linux-kernel - Re: QEMU fw_cfg DMA interface

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Message-ID: <CAJSP0QUT_Xguak6E0JtouCCaWQ3eV6bWJ=n6ORxnY2WGgi5GcQ@mail.gmail.com>
Date:	Thu, 6 Aug 2015 13:27:16 +0100
From:	Stefan Hajnoczi <stefanha@...il.com>
To:	Marc Marí <markmb@...hat.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>, seabios@...bios.org,
	Drew <drjones@...hat.com>, "Kevin O'Connor" <kevin@...onnor.net>,
	Gerd Hoffmann <kraxel@...hat.com>, Laszlo <lersek@...hat.com>
Subject: Re: QEMU fw_cfg DMA interface

On Thu, Aug 6, 2015 at 12:00 PM, Marc Marí <markmb@...hat.com> 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?

Stefan
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