
 Device unknown
 CardVendor 0x13c1 card 0x1001 (Card unknown)
  STATUS    0x0290  COMMAND 0x0017
  CLASS     0x01 0x04 0x00  REVISION 0x01
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x08
  BASE0     0x0000d401  addr 0x0000d400  I/O
  BASE1     0xf9800000  addr 0xf9800000  MEM
  BASE2     0xf9000000  addr 0xf9000000  MEM
  MAX_LAT   0x00  MIN_GNT 0x09  INT_PIN 0x01  INT_LINE 0x0b
  BYTE_0    0x2010001  BYTE_1  0x00  BYTE_2  0x80738c8  BYTE_3
0xffffffff

pci bus 0x0000 cardnum 0x10 function 0x00: vendor 0x1022 device 0x7448
 AMD  Device unknown
  STATUS    0x2220  COMMAND 0x0017
  CLASS     0x06 0x04 0x00  REVISION 0x05
  HEADER    0x01  LATENCY 0x20
  PRIBUS    0x00  SECBUS 0x02  SUBBUS 0x02  SECLT 0x20
  IOBASE    0xc000  IOLIM 0xcfff  SECSTATUS 0x2200
  NOPREFETCH_MEMBASE 0xf5800000  MEMLIM 0xf8ffffff
  PREFETCH_MEMBASE   0xfa700000  MEMLIM 0xfb5fffff
  NO_FAST_B2B NO_SEC_BUS_RST NO_M_ABRT VGA_EN ISA_EN NO_SERR_EN
NO_PERR_EN

pci bus 0x0002 cardnum 0x00 function 0x00: vendor 0x1022 device 0x7449
 AMD  Device unknown
 CardVendor 0x1043 card 0x8044 (Card unknown)
  STATUS    0x8280  COMMAND 0x0017
  CLASS     0x0c 0x03 0x10  REVISION 0x07
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x08
  BASE0     0xf8800000  addr 0xf8800000  MEM
  MAX_LAT   0x50  MIN_GNT 0x00  INT_PIN 0x04  INT_LINE 0x0f

pci bus 0x0002 cardnum 0x04 function 0x00: vendor 0x13f6 device 0x0111
 Device unknown
 CardVendor 0x1043 card 0x8077 (Card unknown)
  STATUS    0x0210  COMMAND 0x0085
  CLASS     0x04 0x01 0x00  REVISION 0x10
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x00
  BASE0     0x0000c801  addr 0x0000c800  I/O
  MAX_LAT   0x18  MIN_GNT 0x02  INT_PIN 0x01  INT_LINE 0x0a

pci bus 0x0002 cardnum 0x05 function 0x00: vendor 0x102b device 0x051a
 Matrox MGA 1064SG
 CardVendor 0x102b card 0x1000 (Matrox Millennium II)
  STATUS    0x0280  COMMAND 0x0087
  CLASS     0x03 0x00 0x00  REVISION 0x03
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x00
  BASE0     0xfa800008  addr 0xfa800000  MEM PREFETCHABLE
  BASE1     0xf8000000  addr 0xf8000000  MEM
  BASE2     0xf7800000  addr 0xf7800000  MEM
  BASEROM   0xfa7f0000  addr 0xfa7f0000  not-decode-enabled
  MAX_LAT   0x00  MIN_GNT 0x00  INT_PIN 0x01  INT_LINE 0x0c
  BYTE_0    0x5f094f21  BYTE_1  0x00  BYTE_2  0x80746d0  BYTE_3
0xffffffff

pci bus 0x0002 cardnum 0x06 function 0x00: vendor 0x1011 device 0x0009
 Digital DC21140 10/100 Mb/s Ethernet
 CardVendor 0x1186 card 0x1100 (Card unknown)
  STATUS    0x0280  COMMAND 0x0017
  CLASS     0x02 0x00 0x00  REVISION 0x22
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x08
  BASE0     0x0000c401  addr 0x0000c400  I/O
  BASE1     0xf7000000  addr 0xf7000000  MEM
  MAX_LAT   0x28  MIN_GNT 0x14  INT_PIN 0x01  INT_LINE 0x0a
  BYTE_0    0x6f00  BYTE_1  0x00  BYTE_2  0x8074a48  BYTE_3  0xffffffff

pci bus 0x0002 cardnum 0x08 function 0x00: vendor 0x1033 device 0x0035
 NEC  Device unknown
 CardVendor 0x807d card 0x0035 (Card unknown)
  STATUS    0x0210  COMMAND 0x0016
  CLASS     0x0c 0x03 0x10  REVISION 0x41
  BIST      0x00  HEADER 0x80  LATENCY 0x20  CACHE 0x08
  BASE0     0xf6800000  addr 0xf6800000  MEM
  MAX_LAT   0x2a  MIN_GNT 0x01  INT_PIN 0x01  INT_LINE 0x0f
  BYTE_0    0x7e020001  BYTE_1  0x00  BYTE_2  0x8074dc0  BYTE_3
0xffffffff

pci bus 0x0002 cardnum 0x08 function 0x01: vendor 0x1033 device 0x0035
 NEC  Device unknown
 CardVendor 0x807d card 0x0035 (Card unknown)
  STATUS    0x0210  COMMAND 0x0016
  CLASS     0x0c 0x03 0x10  REVISION 0x41
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x08
  BASE0     0xf6000000  addr 0xf6000000  MEM
  MAX_LAT   0x2a  MIN_GNT 0x01  INT_PIN 0x02  INT_LINE 0x0b
  BYTE_0    0x7e020001  BYTE_1  0x00  BYTE_2  0x8075138  BYTE_3
0xffffffff

pci bus 0x0002 cardnum 0x08 function 0x02: vendor 0x1033 device 0x00e0
 NEC  Device unknown
 CardVendor 0x807d card 0x1043 (Card unknown)
  STATUS    0x0210  COMMAND 0x0016
  CLASS     0x0c 0x03 0x20  REVISION 0x02
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x08
  BASE0     0xf5800000  addr 0xf5800000  MEM
  MAX_LAT   0x22  MIN_GNT 0x10  INT_PIN 0x03  INT_LINE 0x0a
  BYTE_0    0x7e020001  BYTE_1  0x00  BYTE_2  0x80754b0  BYTE_3
0xffffffff

 
> ... I'm curious what the 
>   MAX_LAT   0x00  MIN_GNT 0x00  INT_PIN 0x01  INT_LINE 0x0b
> are from scanpci (part of xutils package).  You will need to be root to
> run scanpci but not lspci.
> 
>   The output will be a little long... I'm thinking that the pci card
> might be locking down the bus for too long.  There are supposed to be
> a way to limit how many cycles a pci device can hold the bus in a
> continuous chunk.  I'm not sure exactly how to change the lengths right
> now but figuring it out shouldn't take too long.

Supposedly, at around the time that this video card came out,
manufacturers were squeezing out a few extra percent on benchmarks by
having their drivers not check the command queue fullness on the video
card, and just sending the command. This resulted in locking the PCI bus
until a spot in the command queue opened up. 

I found this information at http://www.ews64.com/faulty.html

I wouldn't think XFree's mga driver would use this method, as it was
written by XFree driver writers, not Matrox. Interestingly enough,
mga(4) does have the PciRetry option, but as I've said in other messages
in this thread, this option does not affect the stuttering. 
 
>   Also have you tried playing sound via a bfp?
> something like:
>   mpg321 -s sound.mp3 | bfp

I have not tried this; bfp doesn't seem to be installed on my system,
nor does Mandrake have a bfp package. I'll try to track down and install
it later. 

-- 
Samuel Merritt
OpenPGP key is at http://meat.andcheese.org/~spam/spam_at_andcheese_dot_org.asc
Information about PGP can be found at http://www.mindspring.com/~aegreene/pgp/

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