kern/161248: ahci: Time out, extremly slow response while copying large files

[Kalten]

>Number:         161248
>Category:       kern
>Synopsis:       ahci: Time out, extremly slow response while copying large files
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Oct 02 21:40:05 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Kalten
>Release:        9.0-BETA3
>Organization:
>Environment:
FreeBSD freeHugin.Walhalla.Leben 9.0-BETA3 FreeBSD 9.0-BETA3 #1: Sun Oct  2 17:17:40 CEST 2011     kalten at freeHugin.Walhalla.Leben:/usr/obj/usr/src/sys/HUGIN  amd64

>Description:
I used AHCI, i.e. the option ``device ahci'', in the kernel---so /dev/ada* for mounting.
When copying large files, there happen to be timeouts like:
---SCHNIPP---
ahcich2: Timeout on slot 18 port 0
ahcich2: is 00000000 cs 00040000 ss 00000000 rs 00040000 tfd c0 serr 00000000 cmd 0000d217
ahcich2: Timeout on slot 13 port 0
ahcich2: is 00000000 cs 00002000 ss 00000000 rs 00002000 tfd c0 serr 00000000 cmd 0000cd17
ahcich2: Timeout on slot 3 port 0
ahcich2: is 00000000 cs 00000008 ss 00000000 rs 00000008 tfd c0 serr 00000000 cmd 0000c317
ahcich2: Timeout on slot 11 port 0
ahcich2: is 00000000 cs 00000800 ss 00000000 rs 00000800 tfd c0 serr 00000000 cmd 0000cb17
---schnapp---
and the system becomes that slow, that starting an xterm takes up to e.g. one minute, and some ``ls'' about 40 seconds (the actual amount of time varies).

Some further information:
---SCHNIPP--- dmesg|grep -i ahci
ahci0: <Intel Cougar Point AHCI SATA controller> port 0xf070-0xf077,0xf060-0xf063,0xf050-0xf057,0xf040-0xf043,0xf020-0xf03f mem 0xfa305000-0xfa3057ff irq 20 at device 31.2 on pci0
ahci0: AHCI v1.30 with 6 6Gbps ports, Port Multiplier not supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich1: <AHCI channel> at channel 1 on ahci0
ahcich2: <AHCI channel> at channel 4 on ahci0
ahcich3: <AHCI channel> at channel 5 on ahci0
ada0 at ahcich0 bus 0 scbus3 target 0 lun 0
ada1 at ahcich1 bus 0 scbus4 target 0 lun 0
ada2 at ahcich2 bus 0 scbus5 target 0 lun 0
cd0 at ahcich3 bus 0 scbus6 target 0 lun 0
---schnapp---
It is an ``ASUS P8H67-M Rev.3.0 (New H67 B3 Revision)'' motherboard.

May be these information help.
Greetings, Kalten

>How-To-Repeat:

>Fix:


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