From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dario Faggioli Subject: Re: [PATCH v3 for Xen 4.6 1/4] xen: enable per-VCPU parameter settings for RTDS scheduler Date: Fri, 10 Jul 2015 11:51:03 +0200 Message-ID: <1436521863.22672.350.camel@citrix.com> References: <1435545899-22751-1-git-send-email-chong.li@wustl.edu> <1435545899-22751-2-git-send-email-chong.li@wustl.edu> <559BB101020000780008D371@mail.emea.novell.com> <1436279944.22672.104.camel@citrix.com> <1436344434.22672.186.camel@citrix.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6843582787287488159==" Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Meng Xu Cc: Chong Li , Sisu Xi , George Dunlap , "xen-devel@lists.xen.org" , Meng Xu , Jan Beulich , Chong Li , Dagaen Golomb List-Id: xen-devel@lists.xenproject.org --===============6843582787287488159== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-vs2l/m4e/TSJievjjQT+" --=-vs2l/m4e/TSJievjjQT+ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2015-07-08 at 18:16 -0700, Meng Xu wrote: > 2015-07-08 1:33 GMT-07:00 Dario Faggioli : > > Well, wouldn't the above reasoning about overhead apply here too? > > Budgets of 5us mean the scheduler can be invoked every 5us for budget > > enforcement. If 10us was unreasonable, 5 is even more so. > > > > Therefore, 100us here too? Or maybe let's allow for lower values (like > > 50us or 10us), but print a warning? >=20 > Right. we can use 100us as a threadhold for budget too. Maybe printing > warning is a better idea? > If users know what they are doing and expecting, it is ok. But too > small value (<1us) will potentially cause system freeze. >=20 I'd be ok with printing a warning for vales below 100us, and rejecting values below 1us, or even below 10us (I don't think it would be that practical to go below that anyway). Regards, Dario --=20 <> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) --=-vs2l/m4e/TSJievjjQT+ 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 v2 iEYEABECAAYFAlWflY8ACgkQk4XaBE3IOsTLPgCfWNcscYpn3a2dDehJGZfK+5UP sAwAn3WTSkxfAJZ8RyNcbdd3foDxz7hh =rsUx -----END PGP SIGNATURE----- --=-vs2l/m4e/TSJievjjQT+-- --===============6843582787287488159== 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 --===============6843582787287488159==--