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Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git)
From: |
Luiz Capitulino |
Subject: |
Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git) |
Date: |
Mon, 11 Apr 2011 18:05:23 -0300 |
On Mon, 11 Apr 2011 22:04:52 +0200
Jan Kiszka <address@hidden> wrote:
> On 2011-04-11 21:15, Luiz Capitulino wrote:
> > 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.
>
> What's the performance under qemu-kvm with -no-kvm-irqchip?
Still fast, but just realized that qemu-kvm's configure says that I/O thread
is disabled:
IO thread no
And it's fast..
>
> >
> > So, does this have to be fixed w/o I/O thread?
>
> If it's most probably an architectural deficit of non-io-thread mode, I
> would say let it rest in peace. But maybe it points to a generic issues
> that is just magnified by non-threaded mode.
>
> Jan
>
- [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Luiz Capitulino, 2011/04/08
- [Qemu-devel] Re: Slow PXE boot in qemu.git (fast in qemu-kvm.git), Anthony Liguori, 2011/04/08
- [Qemu-devel] Re: Slow PXE boot in qemu.git (fast in qemu-kvm.git), Stefan Hajnoczi, 2011/04/09
- [Qemu-devel] Re: Slow PXE boot in qemu.git (fast in qemu-kvm.git), Avi Kivity, 2011/04/10
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Luiz Capitulino, 2011/04/12
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Alex Williamson, 2011/04/11
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Luiz Capitulino, 2011/04/11
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Jan Kiszka, 2011/04/12
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Anthony Liguori, 2011/04/11
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Avi Kivity, 2011/04/12
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git),
Luiz Capitulino <=
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Jan Kiszka, 2011/04/11
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Alex Williamson, 2011/04/11
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Jan Kiszka, 2011/04/11
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Jan Kiszka, 2011/04/11
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git), Paolo Bonzini, 2011/04/12
[Qemu-devel] Re: Slow PXE boot in qemu.git (fast in qemu-kvm.git), Blue Swirl, 2011/04/09