Date: Mon, 21 Jan 2013 12:14:41 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Scott Long <scott4long@yahoo.com> Cc: Karim Fodil-Lemelin <fodillemlinkarim@gmail.com>, "freebsd-hackers@freebsd.org Hackers" <freebsd-hackers@freebsd.org>, "gibbs@FreeBSD.org Gibbs" <gibbs@freebsd.org>, "mjacob@FreeBSD.org Jacob" <mjacob@freebsd.org> Subject: Re: IBM blade server abysmal disk write performances Message-ID: <alpine.BSF.2.00.1301211214100.9447@wojtek.tensor.gdynia.pl> In-Reply-To: <F19EEB9B-4AA5-447A-A684-597AD214CC3A@yahoo.com> References: <CAA3ZYrBV9f%2BcHx4jvS0UKTr%2Bp7eNUBA0S2%2Bv9oZAHqwm9VBOWw@mail.gmail.com> <6C0B86E6-195C-4D35-AE40-3D2F9F6D28FB@yahoo.com> <alpine.BSF.2.00.1301182217590.1478@wojtek.tensor.gdynia.pl> <1358544287.32417.251.camel@revolution.hippie.lan> <50F9CFEB.5060302@feral.com> <50F9DB9A.9050303@gmail.com> <50FABB71.6050406@freebsd.org> <alpine.BSF.2.00.1301200033080.7875@wojtek.tensor.gdynia.pl> <F19EEB9B-4AA5-447A-A684-597AD214CC3A@yahoo.com>
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> With SATA vs SAS, the gap is much narrower. The TCQ command set > (still used by SAS) is still better than the NCQ command set, but the in what point TCQ is exactly better than SATA NCQ.
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