On 04/11/2011 03:04 PM, Jan Kiszka wrote:
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.
If gpxe is spinning waiting for I/O to complete, that's going to prevent
select from running until the next signal (timer event).
Regards,
Anthony Liguori
Jan
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