From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([140.186.70.92]:51725)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <alex.williamson@redhat.com>) id 1QAjpv-0005Fc-LM
	for qemu-devel@nongnu.org; Fri, 15 Apr 2011 10:17:29 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <alex.williamson@redhat.com>) id 1QAjpt-00057E-Vd
	for qemu-devel@nongnu.org; Fri, 15 Apr 2011 10:17:27 -0400
Received: from mx1.redhat.com ([209.132.183.28]:30310)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <alex.williamson@redhat.com>) id 1QAjpt-00056z-NG
	for qemu-devel@nongnu.org; Fri, 15 Apr 2011 10:17:25 -0400
From: Alex Williamson <alex.williamson@redhat.com>
In-Reply-To: <4DA6B0E8.2050608@msgid.tls.msk.ru>
References: <4DA6B0E8.2050608@msgid.tls.msk.ru>
Content-Type: text/plain; charset="UTF-8"
Date: Fri, 15 Apr 2011 08:17:21 -0600
Message-ID: <1302877041.3110.26.camel@x201>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] is it just me or is ne2k broken in qemu?
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <http://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Michael Tokarev <mjt@tls.msk.ru>
Cc: qemu-devel <qemu-devel@nongnu.org>

On Thu, 2011-04-14 at 12:31 +0400, Michael Tokarev wrote:
> I performed several tests of various emulated NICs
> booting with iPXE, and discovered that ne2k_pci (*)
> emulated device does not quite work, for quite some
> time already, at least with linux guests.
> 
> The NIC works for a while, but after a few packets,
> or a few 1000s of packets, it stalls.  In tcpdump
> on the host I see many ARP requests coming from the
> guest and each has corresponding ARP reply, but
> nothing is actually reaching the guest.
> 
> This behavour is consistent since qemu-kvm 0.12,
> and is demonstrated by guest kernel 2.6.32 and
> 2.6.38, either 32 or 64bit.
> 
> Anyone seen something similar?

For testing the iPXE ROMs I booted up each NIC, including ne2k_pci, to a
network loaded kernel (~4M) and installation initrd (~8M).  I stopped
the test at the point where the installer kernel was able to
successfully DHCP with the boot NIC.  ne2k_pci was definitely the
slowest of the cards at loading the images, but I didn't notice any
functionality issues.  Maybe I didn't let it run long enough, but the
boot ROM seems ok with it.

Alex