ahcich timeouts, only with ahci, not with ataahci

[George Liaskos]

I am having the same issue since Feb 20 which was my last update.

ahcich1: Timeout on slot 3
ahcich1: is 00000000 cs 00000018 ss 00000000 rs 00000018 tfd d0 serr 00000000
ahcich1: Timeout on slot 5
ahcich1: is 00000000 cs 00000060 ss 00000000 rs 00000060 tfd d0 serr 00000000
ahcich1: Timeout on slot 7
ahcich1: is 00000000 cs 00000180 ss 00000000 rs 00000180 tfd d0 serr 00000000
ahcich1: Timeout on slot 9
ahcich1: is 00000000 cs 00000600 ss 00000000 rs 00000600 tfd d0 serr 00000000

> dmesg | grep ahci
ahci0: <Intel ICH9M AHCI SATA controller> port
0x1c40-0x1c47,0x1834-0x1837,0x1838-0x183f,0x1830-0x1833,0x1c20-0x1c3f
mem 0xfc226000-0xfc2267ff irq 16 at device 31.2 on pci0
ahci0: [ITHREAD]
ahci0: AHCI v1.20 with 4 3Gbps ports, Port Multiplier not supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich0: [ITHREAD]
ahcich1: <AHCI channel> at channel 1 on ahci0
ahcich1: [ITHREAD]
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
cd0 at ahcich1 bus 0 scbus1 target 0 lun 0

On Tue, Feb 23, 2010 at 10:40 AM, Harald Schmalzbauer
<h.schmalzbauer at omnilan.de> wrote:
> Hello,
>
> I'm frequently getting my machine locked with ahcichX timeouts:
> ahcich2: Timeout on slot 0
> ahcich2: is 00000000 cs 00000001 ss 00000000 rs 00000001 tfd c0 serr
> 00000000
> ahcich2: Timeout on slot 8
> ahcich2: is 00000000 cs 00000100 ss 00000000 rs 00000100 tfd c0 serr
> 00000000
> ahcich2: Timeout on slot 8
> ahcich2: is 00000000 cs fffff07f ss ffffff7f rs ffffff7f tfd c0 serr
> 00000000
> ...
>
> This happens when backup over GbE overloads ZFS/HDD capabilities.
> I reduced vfs.zfs.txg.timeout to 1 to prevent the machine from locking up
> almost immediately, but from it still happens.
> When I don't use ahci but ataahci (the old driver if I understand things
> correct) I also see the ZFS burst write congestion, but this doesn't lead to
> controller timeouts, thus blocking the machine.
>
> Sometimes the machine recovers from the disk lock, but most often I have to
> reboot.
>
> Kernel is from Feb. 19, so recent ahci improovements are active.
> Controller is ICH9R with 3 Samsung F3 SpinPoints.
>
> Any ideas how to work arround the hangs other than using the old ahci
> driver?
>
> Thanks,
>
> -Harry
>
>