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Subjecttime loss using ide-scsi under 2.4.21-pre5-ac2
I'm seeing seconds of time loss per minute while ripping CDs via grip 
and it's internal cdparanoia. Grip uses the scsi generic device for
ripping CDs. No loss is seen while not ripping. There may be a very
slight loss while just playing the CD via grip but it is to low to tell
on a time scale of 15 minutes.

The CD-ROM drive is being handled by ide-scsi and is the sole device on
a channel on a PDC20269 controller. The motherboard is an ASUS A7N8X
Deluxe using the nForce2 chipset. /proc/interrupts and dmesg outputs
below.

Kernel is 2.4.21pre5-ac2.
Grip is version 3.0.3-1.
OS is Debian sarge and is up to date as of last Sunday.
I'll be trying 2.4.21pre5-ac3 in a couple of hours after the queue of
ripped wav files is encoded.

This is the output from putting ntpdate in a while loop to check and
reset the time every minute. It was taken while ripping a short CD.

$while(true) ; do ntpdate 209.98.0.1; sleep 60; done
12 Mar 15:38:04 ntpdate[1009]: [snip] offset -0.059354 sec
12 Mar 15:39:04 ntpdate[1013]: [snip] offset -0.028293 sec
12 Mar 15:40:19 ntpdate[1045]: [snip] offset 15.256230 sec
12 Mar 15:41:48 ntpdate[1056]: [snip] offset 28.679519 sec
12 Mar 15:43:14 ntpdate[1061]: [snip] offset 24.881950 sec
12 Mar 15:44:43 ntpdate[1064]: [snip] offset 29.375965 sec
12 Mar 15:46:03 ntpdate[1068]: [snip] offset 19.302092 sec
12 Mar 15:47:04 ntpdate[1073]: [snip] offset 0.009752 sec
12 Mar 15:48:04 ntpdate[1076]: [snip] offset -0.013763 sec
12 Mar 15:49:04 ntpdate[1080]: [snip] offset 0.007685 sec

$ cat /proc/interrupts
CPU0
0: 153816 XT-PIC timer
1: 2176 XT-PIC keyboard
2: 0 XT-PIC cascade
5: 295 XT-PIC usb-ohci, eth0
10: 98525 XT-PIC ide4, ide5, nvidia
11: 185211 XT-PIC ide2, ide3, NVIDIA nForce Audio
12: 29728 XT-PIC PS/2 Mouse
14: 7048 XT-PIC ide0
15: 5219 XT-PIC ide1
NMI: 0
LOC: 153822
ERR: 6980
MIS: 0

# dmesg -s 66666
Linux version 2.4.21-pre5-ac2 (root@blip) (gcc version 3.2.1 20020924
(Debian prerelease)) #3 SMP Thu Mar 6 19:34:22 CST 2003BIOS-provided
physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009e800 (usable)
BIOS-e820: 000000000009e800 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000001fff0000 (usable)
BIOS-e820: 000000001fff0000 - 000000001fff3000 (ACPI NVS)
BIOS-e820: 000000001fff3000 - 0000000020000000 (ACPI data)
BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
511MB LOWMEM available.
On node 0 totalpages: 131056
zone(0): 4096 pages.
zone(1): 126960 pages.
zone(2): 0 pages.
Kernel command line: auto BOOT_IMAGE=Linux ro root=302 ide0=ata66
ide1=ata66 pci=biosirq hdg=scsi
ide_setup: ide0=ata66
ide_setup: ide1=ata66
ide_setup: hdg=scsi
Found and enabled local APIC!
Initializing CPU#0
Detected 1737.276 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 3460.30 BogoMIPS
Memory: 515464k/524224k available (1473k kernel code, 8368k reserved,
563k data, 120k init, 0k highmem)
Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
Inode cache hash table entries: 32768 (order: 6, 262144 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer cache hash table entries: 32768 (order: 5, 131072 bytes)
Page-cache hash table entries: 131072 (order: 7, 524288 bytes)
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 256K (64 bytes/line)
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU: After generic, caps: 0383fbff c1c3fbff 00000000 00000000
CPU: Common caps: 0383fbff c1c3fbff 00000000 00000000
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.40 (20010327) Richard Gooch (rgooch@atnf.csiro.au)
mtrr: detected mtrr type: Intel
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 256K (64 bytes/line)
Intel machine check reporting enabled on CPU#0.
CPU: After generic, caps: 0383fbff c1c3fbff 00000000 00000000
CPU: Common caps: 0383fbff c1c3fbff 00000000 00000000
CPU0: AMD Athlon(tm) XP 2100+ stepping 02
per-CPU timeslice cutoff: 731.30 usecs.
task migration cache decay timeout: 10 msecs.
SMP motherboard not detected.
enabled ExtINT on CPU#0
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Using local APIC timer interrupts.
calibrating APIC timer ...
..... CPU clock speed is 1737.2986 MHz.
..... host bus clock speed is 267.2766 MHz.
cpu: 0, clocks: 2672766, slice: 1336383
CPU0<T0:2672752,T1:1336368,D:1,S:1336383,C:2672766>
migration_task 0 on cpu=0
PCI: PCI BIOS revision 2.10 entry at 0xfb560, last bus=3
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: Using IRQ router default [10de/01e0] at 00:00.0
isapnp: Scanning for PnP cards...
isapnp: No Plug & Play device found
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
Journalled Block Device driver loaded
parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE]
parport0: irq 7 detected
i2c-core.o: i2c core module
i2c-dev.o: i2c /dev entries driver module
i2c-core.o: driver i2c-dev dummy driver registered.
i2c-proc.o version 2.6.1 (20010825)
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ
SERIAL_PCI ISAPNP enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
See Documentation/networking/vortex.txt
02:01.0: 3Com PCI 3c905C Tornado 2 at 0xd000. Vers LK1.1.18-ac
00:26:54:07:f5:82, IRQ 5
product code ffff rev 00.0 date 15-31-127
Internal config register is 1600000, transceivers 0x40.
8K byte-wide RAM 5:3 Rx:Tx split, autoselect/MII interface.
MII transceiver found at address 2, status 786d.
Enabling bus-master transmits and whole-frame receives.
02:01.0: scatter/gather enabled. h/w checksums enabled
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 439M
agpgart: unsupported bridge
agpgart: no supported devices found.
Uniform Multi-Platform E-IDE driver Revision: 7.00beta-2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
NFORCE2: IDE controller at PCI slot 00:09.0
NFORCE2: chipset revision 162
NFORCE2: not 100% native mode: will probe irqs later
AMD_IDE: Bios didn't set cable bits corectly. Enabling workaround.
AMD_IDE: Bios didn't set cable bits corectly. Enabling workaround.
AMD_IDE: PCI device 10de:0065 (nVidia Corporation) (rev a2) UDMA100
controller on pci00:09.0
ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:DMA
PDC20269: IDE controller at PCI slot 01:08.0
PDC20269: chipset revision 2
PDC20269: not 100% native mode: will probe irqs later
ide2: BM-DMA at 0xa000-0xa007, BIOS settings: hde:pio, hdf:pio
ide3: BM-DMA at 0xa008-0xa00f, BIOS settings: hdg:pio, hdh:pio
PDC20269: IDE controller at PCI slot 01:09.0
PDC20269: chipset revision 2
PDC20269: not 100% native mode: will probe irqs later
ide4: BM-DMA at 0xb400-0xb407, BIOS settings: hdi:pio, hdj:pio
ide5: BM-DMA at 0xb408-0xb40f, BIOS settings: hdk:pio, hdl:pio
hda: C/H/S=22070/16/255 from BIOS ignored
hda: Maxtor 54610H6, ATA DISK drive
blk: queue c0386380, I/O limit 4095Mb (mask 0xffffffff)
hdc: Maxtor 54610H6, ATA DISK drive
blk: queue c03867f8, I/O limit 4095Mb (mask 0xffffffff)
hde: Maxtor 98196H8, ATA DISK drive
blk: queue c0386c70, I/O limit 4095Mb (mask 0xffffffff)
hdg: TOSHIBA DVD-ROM SD-R1202, ATAPI CD/DVD-ROM drive
hdi: Maxtor 4G160J8, ATA DISK drive
blk: queue c0387560, I/O limit 4095Mb (mask 0xffffffff)
hdk: Maxtor 4G160J8, ATA DISK drive
blk: queue c03879d8, I/O limit 4095Mb (mask 0xffffffff)
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
ide2 at 0x9000-0x9007,0x9402 on irq 11
ide3 at 0x9800-0x9807,0x9c02 on irq 11
ide4 at 0xa400-0xa407,0xa802 on irq 10
ide5 at 0xac00-0xac07,0xb002 on irq 10
hda: attached ide-disk driver.
hda: host protected area => 1
hda: 90045648 sectors (46103 MB) w/2048KiB Cache, CHS=89331/16/63, UDMA(100)
hdc: attached ide-disk driver.
hdc: host protected area => 1
hdc: 90045648 sectors (46103 MB) w/2048KiB Cache, CHS=89331/16/63, UDMA(100)
hde: attached ide-disk driver.
hde: host protected area => 1
hde: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
UDMA(100)
hdi: attached ide-disk driver.
hdi: host protected area => 1
hdi: 320173056 sectors (163929 MB) w/2048KiB Cache, CHS=19929/255/63,
UDMA(133)
hdk: attached ide-disk driver.
hdk: host protected area => 1
hdk: 320173056 sectors (163929 MB) w/2048KiB Cache, CHS=19929/255/63,
UDMA(133)
ide-cd: passing drive hdg to ide-scsi emulation.
hdg: attached ide-scsi driver.
Partition check:
hda: hda1 hda2 hda3 < hda5 hda6 hda7 >
hdc: hdc1 hdc2 hdc3 < hdc5 hdc6 hdc7 >
hde: hde1 hde2
hdi: hdi1 hdi2
hdk: hdk1 hdk2
SCSI subsystem driver Revision: 1.00
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Vendor: TOSHIBA Model: DVD-ROM SD-R1202 Rev: 1026
Type: CD-ROM ANSI SCSI revision: 02
Vendor: TOSHIBA Model: DVD-ROM SD-R1202 Rev: 1026
Type: CD-ROM ANSI SCSI revision: 02
Vendor: TOSHIBA Model: DVD-ROM SD-R1202 Rev: 1026
Type: CD-ROM ANSI SCSI revision: 02
Vendor: TOSHIBA Model: DVD-ROM SD-R1202 Rev: 1026
Type: CD-ROM ANSI SCSI revision: 02
Vendor: TOSHIBA Model: DVD-ROM SD-R1202 Rev: 1026
Type: CD-ROM ANSI SCSI revision: 02
Vendor: TOSHIBA Model: DVD-ROM SD-R1202 Rev: 1026
Type: CD-ROM ANSI SCSI revision: 02
Vendor: TOSHIBA Model: DVD-ROM SD-R1202 Rev: 1026
Type: CD-ROM ANSI SCSI revision: 02
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
Attached scsi CD-ROM sr1 at scsi0, channel 0, id 0, lun 1
Attached scsi CD-ROM sr2 at scsi0, channel 0, id 0, lun 2
Attached scsi CD-ROM sr3 at scsi0, channel 0, id 0, lun 3
Attached scsi CD-ROM sr4 at scsi0, channel 0, id 0, lun 4
Attached scsi CD-ROM sr5 at scsi0, channel 0, id 0, lun 5
Attached scsi CD-ROM sr6 at scsi0, channel 0, id 0, lun 6
sr0: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.12
sr1: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
sr2: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
sr3: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
sr4: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
sr5: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
sr6: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
md: raid1 personality registered as nr 3
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 4096 buckets, 32Kbytes
TCP: Hash tables configured (established 32768 bind 32768)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 120k freed
Adding Swap: 1999832k swap-space (priority 2)
Adding Swap: 1999832k swap-space (priority 2)
Adding Swap: 530104k swap-space (priority 1)
Adding Swap: 530104k swap-space (priority 1)
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide0(3,2), internal journal
0: nvidia: loading NVIDIA Linux x86 nvidia.o Kernel Module 1.0-4191
Mon Dec 9 11:49:01 PST 2002
PCI: Setting latency timer of device 00:04.0 to 64
Intel 810 + AC97 Audio, version 0.24, 19:38:09 Mar 6 2003
PCI: Setting latency timer of device 00:06.0 to 64
i810: NVIDIA nForce Audio found at IO 0xe400 and 0xe000, MEM 0x0000 and
0x0000, IRQ 11
i810_audio: Audio Controller supports 6 channels.
i810_audio: Defaulting to base 2 channel mode.
i810_audio: Resetting connection 0
ac97_codec: AC97 Audio codec, id: ALG32 (ALC650)
i810_audio: AC'97 codec 0, new EID value = 0x05c7
i810_audio: AC'97 codec 0, DAC map configured, total channels = 6
usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
PCI: Setting latency timer of device 00:02.0 to 64
usb-ohci.c: USB OHCI at membase 0xe0c0a000, IRQ 5
usb-ohci.c: usb-00:02.0, PCI device 10de:0067 (nVidia Corporation)
usb.c: new USB bus registered, assigned bus number 1
usb.c: kmalloc IF dea00500, numif 1
usb.c: new device strings: Mfr=0, Product=2, SerialNumber=1
usb.c: USB device number 1 default language ID 0x0
Product: USB OHCI Root Hub
SerialNumber: e0c0a000
hub.c: USB hub found
hub.c: 3 ports detected
hub.c: standalone hub
hub.c: ganged power switching
hub.c: global over-current protection
hub.c: Port indicators are not supported
hub.c: power on to power good time: 2ms
hub.c: hub controller current requirement: 0mA
hub.c: port removable status: RRR
hub.c: local power source is good
hub.c: no over-current condition exists
hub.c: enabling power on all ports
usb.c: hub driver claimed interface dea00500
usb.c: kusbd: /sbin/hotplug add 1
usb.c: kusbd policy returned 0xfffffffe
PCI: No IRQ known for interrupt pin B of device 00:02.1.
usb-ohci.c: found OHCI device with no IRQ assigned. check BIOS settings!
Linux video capture interface: v1.00
se401.c: SE401 usb camera driver version 0.23 registering
usb.c: registered new driver se401
[events: 000000cf]
md: bind<hdc7,1>
[events: 000000cf]
md: bind<hda7,2>
md: hda7's event counter: 000000cf
md: hdc7's event counter: 000000cf
md: RAID level 1 does not need chunksize! Continuing anyway.
md1: max total readahead window set to 124k
md1: 1 data-disks, max readahead per data-disk: 124k
raid1: device hda7 operational as mirror 0
raid1: device hdc7 operational as mirror 1
raid1: raid set md1 active with 2 out of 2 mirrors
md: updating md1 RAID superblock on device
md: hda7 [events: 000000d0]<6>(write) hda7's sb offset: 28772736
md: hdc7 [events: 000000d0]<6>(write) hdc7's sb offset: 28772736
hub.c: port 1, portstatus 101, change 1, 12 Mb/s
hub.c: port 1 connection change
hub.c: port 1, portstatus 101, change 1, 12 Mb/s
[events: 000000a2]
md: bind<hdc6,1>
[events: 000000a2]
md: bind<hda6,2>
md: hda6's event counter: 000000a2
md: hdc6's event counter: 000000a2
md: RAID level 1 does not need chunksize! Continuing anyway.
md0: max total readahead window set to 124k
md0: 1 data-disks, max readahead per data-disk: 124k
raid1: device hda6 operational as mirror 0
raid1: device hdc6 operational as mirror 1
raid1: raid set md0 active with 2 out of 2 mirrors
md: updating md0 RAID superblock on device
md: hda6 [events: 000000a3]<6>(write) hda6's sb offset: 9999744
md: hdc6 [events: 000000a3]<6>(write) hdc6's sb offset: 9999744
hub.c: port 1, portstatus 101, change 0, 12 Mb/s
hub.c: port 1, portstatus 101, change 0, 12 Mb/s
hub.c: port 1, portstatus 101, change 0, 12 Mb/s
hub.c: port 1, portstatus 101, change 0, 12 Mb/s
hub.c: port 1, portstatus 103, change 10, 12 Mb/s
hub.c: new USB device 00:02.0-1, assigned address 2
usb.c: kmalloc IF dea003c0, numif 1
usb.c: new device strings: Mfr=1, Product=2, SerialNumber=0
usb.c: USB device number 2 default language ID 0x409
Product: CABO II
se401.c: SE401 camera found: Kensington VideoCAM 6701(5/7)
se401.c: firmware version: 30
se401.c: ExtraFeatures: 0 Sizes: 160x120 176x144 320x240 352x288 400x300
640x480
se401.c: registered new video device: video0
usb.c: se401 driver claimed interface dea003c0
usb.c: kusbd: /sbin/hotplug add 2
usb.c: kusbd policy returned 0xfffffffe
hub.c: port 2, portstatus 100, change 0, 12 Mb/s
hub.c: port 3, portstatus 100, change 0, 12 Mb/s
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide1(22,5), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.19, 19 August 2002 on md(9,0), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.19, 19 August 2002 on md(9,1), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide2(33,2), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide4(56,2), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide5(57,2), internal journal
EXT3-fs: mounted filesystem with ordered data mode.

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