Date: Tue, 15 Dec 2009 01:36:27 -0800 From: Wes Peters <barnaclewes@gmail.com> To: Norikatsu Shigemura <nork@freebsd.org> Cc: Alexander Motin <mav@freebsd.org>, freebsd-current@freebsd.org Subject: Re: How do I use NCQ of Intel X25-E(SSD) on ahci(4)? Message-ID: <f83770800912150136u1fbabd2ak7b0cd15f85c0099f@mail.gmail.com> In-Reply-To: <20091119004651.7432a6e4.nork@FreeBSD.org> References: <20091119004651.7432a6e4.nork@FreeBSD.org>
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On Wed, Nov 18, 2009 at 7:46 AM, Norikatsu Shigemura <nork@freebsd.org> wro=
te:
> Hi Alexander!
>
> =A0 =A0 =A0 =A0I have a Intel 64GB SSD(X25-E) and a Western Digital Cavia=
r Green
> =A0 =A0 =A0 =A01TB HDD (WD10EADS), and use them on ahci(4). =A0ahci(4) ca=
n use NCQ
> =A0 =A0 =A0 =A0of WD10EADS, but doesn't use NCQ of X25-E.
How useful is NCQ on an SSD? Isn't the primary thrust of NCQ to allow
the disk to reorder writes to optimize the seek pattern?
--=20
Against stupidity the very gods Themselves contend in vain.
Friedrich Schiller
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