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Date: Wed, 1 Mar 2006 11:39:46 +0200 (EET)
From: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua>
To: "Mikhail T." <mi@aldan.algebra.com>
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Cc: current@freebsd.org, sos@freebsd.org
Subject: Re: pitiful performance of an SATA150 drive
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Hello!

On Wed, 1 Mar 2006, Mikhail T. wrote:
> I installed a new 500Gb SATA drive into my 6.1 system and am greatly
> disappointed with its performance. Although straight reading is
> Ok at around 32Mb/s, the writing is never more than 7Mb/s (as reported
> by `systat 1 -vm' while running `cat < /dev/zero > /dev/ad8').

  This may give you terrible performance due to small (4 Kb) buffer size.
Try the following command instead: dd if=/dev/zero bs=1m of=/dev/ad8.


Sincerely, Dmitry
-- 
Atlantis ISP, System Administrator
e-mail:  dmitry@atlantis.dp.ua
nic-hdl: LYNX-RIPE