From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:56859) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q9SYG-0003QG-Gu for qemu-devel@nongnu.org; Mon, 11 Apr 2011 21:38:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Q9NLw-0006WR-Kx for qemu-devel@nongnu.org; Mon, 11 Apr 2011 16:04:54 -0400 Received: from fmmailgate03.web.de ([217.72.192.234]:59913) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q9NLw-0006Tu-6b for qemu-devel@nongnu.org; Mon, 11 Apr 2011 16:04:52 -0400 Message-ID: <4DA35EE4.6090303@web.de> Date: Mon, 11 Apr 2011 22:04:52 +0200 From: Jan Kiszka MIME-Version: 1.0 References: <20110408202525.26c45c05@doriath> <4D9FAD71.5020503@codemonkey.ws> <20110411153519.37f8316a@doriath> <1302548432.3589.78.camel@x201> <20110411161555.49688970@doriath> In-Reply-To: <20110411161555.49688970@doriath> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig6C4549625DFADD40E1B691EC" Sender: jan.kiszka@web.de Subject: Re: [Qemu-devel] Slow PXE boot in qemu.git (fast in qemu-kvm.git) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Luiz Capitulino Cc: kvm@vger.kernel.org, mst@redhat.com, mtosatti@redhat.com, qemu-devel@nongnu.org, blauwirbel@gmail.com, Alex Williamson , avi@redhat.com This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig6C4549625DFADD40E1B691EC Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 2011-04-11 21:15, Luiz Capitulino wrote: > On Mon, 11 Apr 2011 13:00:32 -0600 > Alex Williamson wrote: >=20 >> 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 *wor= ks* (it's >>>>> as fast as qemu-kvm.git) >>>>> >>>>> - PXE boot in qemu-kvm.git (HEAD df85c051) is fast, less than a m= inute. Tried >>>>> with e1000, virtio and rtl8139 (I don't remember if I tried wit= h 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= , >=20 > 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? >=20 > 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 --------------enig6C4549625DFADD40E1B691EC Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.15 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org/ iEYEARECAAYFAk2jXuQACgkQitSsb3rl5xQgtwCeI5C6aunGuhIABXRofdvu9l1I b88AoOA2ihxeW5P4Ito14JB1vKTHUsbF =EuZc -----END PGP SIGNATURE----- --------------enig6C4549625DFADD40E1B691EC--