Skip site navigation (1)Skip section navigation (2)
Date:      Sat, 6 Mar 2010 16:35:36 +1030
From:      "Daniel O'Connor" <doconnor@gsoft.com.au>
To:        freebsd-hackers@freebsd.org
Cc:        Kevin Day <toasty@dragondata.com>
Subject:   Re: ACPI/power implementation causing performance loss with i7/Nehalem turbo boost
Message-ID:  <201003061635.44684.doconnor@gsoft.com.au>
In-Reply-To: <0ECDEB94-E60E-45C7-98AC-5E948DE4649C@dragondata.com>
References:  <0ECDEB94-E60E-45C7-98AC-5E948DE4649C@dragondata.com>

next in thread | previous in thread | raw e-mail | index | archive | help
--nextPart19212338.WHq44byRUD
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

On Sat, 6 Mar 2010, Kevin Day wrote:
> So, it seems that the VMware hypervisor is deactivating cores on the
> CPU when idle, but FreeBSD itself isn't. Is anyone working on giving
> FreeBSD's idle loop/scheduler the ability to go into deeper sleep
> states? It seems this would have more than just a power savings
> benefit now.

What does "sysctl dev.cpu.0.cx_lowest" say?
And "sysctl dev.cpu.$N.cx_supported" ?

ISTR FreeBSD defaults to a very conservative setting here so you may=20
have to set it manually.

=2D-=20
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C

--nextPart19212338.WHq44byRUD
Content-Type: application/pgp-signature; name=signature.asc 
Content-Description: This is a digitally signed message part.

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.12 (FreeBSD)

iD8DBQBLkfC45ZPcIHs/zowRAht4AJ95NQzWrtVeTAWpT8mFEBGiNAso5gCgqo30
SkOQZS5P4gPjKhansG61weM=
=zGyk
-----END PGP SIGNATURE-----

--nextPart19212338.WHq44byRUD--



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201003061635.44684.doconnor>