Subject: Re: 2.6.30-rc1 A few issues and a stall
From: Lin Ming <ming.m.lin@intel.com>
To: Ed Tomlinson <edt@aei.ca>
Cc: Zhang Rui <rui.zhang@intel.com>, LKML <linux-kernel@vger.kernel.org>,
       Avi Kivity <avi@redhat.com>,
       "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
       "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>
In-Reply-To: <1239588307.7661.209.camel@rzhang-dt>
References: <200904121124.07193.edt@aei.ca>
	 <1239588307.7661.209.camel@rzhang-dt>
Content-Type: text/plain
Date: Mon, 13 Apr 2009 10:50:31 +0800
Message-Id: <1239591031.4445.4091.camel@minggr.sh.intel.com>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 2779
Lines: 62

On Mon, 2009-04-13 at 10:05 +0800, Zhang Rui wrote:
> On Sun, 2009-04-12 at 23:24 +0800, Ed Tomlinson wrote:
> > Hi,
> > 
> > I got tired of building out of tree DRM drivers so decided to try 2.6.30-rc1.  For simple tasks
> > it works fine, for slightly more complex ones it is not quite as good...
> > 
> > Here is an example.  I normally start a kvm session with the commands below:
> > 
> > ed@grover ~/vm $ sudo modprobe tun
> > ed@grover ~/vm $ sudo brctl addbr br0
> > ed@grover ~/vm $ sudo ifconfig br0 192.168.100.254 netmask 255.255.255.0 up
> > ed@grover ~/vm $ sudo tunctl -b -u ed -t qtap0
> > qtap0
> > ed@grover ~/vm $ sudo brctl addif br0 qtap0
> > ed@grover ~/vm $ sudo ifconfig qtap0 up 0.0.0.0 promisc
> > ed@grover ~/vm $ sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
> > iptables v1.4.2: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)
> > Perhaps iptables or your kernel needs to be upgraded.
> > 
> > Issue 1 - I need to manually modprobe be get iptables to work.  This exact procedure worked in 2.6.29.
> > 
> > ed@grover ~/vm $ sudo modprobe nf_nat
> > ed@grover ~/vm $ sudo modprobe ipt_MASQUERADE
> > ed@grover ~/vm $ sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
> > 
> > Once the above networking stuff is setup I start kvm with the command below
> > 
> > QEMU_AUDIO_DRV=alsa kvm -m 1024 -cdrom /mnt/sdc4/divx/archlinux-2009.02-ftp-i686.iso -boot c -smp 3 -usb -usbdevice tablet -vga std -drive file=arch.img -net nic,macaddr=52:54:00:12:34:23 -net tap,ifname=qtap0,script=no -soundhw all -mem-path /hugepages
> > 
> > which works and the kvm session boots just fine.  
> > 
> > Issue 2.  When I attempt to ping outside the kvm session the pc (not just the kvm session) hangs.
> > Its impossible to kill the kvm session and there are numerious info messages from RCU (tree RCU enabled)
> > about stalls.  
> > 
> > Issue 3.  ACPI is having fun during startup.  This does not seem to cause problems later but is 
> > noisy and probably should be fixed before .30's release.
> > 
> this is a duplicate of bug
> http://bugzilla.kernel.org/show_bug.cgi?id=13036
> please try the patch in comment #6 there and see if it helps.

please also have a try the patch in comment #10 (don't apply the patch
in comment #6).

Thanks.

> 
> thanks,
> rui
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/