Re: Linux 3.0-rc1 - what Xen components went in.

[Stephan Seitz <stse+xen@fsing.rootsland.net>]

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On Thu, Jun 16, 2011 at 11:07:06AM -0400, Konrad Rzeszutek Wilk wrote:
>On Thu, Jun 16, 2011 at 11:48:20AM +0200, Stephan Seitz wrote:
>> The 3.0-rc2 compiled and started without problems, even the DomU
>> started.  But when I looked at the DomU console I noticed that the
>> system had problems with the filesystems. ext3 and ext4 partitions
>> produced journal errors and got mounted read only.
>Hmm, are barriers somehow being turned on? (They shouldn't). It would
>be helpfull if you included the error logs.

At least with 2.6.36.4-DomU barriers seems to be enabled:
blkfront: xvda1: barriers enabled (tag)
blkfront: xvda2: barriers enabled (tag)
blkfront: xvda5: barriers enabled (tag)
blkfront: xvda6: barriers enabled (tag)
blkfront: xvda7: barriers enabled (tag)
blkfront: xvda8: barriers enabled (tag)

xvda1 is ext3 (root fs) with the mount option barrier=1, but this doesn’t 
seem to work (EXT3-fs: barriers not enabled). The other filesystems are 
ext4 without explicit barrier options and don’t have log output 
concerning barriers.

For now I can’t make tests since I’m not at home for the next days. Then 
I will try to get logs as well. Since the filesystems are changed to read 
only, the logs are not written to disk, so I have to use other methods.

>I don't try to put disks as partitions. Let me try that. Are the sizes
>that xne-blkfront report the same?

xen-blkfront? Is this a program or kernel output? Dom0 or DomU?

>Ah, hadn't tried LUKS. What happens if they are _not_ on LUKS?

For now I can’t try it. Besides /boot in Dom0 all my partitions are LUKS 
encrypted.

>> The DomU kernel is a 2.6.36.4 vanilla kernel. I noticed that I can’t
>> use a newer kernel. Every kernel > 2.6.36 crashes the DomU
>> immediatley (I don’t even get a console). The log said that DomU was
>> crashing too fast, so it was disabled to avoid loops. This happens
>> with 2.6.34.8 as Dom0 kernel and with 3.0-rc2.
>Can you boot it with 'earlyprintk=xenboot debug loglevel=10' please?

Is this a boot option I pass to the DomU kernel? I will do the test next 
week.

>Are you using a special version of .config? Is it available somewhere?

http://fsing.rootsland.net/~stse/config-2.6.38.3-DomU (not working)
http://fsing.rootsland.net/~stse/config-2.6.36.4-DomU (working)

Thanks for your help.

Shade and sweet water!

	Stephan

-- 
| Stephan Seitz             E-Mail: stse@fsing.rootsland.net |
| PGP Public Keys: http://fsing.rootsland.net/~stse/pgp.html |

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