Date: Mon, 16 Apr 2007 19:03:23 -0400 From: Kris Kennaway <kris@obsecurity.org> To: "Gelsema, P (Patrick)" <gelsemap@superhero.nl> Cc: freebsd-current@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: Difference between 6.2 and 7.0 Adaptec 39320D - 7.0 performing less Message-ID: <20070416230322.GA69661@xor.obsecurity.org> In-Reply-To: <200704162247.29909.gelsemap@superhero.nl> References: <200704162247.29909.gelsemap@superhero.nl>
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On Mon, Apr 16, 2007 at 10:47:24PM +0200, Gelsema, P (Patrick) wrote:
> Goodevening lists,
>=20
> I am toying with Freebsd 7 to see if it will and how it runs on my new As=
us=20
> M2N mainboard. One of the things I noticed is that when running=20
> 7.0-Current-200704 the throughput of the SCSI drive seems halved. When=20
> running 6.2 throughput is doubled/normal.
>=20
> Throughput is measured with the following command.
>=20
> dd if=3D/dev/zero of=3D/usr/test
> where /usr resides on da0s1f
>=20
> On 7.0 I get about 33MB/sec
> On 6.2 I get about 69Mb/sec
>=20
> I did not make any changes, installation is fresh from CD with Minimal as=
=20
> distribution.
Apparently you weren't paying attention during boot, because 7.0 ships
with heavy debugging options enabled, and tells you about it up front:
"WARNING: WITNESS option enabled, expect reduced performance.\n";
Recompile your kernel with debugging options disabled before making
performance comparisons.
Kris
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