Date: Fri, 14 Mar 2008 16:17:52 -0400 From: "Alexander Sack" <pisymbol@gmail.com> To: "Isaac Mushinsky" <itz@mushinsky.net> Cc: freebsd-questions@freebsd.org Subject: Re: SATA problems (Abit IP35-Pro) Message-ID: <3c0b01820803141317u2a04047axd51c8594bc846f7b@mail.gmail.com> In-Reply-To: <bbe9e35d0803141057g7cae815bl8d80b0429280627b@mail.gmail.com> References: <bbe9e35d0803141057g7cae815bl8d80b0429280627b@mail.gmail.com>
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On Fri, Mar 14, 2008 at 1:57 PM, Isaac Mushinsky <itz@mushinsky.net> wrote:
>
> I can install with this AHCI setup, but have no idea what the implications
> are. Is there a known fix for SATA/IDE? Or is AHCI better?
If you can you should set it to AHCI which is a true native SATA mode
instead of IDE emulation.
AHCI is a true SATA hardware interface that exposes a fully featured
protocol stack (NCQ, hot-plug, staggered spin-up etc.).
Without it, you revert back to classical IDE over a SATA phy which doesn't
really slow down the physical connection but adds a lot of driver overhead,
i.e. by treating it as an IDE device, the driver performs a lot of
unnecessary I/O access such as having to select the drive even though its
point-to-point ("serial"), etc.
-aps
--
"What lies behind us and what lies in front of us is of little concern to
what lies within us." -Ralph Waldo Emerson
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