Date: Thu, 17 Jan 2013 13:44:15 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Dieter BSD <dieterbsd@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: IBM blade server abysmal disk write performances Message-ID: <alpine.BSF.2.00.1301171343510.11758@wojtek.tensor.gdynia.pl> In-Reply-To: <CAA3ZYrB%2B4LU=YRQsvYB19sE9ywjejyP7Gc4j8fpTGx2LaZm4kw@mail.gmail.com> References: <CAA3ZYrB%2B4LU=YRQsvYB19sE9ywjejyP7Gc4j8fpTGx2LaZm4kw@mail.gmail.com>
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> > Note that the driver says "Command Queueing enabled" without > specifying which. If the driver is trying to use SATA's NCQ but > the drive only speaks SCSI's TCQ, that could explain it. Or if > the TCQ isn't working for some other reason. even without TCQ,NCQ and write cache the write speed is really terrible.
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