Date: Sun, 17 Oct 2004 23:44:10 +0100
From: Alexander Clouter <alex-kernel@digriz.org.uk>
To: Con Kolivas <kernel@kolivas.org>
Cc: venkatesh.pallipadi@intel.com, cpufreq@www.linux.org.uk,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cpufreq_ondemand
Message-ID: <20041017224410.GA30611@inskipp.digriz.org.uk>
References: <20041017222916.GA30841@inskipp.digriz.org.uk> <4172F3C5.8090604@kolivas.org>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="k1lZvvs/B4yU6o8G"
Content-Disposition: inline
In-Reply-To: <4172F3C5.8090604@kolivas.org>
User-Agent: Mutt/1.5.6+20040907i
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1899
Lines: 64


--k1lZvvs/B4yU6o8G
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Oct 18, Con Kolivas wrote:
>=20
> I'd much prefer it shot up to 100% or else every time the cpu usage went=
=20
> up there'd be an obvious lag till the machine ran at it's capable speed.=
=20
>  I very much doubt the small amount of time it spent at 100% speed with=
=20
> the default design would decrease the battery life significantly as well.
>=20
The issue I found was that if you are running a process that is io bound, f=
or
example, then you may never need to run your cpu at 100%, it will speed up
bit by bit[1] till it gets to a speed that is fast enough to to deal with it
without max'ing the cpufreq.

This is after all exactly want most (if not all) the userspace daemons try =
to=20
do anyway.

Cheers

Alex

[1] also you might find that the task does not last long enough to warrant=
=20
	jumping and lurking at 100% speed anyway

--=20
 _________________________________________=20
/ It's always darkest just before it gets \
\ pitch black.                            /
 -----------------------------------------=20
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

--k1lZvvs/B4yU6o8G
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.5 (GNU/Linux)

iD8DBQFBcvW6Nv5Ugh/sRBYRAmHRAJ4/MBihgzwxTRHYQ6m2iGToq2qWlgCgiFzz
v7vob5jvig48p3dbHFR9+Dk=
=42EQ
-----END PGP SIGNATURE-----

--k1lZvvs/B4yU6o8G--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/