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Message-ID: <20150806153043.GB9661@morn.localdomain>
Date: Thu, 6 Aug 2015 11:30:43 -0400
From: Kevin O'Connor <kevin@...onnor.net>
To: Marc Marí <markmb@...hat.com>
Cc: Stefan Hajnoczi <stefanha@...il.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
qemu-devel <qemu-devel@...gnu.org>, seabios@...bios.org,
Drew <drjones@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>,
Laszlo <lersek@...hat.com>
Subject: Re: QEMU fw_cfg DMA interface
On Thu, Aug 06, 2015 at 02:37:45PM +0200, Marc Marí wrote:
> On Thu, 6 Aug 2015 13:27:16 +0100
> Stefan Hajnoczi <stefanha@...il.com> wrote:
>
> > 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?
> >
>
> 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
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