From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dario Faggioli Subject: Re: CAP and performance problem Date: Thu, 6 Jun 2013 17:42:27 +0200 Message-ID: <1370533347.17802.8.camel@Solace> References: <519B3832.30608@di.unipmn.it> <1370451024.18519.190.camel@Solace> <1370452319.18519.197.camel@Solace> <51AF6FBD.9090007@di.unipmn.it> <1370507870.18519.224.camel@Solace> <51B04F0E.5040506@di.unipmn.it> <51B066CC.4060900@ts.fujitsu.com> <51B067F1.1010008@eu.citrix.com> <51B08606.9090105@di.unipmn.it> <51B08883.50003@ts.fujitsu.com> <51B094D1.9010806@di.unipmn.it> <1370527977.18519.275.camel@Solace> <51B0AA6A.7090704@di.unipmn.it> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============7697274858883335404==" Return-path: In-Reply-To: <51B0AA6A.7090704@di.unipmn.it> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Massimo Canonico Cc: George Dunlap , Juergen Gross , xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org --===============7697274858883335404== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-6UURbAx1G4QW8ygxUvWw" --=-6UURbAx1G4QW8ygxUvWw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On gio, 2013-06-06 at 17:27 +0200, Massimo Canonico wrote: > Actually it seems that the problem is related to a BIOS setting. In my= =20 > HP server, there were a parameter called "HP power regulator" that I set= =20 > to "HP Static High-performance power" (before it was set to "dynamic=20 > performance power") and now I get what it is expected: cap 50% make my= =20 > application twice longer than when cap is 100%. >=20 Cool! :-) > Thanks to all of you guys. I think that this should be reported in the= =20 > doc where the cap mechanism is explained. >=20 Well, yes, I guess we can put there something like the following: "Beware of bugous BIOSes, providing obscure options with fancy names, promising to solve world hunger and all the other nasty problems out there if you check them, while all they do is just messing up with your OS power management strategies (for your ease and convenience)" :-D :-D Jokes apart, we may want to add a line there, perhaps on the Wiki, but I honestly don't think this is by any means the cap mechanism's. :-) Glad you have it working... I guess that means you can stay on Xen, right? :-P Regards, Dario --=20 <> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) --=-6UURbAx1G4QW8ygxUvWw Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (GNU/Linux) iEYEABECAAYFAlGwreMACgkQk4XaBE3IOsR/TwCfZTHWMRQdTlAMb3ORvlx4dfdY nGkAn3H4KSlNzkXZMwga8DJhKTxT/uZv =mFPz -----END PGP SIGNATURE----- --=-6UURbAx1G4QW8ygxUvWw-- --===============7697274858883335404== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============7697274858883335404==--