[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git)
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git) |
Date: |
Mon, 11 Apr 2011 23:18:06 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2011-04-11 23:05, Luiz Capitulino wrote:
> 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,
I meant: is it even faster with unaccelerated userspace irqchip? I've
seen such effects with emulated NICs before.
> but just realized that qemu-kvm's configure says that I/O thread
> is disabled:
>
> IO thread no
>
> And it's fast..
That only means (so far) that the upstream io-thread code is disabled.
Qemu-kvm's own solution is enabled all the time, and you can't switch to
upstream anyway as both are incompatible. That's going to change soon
(hopefully) when we migrate qemu-kvm to the upstream version.
Jan
signature.asc
Description: OpenPGP digital signature
- [Qemu-devel] Re: Slow PXE boot in qemu.git (fast in qemu-kvm.git), (continued)
- [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, 2011/04/11
- Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git),
Jan Kiszka <=
- 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