Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755749AbbHFMk0 (ORCPT ); Thu, 6 Aug 2015 08:40:26 -0400 Received: from mail-oi0-f42.google.com ([209.85.218.42]:33437 "EHLO mail-oi0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755471AbbHFMkY convert rfc822-to-8bit (ORCPT ); Thu, 6 Aug 2015 08:40:24 -0400 MIME-Version: 1.0 In-Reply-To: <20150806143745.559f94fa@markmb_rh> References: <1438858816-29385-1-git-send-email-markmb@redhat.com> <20150806143745.559f94fa@markmb_rh> Date: Thu, 6 Aug 2015 13:40:24 +0100 Message-ID: Subject: Re: QEMU fw_cfg DMA interface From: Stefan Hajnoczi To: =?UTF-8?Q?Marc_Mar=C3=AD?= Cc: linux-kernel , qemu-devel , seabios@seabios.org, Drew , "Kevin O'Connor" , Gerd Hoffmann , Laszlo Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1463 Lines: 42 On Thu, Aug 6, 2015 at 1:37 PM, Marc Marí wrote: > On Thu, 6 Aug 2015 13:27:16 +0100 > Stefan Hajnoczi wrote: > >> On Thu, Aug 6, 2015 at 12:00 PM, Marc Marí 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). That's great. Since SeaBIOS is a default configuration, the remaining BIOS startup time is amenable to more optimizations in the future. Stefan -- 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/