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Date: Mon, 11 Apr 2011 16:15:55 -0300
From: Luiz Capitulino <lcapitulino@redhat.com>
Message-ID: <20110411161555.49688970@doriath>
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Subject: Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git)
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To: Alex Williamson <alex.williamson@redhat.com>
Cc: kvm@vger.kernel.org, mst@redhat.com, mtosatti@redhat.com, qemu-devel@nongnu.org, blauwirbel@gmail.com, avi@redhat.com

On Mon, 11 Apr 2011 13:00:32 -0600
Alex Williamson <alex.williamson@redhat.com> wrote:

> On Mon, 2011-04-11 at 15:35 -0300, Luiz Capitulino wrote:
> > On Fri, 08 Apr 2011 19:50:57 -0500
> > Anthony Liguori <anthony@codemonkey.ws> wrote:
> > 
> > > On 04/08/2011 06:25 PM, Luiz Capitulino wrote:
> > > > Hi there,
> > > >
> > > > Summary:
> > > >
> > > >   - PXE boot in qemu.git (HEAD f124a41) is quite slow, more than 5 minutes. Got
> > > >     the problem with e1000, virtio and rtl8139. However, pcnet *works* (it's
> > > >     as fast as qemu-kvm.git)
> > > >
> > > >   - PXE boot in qemu-kvm.git (HEAD df85c051) is fast, less than a minute. Tried
> > > >     with e1000, virtio and rtl8139 (I don't remember if I tried with pcnet)
> > > >
> 
> I was having this problem too, but I think it's because I forgot to
> build qemu with --enable-io-thread, which is the default for qemu-kvm.
> Can you re-configure and build with that and see if it's fast?  Thanks,

Yes, nice catch, it's faster with I/O thread enabled, even seem faster
than qemu-kvm.git.

So, does this have to be fixed w/o I/O thread?