problems with AHCI on FreeBSD 8.2

Martin Sugioarto martin at
Tue Feb 14 18:23:24 UTC 2012

Am Tue, 14 Feb 2012 18:17:19 +0100
schrieb Harald Schmalzbauer <h.schmalzbauer at>:

> > I find it interesting that, at least so far, the only people
> > reporting problems of this type with the ahci.ko driver are people
> > using Samsung disks.  The only difference is that your models are
> > F1s while the OPs are F2s.
> I saw such timeouts long ago and mav@ had a look at my postings and he
> mentioned it could be a NCQ problem.
> I suspected the disks firmware.
> I never tracked it down further, because after replacing the Samsung
> (F3 in that case) disks with hitachi ones solved all my problems and
> gave a big performance kick as well (with zfs).
> You can find the discussion here:


I just want to add here that I am using 2 drives of type "Samsung
HD103SJ" (SpinPoint F3). And I did not have problems with ZFS and with
UFS either (for several years now). Everything has been deployed ontop
ada(4) since FreeBSD-8.

Actually the speed is very good (sequential read at 140 MB/s and more).


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