Date: Tue, 15 Dec 2009 10:41:27 +0100 From: Thomas Backman <serenity@exscape.org> To: Wes Peters <barnaclewes@gmail.com> Cc: FreeBSD current <freebsd-current@freebsd.org> Subject: Re: How do I use NCQ of Intel X25-E(SSD) on ahci(4)? Message-ID: <260900B2-1EC8-47F9-B3FE-144943ADEA70@exscape.org> In-Reply-To: <f83770800912150136u1fbabd2ak7b0cd15f85c0099f@mail.gmail.com> References: <20091119004651.7432a6e4.nork@FreeBSD.org> <f83770800912150136u1fbabd2ak7b0cd15f85c0099f@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Dec 15, 2009, at 10:36 AM, Wes Peters wrote: > On Wed, Nov 18, 2009 at 7:46 AM, Norikatsu Shigemura = <nork@freebsd.org> wrote: >> Hi Alexander! >>=20 >> I have a Intel 64GB SSD(X25-E) and a Western Digital Caviar = Green >> 1TB HDD (WD10EADS), and use them on ahci(4). ahci(4) can use = NCQ >> of WD10EADS, but doesn't use NCQ of X25-E. >=20 > 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? http://en.wikipedia.org/wiki/NCQ#NCQ_in_Solid-State_Drives :) Regards, Thmas=
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?260900B2-1EC8-47F9-B3FE-144943ADEA70>