Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git)

[Luiz Capitulino]

On Mon, 11 Apr 2011 13:00:32 -0600
Alex Williamson <address@hidden> wrote:

> On Mon, 2011-04-11 at 15:35 -0300, Luiz Capitulino wrote:
> > On Fri, 08 Apr 2011 19:50:57 -0500
> > Anthony Liguori <address@hidden> 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?