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Date:      Sun, 20 Jan 2013 00:33:52 +0100 (CET)
From:      Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To:        Stefan Esser <se@freebsd.org>
Cc:        Karim Fodil-Lemelin <fodillemlinkarim@gmail.com>, freebsd-hackers@freebsd.org, gibbs@freebsd.org, scottl@freebsd.org, mjacob@freebsd.org
Subject:   Re: IBM blade server abysmal disk write performances
Message-ID:  <alpine.BSF.2.00.1301200033080.7875@wojtek.tensor.gdynia.pl>
In-Reply-To: <50FABB71.6050406@freebsd.org>
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>

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> to be enabled to get any speed-up from tagged commands. This was no
> risk with SCSI drives, since the cache did not make the drives lye

i see no correlation between interface type and possibility of lying about 
command completion.




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