From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luiz Capitulino Subject: Re: Slow PXE boot in qemu.git (fast in qemu-kvm.git) Date: Mon, 11 Apr 2011 16:15:55 -0300 Message-ID: <20110411161555.49688970@doriath> References: <20110408202525.26c45c05@doriath> <4D9FAD71.5020503@codemonkey.ws> <20110411153519.37f8316a@doriath> <1302548432.3589.78.camel@x201> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Anthony Liguori , qemu-devel@nongnu.org, kvm@vger.kernel.org, avi@redhat.com, mtosatti@redhat.com, mst@redhat.com, blauwirbel@gmail.com To: Alex Williamson Return-path: Received: from mx1.redhat.com ([209.132.183.28]:61141 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753466Ab1DKTQG (ORCPT ); Mon, 11 Apr 2011 15:16:06 -0400 In-Reply-To: <1302548432.3589.78.camel@x201> Sender: kvm-owner@vger.kernel.org List-ID: On Mon, 11 Apr 2011 13:00:32 -0600 Alex Williamson wrote: > On Mon, 2011-04-11 at 15:35 -0300, Luiz Capitulino wrote: > > On Fri, 08 Apr 2011 19:50:57 -0500 > > Anthony Liguori 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. So, does this have to be fixed w/o I/O thread?