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    SubjectRe: 2.6.17-mm6 libata stupid question...
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    On Fri, 07 Jul 2006 01:33:56 EDT, Jeff Garzik said:
    > Valdis.Kletnieks@vt.edu wrote:
    > > There's only one minor detail - although the CD is (AFAIK) a UDMA/33 device
    ,
    > > the hard drive and the controller are both able to do UDMA/100.
    >
    > Currently both master and slave are forced to the least common
    > denominator speed.

    OK, that explains why I couldn't make it work. :)

    > Alan Cox has fixed this in a patch, for the controllers that allow
    > master and slave to run at different bus speeds (most allow this).

    Good to know. As a practical matter, the disk throughput is dominated by
    seek overhead, so I'm not seeing a *vast* performance hit. So I can wait
    till the patch shows up in a form I can get working with a -mm kernel.

    The only other thing I've noticed (possibly reported before when I wasn't
    paying attention to libata activity) was this when SMART started up:

    (The hardware involved, for those who missed the start of thread):

    lspci says:
    00:1f.1 IDE interface: Intel Corporation 82801CAM IDE U100 (rev 02)

    And 'hdparm -I /dev/sda' says:
    ATA device, with non-removable media
    Model Number: FUJITSU MHV2060AH
    Serial Number: NT25T5629CCL
    Firmware Revision: 00000096


    [ 53.109000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 53.110000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 53.111000] ata1: soft resetting port
    [ 53.420000] ata1.00: configured for UDMA/33
    [ 53.572000] ata1.01: configured for UDMA/33
    [ 53.572000] ata1: EH complete
    [ 53.573000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 53.574000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 53.575000] ata1: soft resetting port
    [ 53.882000] ata1.00: configured for UDMA/33
    [ 54.033000] ata1.01: configured for UDMA/33
    [ 54.033000] ata1: EH complete
    [ 54.034000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 54.035000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 54.036000] ata1: soft resetting port
    [ 54.343000] ata1.00: configured for UDMA/33
    [ 54.495000] ata1.01: configured for UDMA/33
    [ 54.495000] ata1: EH complete
    [ 54.496000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 54.497000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 54.498000] ata1: soft resetting port
    [ 54.805000] ata1.00: configured for UDMA/33
    [ 54.957000] ata1.01: configured for UDMA/33
    [ 54.957000] ata1: EH complete
    [ 54.958000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 54.959000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 54.960000] ata1: soft resetting port
    [ 55.267000] ata1.00: configured for UDMA/33
    [ 55.419000] ata1.01: configured for UDMA/33
    [ 55.419000] ata1: EH complete
    [ 55.420000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 55.421000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 55.422000] ata1: soft resetting port
    [ 55.729000] ata1.00: configured for UDMA/33
    [ 55.880000] ata1.01: configured for UDMA/33
    [ 55.880000] ata1: EH complete
    [ 55.917000] SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
    [ 55.918000] sda: Write Protect is off
    [ 55.919000] sda: Mode Sense: 00 3a 00 00
    [ 55.919000] SCSI device sda: drive cache: write back
    [ 55.920000] SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
    [ 55.921000] sda: Write Protect is off
    [ 55.922000] sda: Mode Sense: 00 3a 00 00
    [ 55.922000] SCSI device sda: drive cache: write back
    [ 56.524000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 56.525000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 56.526000] ata1: soft resetting port
    [ 56.833000] ata1.00: configured for UDMA/33
    [ 56.985000] ata1.01: configured for UDMA/33
    [ 56.985000] ata1: EH complete
    [ 57.099000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 57.100000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 57.101000] ata1: soft resetting port
    [ 57.408000] ata1.00: configured for UDMA/33
    [ 57.559000] ata1.01: configured for UDMA/33
    [ 57.559000] ata1: EH complete
    [ 57.673000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 57.674000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 57.675000] ata1: soft resetting port
    [ 57.982000] ata1.00: configured for UDMA/33
    [ 58.133000] ata1.01: configured for UDMA/33
    [ 58.133000] ata1: EH complete
    [ 58.247000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 58.248000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 58.249000] ata1: soft resetting port
    [ 58.557000] ata1.00: configured for UDMA/33
    [ 58.709000] ata1.01: configured for UDMA/33
    [ 58.709000] ata1: EH complete
    [ 58.833000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 58.834000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 58.835000] ata1: soft resetting port
    [ 59.143000] ata1.00: configured for UDMA/33
    [ 59.294000] ata1.01: configured for UDMA/33
    [ 59.294000] ata1: EH complete
    [ 59.418000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
    [ 59.419000] ata1.00: tag 0 cmd 0xb0 Emask 0x2 stat 0x50 err 0x0 (HSM violation)
    [ 59.420000] ata1: soft resetting port
    [ 59.727000] ata1.00: configured for UDMA/33
    [ 59.879000] ata1.01: configured for UDMA/33
    [ 59.879000] ata1: EH complete
    [ 59.880000] SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
    [ 59.881000] sda: Write Protect is off
    [ 59.882000] sda: Mode Sense: 00 3a 00 00
    [ 59.883000] SCSI device sda: drive cache: write back
    [ 59.884000] SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
    [ 59.886000] sda: Write Protect is off
    [ 59.887000] sda: Mode Sense: 00 3a 00 00
    [ 59.888000] SCSI device sda: drive cache: write back

    Lot of noise, but the system keeps going and /usr/sbin/smartd doesn't seem
    to notice a problem....

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