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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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