RE: XEN 4.0.2-rc2 - using OCAML xenstored -- xend not starting?

["Yuvraj Agarwal" <yuvraj@cs.ucsd.edu>]

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Hi All, 

 

I did some further debugging and am attaching some more information here.
Any help is appreciated of course. Out of curiosity, are we amongst the
few people who are trying to use the OCAML version of xenstored?  

If I change the Config.mk to disable building the OCAML version of
xenstored xend starts up and I can do "xm info" and everything works fine.


 

If I build the OCAML version of xenstored instead, I get the "xend is not
started error" even though I see two xend processes. 

Furthermore, if I run the OCAML xentored with an strace, I get the
following error: 

 

"strace -f /usr/bin/xenstored --no-fork" 

 

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) = 0x7f2a4f682000

close(7)                                = 0

ioctl(6, EVIOCGVERSION, 0x7fff86ad7320) = -1 ENOTTY (Inappropriate ioctl
for device)

write(2, "Fatal error: exception Failure(\""..., 64Fatal error: exception
Failure("ioctl bind_interdomain failed")

) = 64

exit_group(2)                           = ?

 

thanks

Yuvraj 

 

 

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Yuvraj Agarwal
Sent: Wednesday, February 09, 2011 10:26 AM
To: xen-devel@lists.xensource.com
Cc: Asim
Subject: RE: [Xen-devel] XEN 4.0.2-rc2 - using OCAML xenstored -- xend not
starting? 

 

I did some more debugging and based on some of the instructions on
http://wiki.xen.org/xenwiki/XenParavirtOps I found out that I may have
been missing the "gntdev" module. 

I rebuilt the kernel and added that in (part of the kernel rather than as
a separate module), but still have the same issues. Adding some more
debugging information: 

 

root@nor:/home/yuvraj# cat /proc/misc 

 54 network_throughput

55 network_latency

56 cpu_dma_latency

57 device-mapper

221 mpt2ctl

144 nvram

228 hpet

58 blktap-control

59 gntdev   

 60 evtchn   

 61 autofs

231 snapshot

184 microcode

227 mcelog

62 rfkill

63 vga_arbiter


root@nor:/home/yuvraj# ll /dev/xen/   

total 0

drwxr-xr-x  2 root root     80 2011-02-08 22:07 ./

drwxr-xr-x 17 root root   6120 2011-02-08 22:07 ../

crw-r-----  1 root root 10, 63 2011-02-08 22:07 eventchn

crw-rw----  1 root root 10, 60 2011-02-08 22:07 evtchn

root@nor:/home/yuvraj#

 

Seems like I am missing the /dev/xen/gntdev entries?  Shouldn't these be
created automatically? 

Thanks

Yuvraj

 

-----Original Message-----
From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Yuvraj Agarwal
Sent: Tuesday, February 08, 2011 9:02 AM
To: xen-devel@lists.xensource.com
Subject: [Xen-devel] XEN 4.0.2-rc2 - using OCAML xenstored -- xend not
starting? 

 

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? 

 

Thanks!

Yuvraj 

 

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