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SubjectRe: [RFT] major libata update
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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