On 2011-04-11 21:15, Luiz Capitulino wrote: > On Mon, 11 Apr 2011 13:00:32 -0600 > Alex Williamson <alex.williamson@xxxxxxxxxx> 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@xxxxxxxxxxxxx> 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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