Re: [RFT] major libata update

[Tejun Heo <htejun@gmail.com>]

Avuton Olrich wrote:
[--snip--]
> ata1.00: tag 0 cmd 0x25 Emask 0x4 stat 0x40 err 0x0 (timeout)
> ata1: soft resetting port
> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
> ata1.00: configured for UDMA/25
> ata1: EH complete
> NETDEV WATCHDOG: eth2: transmit timed out
> ata1.00: limiting speed to UDMA/16
> ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x3 frozen
> ata1.00: (BMDMA stat 0x1)
> ata1.00: tag 0 cmd 0x25 Emask 0x4 stat 0x40 err 0x0 (timeout)
> ata1: soft resetting port
> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
> ata1.00: configured for UDMA/16
> ata1: EH complete
> ata1.00: limiting speed to PIO4
> ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x3 frozen
> ata1.00: (BMDMA stat 0x1)
> ata1.00: tag 0 cmd 0x25 Emask 0x4 stat 0x40 err 0x0 (timeout)
> ata1: soft resetting port
> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
> ata1.00: configured for PIO4
> ata1: EH complete

Are those timeouts back-to-back?  Can you post dmesg w/ timestamp 
(either turn on kernel message timestamping or simply post relevant part 
from /var/log/kern.log).  The drive thinks the command is complete.  You 
might be losing interrupts (you might want to diddle with acpi/irq 
routing stuff) or it could be some other hardware problem.

Does the drive + controller work okay on Windows?  I know people don't 
like this question so much but it's a great way to isolate hardware 
problems as they use completely different driver stack.

And, as show above, currently implemented speed down is way to 
simplistic.  We need a better speed-down sequence, but I guess that can 
wait for a bit.

> NETDEV WATCHDOG: eth0: transmit timed out
> eth0: transmit timed out, tx_status 00 status e000.
>  diagnostics: net 0cc0 media 8080 dma 000000a0 fifo 8800
>  Flags; bus-master 1, dirty 18790(6) current 18806(6)
>  Transmit list 37e3c5c0 vs. f7e3c5c0.
>  0: @f7e3c200  length 8000002a status 0000002a
>  1: @f7e3c2a0  length 8000002a status 0000002a
>  2: @f7e3c340  length 8000002a status 0000002a
>  3: @f7e3c3e0  length 8000002a status 0000002a
>  4: @f7e3c480  length 8000002a status 8000002a
>  5: @f7e3c520  length 8000002a status 8000002a
>  6: @f7e3c5c0  length 8000005f status 0000005f
>  7: @f7e3c660  length 8000005f status 0000005f
>  8: @f7e3c700  length 8000002a status 0000002a
>  9: @f7e3c7a0  length 8000002a status 0000002a
>  10: @f7e3c840  length 8000002a status 0000002a
>  11: @f7e3c8e0  length 8000002a status 0000002a
>  12: @f7e3c980  length 8000002a status 0000002a
>  13: @f7e3ca20  length 8000002a status 0000002a
>  14: @f7e3cac0  length 8000002a status 0000002a
>  15: @f7e3cb60  length 8000002a status 0000002a
> eth0: Resetting the Tx ring pointer.
> NETDEV WATCHDOG: eth0: transmit timed out

Increased transmit timeout is probably because the CPU is locked up 
performing PIOs.  I worry about this.  With irq-pio, the system stutters 
much more.  It might be better to perform the actual PIO part from a 
workqueue.  But then there are controllers which can't stand when CPU 
leaves it unattended while PIO is in progress...

--
tejun
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