From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alejandro Comisario Subject: Re: kvm cpu usage allocation Date: Thu, 20 Feb 2014 11:31:13 -0300 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 To: kvm@vger.kernel.org Return-path: Received: from mail-ie0-f174.google.com ([209.85.223.174]:34720 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753516AbaBTObe (ORCPT ); Thu, 20 Feb 2014 09:31:34 -0500 Received: by mail-ie0-f174.google.com with SMTP id as1so1285622iec.33 for ; Thu, 20 Feb 2014 06:31:33 -0800 (PST) In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: any help on this one ? thanks! @lejandrito On Wed, Feb 19, 2014 at 6:42 PM, Alejandro Comisario wrote: > Hi everyone. > We are having a private cloud with more than 1000 phy servers. > Each server has 128GB of RAM and 24 cores (2 heaxacores with HT > enabled), but the amount of vms running on those servers versus the > flavor (amount of CPU) made us use about 80 VCPUS. > > The questions are as follow. > > * is there a fine documentation of HOW kvm handles cpu allocation/pin > per vm in an scenario like this one ? > * is there also, a documentation that explains under a circumstance > where a VM needs more processing power, how priority is managed ? > * is there a way to define some kind of politics or rules to have > specific cpu pinning for specific vms ? > > So, well ... any extensive information to understand how KVM behaves > would be great! > Thanks as allways! > > ---------- > @lejandrito