WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

RE: [Xen-devel] XEN 4.0.2-rc2 - using OCAML xenstored -- xend not starti

To: "'Ian Campbell'" <Ian.Campbell@xxxxxxxxxx>, "'Vincent Hanquez'" <vincent.hanquez@xxxxxxxxxxxxx>
Subject: RE: [Xen-devel] XEN 4.0.2-rc2 - using OCAML xenstored -- xend not starting?
From: "Yuvraj Agarwal" <yuvraj@xxxxxxxxxxx>
Date: Thu, 10 Feb 2011 09:53:26 -0800 (PST)
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Thu, 10 Feb 2011 09:54:04 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1297327365.28185.1198.camel@xxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <08f801cbc7b1$f59dcf10$e0d96d30$@cs.ucsd.edu> <4D524EB7.5040408@xxxxxxxxxxxxx> <1297327365.28185.1198.camel@xxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AQM3tVJA0uzYLxvq5d8Q/WDpF2GIlQG/CwlyAb3dMh6RB0KzwA==
Hi Ian and Vincent,

Thank you for your responses - There are several possible issues it seems:

** I actually have both /dev/xen/eventchn and /dev/xen/evtchn but no 
/dev/xen/gntdev currently?

root@EM:/home/yuvraj# ll /dev/xen/
total 0
drwxr-xr-x  2 root root     80 2011-02-10 09:18 ./
drwxr-xr-x 17 root root   6120 2011-02-10 09:18 ../
crw-r-----  1 root root 10, 63 2011-02-10 09:18 eventchn
crw-rw----  1 root root 10, 60 2011-02-10 09:18 evtchn
root@EM:/home/yuvraj#

** It also looks like the minor numbers are mixed up, for example /proc/misc 
shows minor number 63 also for vga_arbitrer? Not sure if that matters.

root@EM:/home/yuvraj# cat /proc/misc
< snip >
59 gntdev
60 evtchn
< snip >
63 vga_arbiter
root@EM:/home/yuvraj#

** I also tried to start xenstored without the daemonize flag as Vincent 
mentioned, and posted the results in a separate email, (re-posting it here).

root@EM:/home/yuvraj# strace -f /usr/bin/xenstored --no-fork

<snip>
open("/dev/xen/eventchn", O_RDWR)       = 6
open("/proc/xen/xsd_port", O_RDONLY)    = 7
read(7, "145", 20)                      = 3
close(7)                                = 0
open("/proc/xen/xsd_kva", O_RDWR)       = 7
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 7, 0) = 0x7f5bbd2ef000
close(7)                                = 0
ioctl(6, EVIOCGVERSION, 0x7fffd0cd3e30) = -1 ENOTTY (Inappropriate ioctl for 
device)
write(2, "Fatal error: exception Failure(\""..., 64Fatal error: exception 
Failure("ioctl bind_interdomain failed")
) = 64
exit_group(2)                           = ?

Is there a way I can fix (e.g. a patch I can apply) this on my end?  I can 
try it out and post the results back so that this makes it into the tree, 
and helps anyone else using the OCAML version of xenstored.

Thanks!
Yuvraj


-----Original Message-----
From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx]
Sent: Thursday, February 10, 2011 12:43 AM
To: Vincent Hanquez
Cc: Yuvraj Agarwal; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] XEN 4.0.2-rc2 - using OCAML xenstored -- xend not 
starting?

On Wed, 2011-02-09 at 08:22 +0000, Vincent Hanquez wrote:
> On 08/02/11 17:02, Yuvraj Agarwal wrote:
> > Hi All,
> >
> > I just tried a new installation of Ubuntu 10.04 (64bit) + Xen and am
> > having some trouble starting XEN. I am using the latest mercurial
> > checkout
> > (4.0.2-rc2) and the only change I made was to Config.mk to enable
> > building the OCAML version of xenstored. " CONFIG_OCAML_XENSTORED ?=
> > y". I am using the same kernel I built earlier for a similar Ubuntu
> > 10.04-64bit / Xen
> > 4.0.0 installation (version 2.6.32.12).  I would like to use the
> > OCAML version of xenstored since it is supposed to be much
> > better/faster when starting up a larger number of domUs.
> >
> > The system starts up, and I can see xend started up, but when I do
> > "xm list" or "xm info" I get an error message that xend has not started 
> > up?
> >
> > root@EM:/etc# xm list
> > Error: Unable to connect to xend: No such file or directory. Is xend
> > running?
> > root@EM:/etc#
> >
> > root@EM:/etc# ps -efw | grep xen
> > root        88     2  0 Feb07 ?        00:00:00 [xenwatch]
> > root        89     2  0 Feb07 ?        00:00:00 [xenbus]
> > root      6254     1  0 Feb07 ?        00:00:00 /usr/bin/python
> > /usr/sbin/xend start
> > root      6255  6254  0 Feb07 ?        00:00:17 /usr/bin/python
> > /usr/sbin/xend start
> > root      7043  5919  0 08:55 pts/2    00:00:00 grep --color=auto xen
> > root@EM:/etc#
> >
> > root@EM:/etc# uname -a
> > Linux EM 2.6.32.12 #11 SMP Fri Jun 18 20:52:17 PDT 2010 x86_64
> > GNU/Linux root@EM:/etc#
> >
> > I did check and found two difference with my earlier installation of
> > Xen
> > 4.0.0 with the same kernel (although with the standard xenstored).
> > 1. The xen 4.0 installation does show a "xenstored" process also
> > running in addition to these ones.
> > 2.  "xend" seems to be looking for a directory, "
> > /var/lib/xenstored" that doesn't seem to exist on my system?
> >
> > Any pointers to fix this issue?
>
> The reason xend died is that xenstored hasn't started (or something
> happened to it), you need to figure out why.
>
> You can start xenstored directly on the cmdline with the no daemonize
> flag, to see if the program stays running, and if not you'll see the
> reason why it dies.

Xen 4.0 appears to use oxenstored from
http://xenbits.xensource.com/ext/xen-ocaml-tools.hg (it only moved in-tree 
in the 4.1 dev cycle).

IIRC the ocaml evtchn bindings used to blow away the /dev/evtchn node and 
replace it with their own, with hardcoded major:minor or 10:61.
However that "61" is not really a static number and can vary depending on 
kernel version / configuration.

Judging from Yuvraj's debugging his evtchn node has ended up at minor 60.

Looks like http://xenbits.xensource.com/xen-unstable.hg?rev/e7b55cc5533a
needs porting to xen-ocaml-tools.hg.

Ian.



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel