From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [RFC] need to improve slot creation/destruction? -- Re: [RFC][PATCH] srcu: Implement call_srcu() Date: Tue, 14 Feb 2012 11:52:58 +0200 Message-ID: <4F3A2EFA.4090300@redhat.com> References: <4F27F0E6.1040309@redhat.com> <1328017807.2446.230.camel@twins> <20120131222447.GH2391@linux.vnet.ibm.com> <1328091749.2760.34.camel@laptop> <4F29178A.1090306@redhat.com> <4F2918D5.4050104@redhat.com> <20120201135020.GB18998@amt.cnet> <20120209004320.5772daa0472aef4700dab1b6@gmail.com> <20120208184531.GA19883@amt.cnet> <4F33D760.5070702@redhat.com> <20120210171623.GA24403@amt.cnet> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Takuya Yoshikawa , kvm@vger.kernel.org To: Marcelo Tosatti Return-path: Received: from mx1.redhat.com ([209.132.183.28]:50875 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759690Ab2BNJxB (ORCPT ); Tue, 14 Feb 2012 04:53:01 -0500 In-Reply-To: <20120210171623.GA24403@amt.cnet> Sender: kvm-owner@vger.kernel.org List-ID: On 02/10/2012 07:16 PM, Marcelo Tosatti wrote: > On Thu, Feb 09, 2012 at 04:25:36PM +0200, Avi Kivity wrote: > > On 02/08/2012 08:45 PM, Marcelo Tosatti wrote: > > > > BTW do we really need fast slot creation/destruction? > > > > > > At the moment yes. Boot a RHEL/Fedora installation disk (or any other > > > guest which uses SYSLINUX splash screen) and you will see. > > > > Another workload that suffers is Windows XP clearing the screen during boot. > > > > > That > > > particular case is a limitation of cirrus in QEMU, ideally it should be > > > optimized there. > > > > Why do you say that? > > There is no fundamental need to create/destroy the 0xa0000 VGA memory > slot repeatedly. If the guest writes to it, then the need exists. > But you are right that the aim should be decent performance > nevertheless. -- error compiling committee.c: too many arguments to function