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    SubjectRe: PATA -- pata_amd on 2.6.19 fails to IDENTIFY my DVD-ROM
    Tejun Heo wrote:

    > Rene Herman wrote:

    >> I just tried the PATA driver for my AMD756 chip. During boot, it hangs
    >> for 3 minutes failing to identify my DVD-ROM (secondary slave) and does
    >> not give me access to it after it timed out.
    >
    > Please give a shot at v2.6.20-rc2 and report what the kernel says.

    This IDENTIFY issue seems already fixed in -rc2. No more pause, and my
    DVD-ROM works fine again. Unfortunately, another issue seems to have
    cropped up. On 2.6.20-rc2, hdparm -t /dev/sda gets me ~ 24 M/s while
    both the old IDE driver and the 2.6.19 PATA driver do ~ 50 M/s

    2.6.20-rc2-ata:

    # hdparm -t /dev/sda

    /dev/sda:
    Timing buffered disk reads: 72 MB in 3.03 seconds = 23.75 MB/sec

    2.6.19-ata:

    # hdparm -t /dev/sda

    /dev/sda:
    Timing buffered disk reads: 150 MB in 3.00 seconds = 49.94 MB/sec

    Here's the ata part of the 2.6.20-rc2 dmesg:

    ===
    ata1: PATA max UDMA/66 cmd 0x1F0 ctl 0x3F6 bmdma 0xF000 irq 14
    ata2: PATA max UDMA/66 cmd 0x170 ctl 0x376 bmdma 0xF008 irq 15
    scsi0 : pata_amd
    ata1.00: ATA-7, max UDMA/133, 240121728 sectors: LBA
    ata1.00: ata1: dev 0 multi count 16
    ata1.00: configured for UDMA/66
    scsi1 : pata_amd
    ata2.00: ATAPI, max UDMA/33
    ata2.01: ATAPI, max UDMA/66
    ata2.00: configured for UDMA/33
    ata2.01: configured for UDMA/66
    scsi 0:0:0:0: Direct-Access ATA Maxtor 6Y120P0 YAR4 PQ: 0 ANSI: 5
    SCSI device sda: 240121728 512-byte hdwr sectors (122942 MB)
    sda: Write Protect is off
    sda: Mode Sense: 00 3a 00 00
    SCSI device sda: write cache: enabled, read cache: enabled, doesn't
    support DPO or FUA
    SCSI device sda: 240121728 512-byte hdwr sectors (122942 MB)
    sda: Write Protect is off
    sda: Mode Sense: 00 3a 00 00
    SCSI device sda: write cache: enabled, read cache: enabled, doesn't
    support DPO or FUA
    sda: sda1 < sda5 sda6 sda7 sda8 > sda2 sda3 sda4
    sda2: <minix: sda9 sda10 >
    sd 0:0:0:0: Attached scsi disk sda
    sd 0:0:0:0: Attached scsi generic sg0 type 0
    scsi 1:0:0:0: CD-ROM PLEXTOR CD-R PREMIUM 1.07 PQ: 0 ANSI: 5
    sr0: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
    Uniform CD-ROM driver Revision: 3.20
    sr 1:0:0:0: Attached scsi CD-ROM sr0
    sr 1:0:0:0: Attached scsi generic sg1 type 5
    scsi 1:0:1:0: CD-ROM PLEXTOR DVD-ROM PX-116A 1.00 PQ: 0 ANSI: 5
    sr1: scsi3-mmc drive: 48x/48x cd/rw xa/form2 cdda tray
    sr 1:0:1:0: Attached scsi CD-ROM sr1
    sr 1:0:1:0: Attached scsi generic sg2 type 5
    ===

    There's some difference with respect to caching versus 2.6.19 it seems?
    The same bit for 2.6.19:

    ===
    pata_amd 0000:00:07.1: version 0.2.4
    ata1: PATA max UDMA/66 cmd 0x1F0 ctl 0x3F6 bmdma 0xF000 irq 14
    ata2: PATA max UDMA/66 cmd 0x170 ctl 0x376 bmdma 0xF008 irq 15
    scsi0 : pata_amd
    ata1.00: ATA-7, max UDMA/133, 240121728 sectors: LBA
    ata1.00: ata1: dev 0 multi count 16
    ata1.00: configured for UDMA/66
    scsi1 : pata_amd
    ata2.00: ATAPI, max UDMA/33
    ata2.01: qc timeout (cmd 0xa1)
    ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata2: failed to recover some devices, retrying in 5 secs
    ata2: port is slow to respond, please be patient (Status 0xd8)
    ata2: port failed to respond (30 secs, Status 0xd8)
    ata2.01: qc timeout (cmd 0xa1)
    ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata2: failed to recover some devices, retrying in 5 secs
    ata2: port is slow to respond, please be patient (Status 0xd8)
    ata2: port failed to respond (30 secs, Status 0xd8)
    ata2.01: qc timeout (cmd 0xa1)
    ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata2: failed to recover some devices, retrying in 5 secs
    ata2: port is slow to respond, please be patient (Status 0xd8)
    ata2: port failed to respond (30 secs, Status 0xd8)
    ata2.00: configured for UDMA/33
    scsi 0:0:0:0: Direct-Access ATA Maxtor 6Y120P0 YAR4 PQ: 0 ANSI: 5
    SCSI device sda: 240121728 512-byte hdwr sectors (122942 MB)
    sda: Write Protect is off
    sda: Mode Sense: 00 3a 00 00
    SCSI device sda: drive cache: write back
    SCSI device sda: 240121728 512-byte hdwr sectors (122942 MB)
    sda: Write Protect is off
    sda: Mode Sense: 00 3a 00 00
    SCSI device sda: drive cache: write back
    sda: sda1 < sda5 sda6 sda7 sda8 > sda2 sda3 sda4
    sda2: <minix: sda9 sda10 >
    sd 0:0:0:0: Attached scsi disk sda
    sd 0:0:0:0: Attached scsi generic sg0 type 0
    scsi 1:0:0:0: CD-ROM PLEXTOR CD-R PREMIUM 1.07 PQ: 0 ANSI: 5
    sr0: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
    Uniform CD-ROM driver Revision: 3.20
    sr 1:0:0:0: Attached scsi CD-ROM sr0
    sr 1:0:0:0: Attached scsi generic sg1 type 5
    ===

    Rene.
    -
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