Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932207AbbHFPbg (ORCPT ); Thu, 6 Aug 2015 11:31:36 -0400 Received: from mail-qk0-f179.google.com ([209.85.220.179]:36040 "EHLO mail-qk0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753450AbbHFPaq (ORCPT ); Thu, 6 Aug 2015 11:30:46 -0400 Date: Thu, 6 Aug 2015 11:30:43 -0400 From: "Kevin O'Connor" To: Marc =?iso-8859-1?Q?Mar=ED?= Cc: Stefan Hajnoczi , linux-kernel , qemu-devel , seabios@seabios.org, Drew , Gerd Hoffmann , Laszlo Subject: Re: QEMU fw_cfg DMA interface Message-ID: <20150806153043.GB9661@morn.localdomain> References: <1438858816-29385-1-git-send-email-markmb@redhat.com> <20150806143745.559f94fa@markmb_rh> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20150806143745.559f94fa@markmb_rh> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1488 Lines: 42 On Thu, Aug 06, 2015 at 02:37:45PM +0200, Marc Mar? wrote: > On Thu, 6 Aug 2015 13:27:16 +0100 > Stefan Hajnoczi wrote: > > > On Thu, Aug 6, 2015 at 12:00 PM, Marc Mar? wrote: > > > When running a Linux guest on top of QEMU, using the -kernel > > > options, this is the timing improvement for x86: > > > > > > QEMU commit 2be4f242b50a8 and SeaBIOS commit 908a58c1d5ff > > > QEMU startup time: .078 > > > BIOS startup time: .060 > > > Kernel setup time: .578 > > > Total time: .716 > > > > > > QEMU with this patch series and SeaBIOS with this patch series > > > QEMU startup time: .080 > > > BIOS startup time: .039 > > > Kernel setup time: .002 > > > Total time: .121 > > > > Impressive results! > > > > Is this a fully-featured QEMU build or did you disable things? > > > > Is this the default SeaBIOS build or did you disable things? > > > > This is the default QEMU configuration I get for my system. It's not a > fully-featured QEMU, but it has a lot of things enabled. SeaBIOS > has a default configuration (with debugging disabled). Thanks! What qemu command-line did you use during testing? Also, do you have a quick primer on how to use the kvm trace stuff to obtain timings? -Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/