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Date: Fri, 30 Aug 2002 01:33:46 -0300
From: Sergio Bruder <sergio@bruder.net>
To: Anssi Saari <as@sci.fi>
Cc: Andre Hedrick <andre@linux-ide.org>, vojtech@ucw.cz,
       linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: CD burning at 12x uses excessive CPU, although DMA is enabled
Message-ID: <20020830043346.GA5793@bruder.net>
Reply-To: sergio@bruder.net
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	Anssi Saari <as@sci.fi>, Andre Hedrick <andre@linux-ide.org>,
	vojtech@ucw.cz, linux-kernel@vger.kernel.org
References: <200204092206.02376.roger.larsson@norran.net> <Pine.LNX.4.10.10204091320450.25275-100000@master.linux-ide.org> <20020414123935.GA6441@sci.fi>
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On Sun, Apr 14, 2002 at 03:39:35PM +0300, Anssi Saari wrote:
> (...)
>
> I have now tried the writer on an old Pentium motherboard with Intel
> 430HX chipset and PIIX3. The performance problems didn't happen there,
> so I would guess this is more a problem with how Linux handles the VIA
> 686b southbridge.
> 
> But what can I do to help fix this problem?

We are now in 2.4.20-preBLAH time and appears that VIA 686b
southbridge still has the same problem (and appears to be that dont
surface with anothers controllers)

Ive just burned a image (.cue/.bin) with cdrdao and my load went
nuts, up to 5. Same motherboard chipset, same general conditions.
KT133a, VIA 686b southbridge, in that case with a LG combo drive
(HL-DT-ST RW/DVD GCC-4120B), hard-disk as /dev/hda (with ReiserFS),
combo drive as /dev/hdc.

What is strange is that problem dont appears with ISO images
(cdrecord-burned). There is any already-know solution for that
problem with VIA686b IDE?


Some info about the box in question:

cat /proc/version
Linux version 2.4.18-8cl (root@mapi2.distro.conectiva) (gcc version 2.95.4 20010319 (prerelease)) #1 Mon Aug 12 20:27:14 BRT 2002



processor: AMD Duron 750MHz



lsmod  | awk '{ print $1 }' | xargs
Module ide-scsi ide-cd cdrom scsi_mod agpgart NVdriver printer via686a i2c-proc
i2c-isa i2c-viapro i2c-core ppp_synctty ppp_async ppp_generic slhc ne2k-pci
8390 nls_iso8859-1 nls_cp437 vfat fat via82cxxx_audio uart401 ac97_codec sound
soundcore uhci usbcore reiserfs

(yeah, a 'tainted' kernel, 'sue me'(tm). I can repeat without
NVdriver loaded if anybody wants that)



cat /proc/ide/via
----------VIA BusMastering IDE Configuration----------------
Driver Version:                     3.34
South Bridge:                       VIA vt82c686b
Revision:                           ISA 0x40 IDE 0x6
Highest DMA rate:                   UDMA100
BM-DMA base:                        0xd000
PCI clock:                          33.3MHz
Master Read  Cycle IRDY:            0ws
Master Write Cycle IRDY:            0ws
BM IDE Status Register Read Retry:  yes
Max DRDY Pulse Width:               No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush:          yes                 yes
End Sector FIFO flush:         no                  no
Prefetch Buffer:               no                  no
Post Write Buffer:             no                  no
Enabled:                      yes                 yes
Simplex only:                  no                  no
Cable Type:                   80w                 40w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode:       UDMA       PIO       DMA       PIO
Address Setup:       30ns      90ns      30ns     120ns
Cmd Active:         330ns     330ns      90ns      90ns
Cmd Recovery:       270ns     270ns      30ns      30ns
Data Active:         90ns     300ns      90ns     330ns
Data Recovery:       30ns     300ns      30ns     270ns
Cycle Time:          30ns     600ns     120ns     600ns
Transfer Rate:   66.6MB/s   3.3MB/s  16.6MB/s   3.3MB/s



lspci -vvv
00:00.0 Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev 03)
	Subsystem: Elitegroup Computer Systems: Unknown device 0987
	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: 8
	Region 0: Memory at d8000000 (32-bit, prefetchable) [size=64M]
	Capabilities: [a0] AGP version 2.0
		Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2,x4
		Command: RQ=0 SBA- AGP+ 64bit- FW- Rate=x4
	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-

00:01.0 PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP] (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: 0000f000-00000fff
	Memory behind bridge: dc000000-ddffffff
	Prefetchable memory behind bridge: d0000000-d7ffffff
	BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
	Capabilities: [80] 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-

00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 40)
	Subsystem: VIA Technologies, Inc. VT82C686/A PCI to ISA Bridge
	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
	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-

00:07.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
	Subsystem: VIA Technologies, Inc. Bus Master 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 d000 [size=16]
	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-

00:07.2 USB Controller: VIA Technologies, Inc. USB (rev 16) (prog-if 00 [UHCI])
	Subsystem: VIA Technologies, Inc. (Wrong ID): Unknown device 1234
	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, cache line size 08
	Interrupt: pin D routed to IRQ 3
	Region 4: I/O ports at d400 [size=32]
	Capabilities: [80] 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-

00:07.3 USB Controller: VIA Technologies, Inc. USB (rev 16) (prog-if 00 [UHCI])
	Subsystem: VIA Technologies, Inc. (Wrong ID): Unknown device 1234
	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, cache line size 08
	Interrupt: pin D routed to IRQ 3
	Region 4: I/O ports at d800 [size=32]
	Capabilities: [80] 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-

00:07.4 Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 40)
	Subsystem: Elitegroup Computer Systems: Unknown device 0987
	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 ? routed to IRQ 9
	Capabilities: [68] 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-

00:07.5 Multimedia audio controller: VIA Technologies, Inc. VT82C686 AC97 Audio Controller (rev 50)
	Subsystem: Elitegroup Computer Systems: Unknown device 0987
	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 C routed to IRQ 5
	Region 0: I/O ports at dc00 [size=256]
	Region 1: I/O ports at e000 [size=4]
	Region 2: I/O ports at e400 [size=4]
	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-

00:0a.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS)
	Subsystem: Realtek Semiconductor Co., Ltd. RT8029(AS)
	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: I/O ports at ec00 [size=32]

01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX DDR] (rev b2) (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-
	Latency: 248 (1250ns min, 250ns max)
	Interrupt: pin A routed to IRQ 10
	Region 0: Memory at dc000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at d0000000 (32-bit, prefetchable) [size=128M]
	Expansion ROM at <unassigned> [disabled] [size=64K]
	Capabilities: [60] 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-
	Capabilities: [44] AGP version 2.0
		Status: RQ=31 SBA- 64bit- FW+ Rate=x1,x2,x4
		Command: RQ=31 SBA- AGP+ 64bit- FW- Rate=x4


Sergio Bruder
--
http://pontobr.org
pub  1024D/0C7D9F49 2000-05-26 Sergio Devojno Bruder <sergio@bruder.net>
     Key fingerprint = 983F DBDF FB53 FE55 87DF  71CA 6B01 5E44 0C7D 9F49
sub  1024g/138DF93D 2000-05-26
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