Re: TR: ASUS A8V Deluxe, x86_64

Fortier,Vincent [Montreal] wrote:

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Tejun Heo wrote:

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Fortier,Vincent [Montreal] wrote:

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scsi0 : sata_via
ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata2.00: cfg 49:0f00 82:0000 83:0000 84:0000 85:0000 86:0000 
87:0000 88:001f
ata2.00: ATAPI, max UDMA/66
ata2.00: applying bridge limits
ata2.00: configured for UDMA/66

[--snip--]

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sd 0:0:0:0: Attached scsi disk sda
 Vendor: PLEXTOR   Model: DVDR   PX-716A    Rev: 1.09
 Type:   CD-ROM                             ANSI SCSI revision: 05

Above and the detailed log too indicate that everything went smooth 
the first time around.  Albert, do you have any ideas?  Could it be 
something related to irq-pio?

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I've checked Vincent't dmesg for 2.6.17-rc0 again.
(http://bugzilla.kernel.org/show_bug.cgi?id=5533)
(http://bugzilla.kernel.org/attachment.cgi?id=7700&action=view)

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It seems DMA commands are also affected by this problem, not PIO unique.

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ata2: command 0xa0 timeout, stat 0xd0 host_stat 0x1  <==== Device 
busy. DMA on going. ata2: translated ATA stat/err 0xd0/00 to SCSI 
SK/ASC/ASCQ 0xb/47/00 sr0: scsi-1 drive sr 1:0:0:0: Attached scsi 
CD-ROM sr0
ata2 is slow to respond, please be patient
ata2 failed to respond (30 secs)
BUG: warning at drivers/scsi/libata-core.c:3303/ata_pio_complete()

Call Trace: <ffffffff88031bd0>{:libata:ata_pio_task+1398}

=> It looks like the device is waiting for something.

After comparing the code of 2.6.17-rc4 and current libata upstream, 
maybe "flush" is the fix: The CDB was sent to the ATAPI device by PIO, 
but not flushed to device. So, the device was busy waiting for the CDB to arrive.

Hi Vincent,
 Could you please try 2.6.17-rc4, both with and without the attached 
patch, to see if the flush works. Thanks.

You where absolutely right on it Albert..  I've attached all the logs.

Maybie this patch should be sent to the 2.6.17 tree?

The only thing I've found curious is when using cdrecord -scanbus... With the patch or with the main patchset it only shows my plextor and stop showing my dvd reader and my yamaha cdr?  Although they both get discovered by k3b?  It probably has nothing to do with this.

If you'd like me to test anything else just ask!

- vin

Thanks for the test. Will submit the pio flush patch to Jeff for review.

For the cdrecord -scanbus problem, I saw similar problem before
when fiber channel device added/removed. Don't know why. Looks more
like cdrecord problem.

--
albert