kern/157397: [ada] ahci/ada/cam NCQ timeouts on Samsung and non-disable-ability

[Matthias Andree]

The following reply was made to PR kern/157397; it has been noted by GNATS.

From: Matthias Andree <mandree at FreeBSD.org>
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: kern/157397: [ada] ahci/ada/cam NCQ timeouts on Samsung and non-disable-ability
Date: Thu, 04 Apr 2013 02:18:58 +0200

 Further information requested by Jeremy Chadwick, from the
 -stable/-current lists:
 
 > While skimming Linux libata code and commits in the past, the only
 > glaringly obvious bug/issue I see is with SB600/SB700 chipsets (the
 > hardware revision apparently matters) and port multiplier (PMP) support
 > and soft resets.
 >
 > Are you using a port multiplier?  I doubt it, but I have to ask.
 
 I am not using a PMP as far as I know (unless one is buried on my Asus
 M4A78T-E main board). It would seem the drives are directly attached to
 the south bridge's SATA ports.
 
 >> Why only my Samsung HDD drive triggers this but not the WD drive, I do
 >> not know yet.
 >
 > Please provide "gpart show -p ada1" output, both here and in the PR,
 > if you could.
 
 =>        63  1953525105    ada1  MBR  (931G)
           63   209714337  ada1s1  freebsd  [active]  (100G)
    209714400         800          - free -  (400k)
    209715200    71680000  ada1s2  ntfs  (34G)
    281395200       15405          - free -  (7.5M)
    281410605   488263545  ada1s3  linux-data  (232G)
    769674150  1183851018          - free -  (564G)