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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 22:04:52 +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 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?
>
> 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
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- [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), Luiz Capitulino, 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), 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