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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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