Re: 2.6.17-mm6 libata stupid question...

[Valdis.Kletnieks@vt.edu]

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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