libata: 30sec delay during boot with cdrom attached

From: Gregor Jasny
Date: Thu Mar 01 2007 - 11:39:29 EST


Hi,

after switching to libata on my old Dell notebook, I get a 30 seconds
long delay during boot. If I remove the CDROM the boot process is as
fast as with the old ide driver.

Boot with cdrom:
[ 28.103034] ata_piix 0000:00:07.1: version 2.00ac7
[ 28.103234] ata1: PATA max UDMA/33 cmd 0x1F0 ctl 0x3F6 bmdma 0x860 irq 14
[ 28.103841] ata2: PATA max UDMA/33 cmd 0x170 ctl 0x376 bmdma 0x868 irq 15
[ 28.104535] scsi0 : ata_piix
[ 28.263015] ata1.00: ATA-7, max UDMA/100, 78242976 sectors: LBA48
[ 28.263486] ata1.00: ata1: dev 0 multi count 8
[ 28.269671] ata1.00: configured for UDMA/33
[ 28.270001] scsi1 : ata_piix
^-- Hangs here
[ 58.594321] ata2.00: ATAPI, max UDMA/33
[ 58.754241] ata2.00: configured for UDMA/33
[ 58.754852] scsi 0:0:0:0: Direct-Access ATA SAMSUNG
MP0402H UC10 PQ: 0 ANSI: 5
[ 58.755787] SCSI device sda: 78242976 512-byte hdwr sectors (40060 MB)
[ 58.756312] sda: Write Protect is off
[ 58.756595] sda: Mode Sense: 00 3a 00 00
[ 58.756657] SCSI device sda: write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 58.757459] SCSI device sda: 78242976 512-byte hdwr sectors (40060 MB)
[ 58.757976] sda: Write Protect is off
[ 58.758258] sda: Mode Sense: 00 3a 00 00
[ 58.758318] SCSI device sda: write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 58.758984] sda: sda1 sda2 sda3 sda4
[ 59.212482] sd 0:0:0:0: Attached scsi disk sda
[ 59.213005] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 59.213930] scsi 1:0:0:0: CD-ROM SAMSUNG CD-ROM SN-124
N102 PQ: 0 ANSI: 5
[ 59.236734] sr0: scsi3-mmc drive: 24x/24x cd/rw xa/form2 cdda tray
[ 59.252814] Uniform CD-ROM driver Revision: 3.20
[ 59.269038] sr 1:0:0:0: Attached scsi CD-ROM sr0
[ 59.269228] sr 1:0:0:0: Attached scsi generic sg1 type 5

My notebook has a PIIX4 controller:
IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)

This happens with all libata enabled kernels including the latest git
snapshot (2.6.21-rc2).

Can anyone shed some light on this?

Thanks,
Gregor

PS: As far as I remember this cdrom was blacklisted for DMA or
whatever reasons in early Linux 2.6 kernels.
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