ahci errors on 8-stable

[Nenhum_de_Nos]

hail,

I've seen these errors in a production machine in deep disk load (scp and
bsdtar in heavy use):

ahcich0: Timeout on slot 1
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000
ahcich0: Timeout on slot 16
ahcich0: is 00000000 cs 0000e000 ss ffffffff rs ffffffff tfd c0 serr 00000000
tun0: link state changed to DOWN
tun0: link state changed to UP
ahcich0: Timeout on slot 13
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000
ahcich0: Timeout on slot 9
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000
tun0: link state changed to DOWN
tun0: link state changed to UP
tun0: link state changed to DOWN
tun0: link state changed to UP
tun0: link state changed to DOWN
tun0: link state changed to UP
ahcich0: Timeout on slot 30
ahcich0: is 00000000 cs 38000000 ss ffffffff rs ffffffff tfd c0 serr 00000000
ahcich0: Timeout on slot 11
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 3, size: 4096
ahcich0: Timeout on slot 14
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000
tun0: link state changed to DOWN
tun0: link state changed to UP
ahcich0: Timeout on slot 9
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000
tun0: link state changed to DOWN
tun0: link state changed to UP
ahcich0: Timeout on slot 15
ahcich0: is 00000000 cs fc007fff ss ffffffff rs ffffffff tfd c0 serr 00000000
ahcich0: Timeout on slot 14
ahcich0: is 00000000 cs 00003ff8 ss ffffffff rs ffffffff tfd c0 serr 00000000
ahcich0: Timeout on slot 6
ahcich0: is 00000000 cs 8000003f ss ffffffff rs ffffffff tfd c0 serr 00000000
ahcich0: Timeout on slot 1
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000
ahcich0: Timeout on slot 1
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000
ahcich0: Timeout on slot 1
ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000

[matheus at optimus ~]$ uname -a
FreeBSD xxx 8.0-STABLE FreeBSD 8.0-STABLE #3: Wed Feb 10 11:09:34 BRT 2010
    root at xxx:/usr/obj/usr/src/sys/optimus  amd64

this machine has 6GB ram, but just around 5GB are available:

Copyright (c) 1992-2010 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.0-STABLE #3: Wed Feb 10 11:09:34 BRT 2010
    root at xxx:/usr/obj/usr/src/sys/optimus amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 Quad CPU    Q9400  @ 2.66GHz (2666.38-MHz K8-class
CPU)
  Origin = "GenuineIntel"  Id = 0x1067a  Stepping = 10
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
[root at optimus /var/log]# head -20 dmesg.yesterday
Copyright (c) 1992-2010 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.0-STABLE #3: Wed Feb 10 11:09:34 BRT 2010
    root at xxx:/usr/obj/usr/src/sys/optimus amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 Quad CPU    Q9400  @ 2.66GHz (2666.38-MHz K8-class
CPU)
  Origin = "GenuineIntel"  Id = 0x1067a  Stepping = 10
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0x408e3fd<SSE3,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE>
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant
real memory  = 6442450944 (6144 MB)
avail memory = 6058479616 (5777 MB)
ACPI APIC Table: <INTEL  DG45ID  >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s)
 cpu0 (BSP): APIC ID:  0

I use a small ZFS pool:

[root at optimus /var/log]# zpool status
  pool: pool
 state: ONLINE
 scrub: none requested
config:

        NAME          STATE     READ WRITE CKSUM
        pool          ONLINE       0     0     0
          label/zfs1  ONLINE       0     0     0
          label/zfs2  ONLINE       0     0     0

errors: No known data errors

using two 1TB disks.

should I fear these errors ?

thanks,

matheus


-- 
We will call you cygnus,
The God of balance you shall be

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