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Date: Fri, 10 Jun 2005 10:49:46 +0400
From: Dmitry Mityugov <dmitry.mityugov@gmail.com>
To: "scuba@centroin.com.br" <scuba@centroin.com.br>
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Cc: freebsd-questions@freebsd.org
Subject: Re: mismatch results with disk performance
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On 6/9/05, scuba@centroin.com.br <scuba@centroin.com.br> wrote:
> Dmitry,
>=20
>         Both situations have the same result, an Slave IDE HDD on primary
> controller, or a master HDD on the 2nd IDE controler, works much more
> slow, testing with 'dd'.
>         I couldn't see that with diskinfo.

I can't reproduce this. On a dual Xeon server with 2 PATA Seagate
disks attached as masters to both IDE channels and a PATA CD-ROM as a
slave on the 1st channel, reading them with dd procuces this:

%dd if=3D/dev/ad0 of=3D/dev/null bs=3D1m count=3D20
20+0 records in
20+0 records out
20971520 bytes transferred in 0.378772 secs (55367171 bytes/secs)
%dd if=3D/dev/ad2 of=3D/dev/null bs=3D1m count=3D20
20+0 records in
20+0 records out
20971520 bytes transferred in 0.364243 secs (57575625 bytes/secs)

Please let me know if there is anything else I shall try to reproduce
the problem.

--=20
Dmitry

"We live less by imagination than despite it" - Rockwell Kent, "N by E"