Xen devel - Jul 2009 - ''xm create'' creates domains without a valid console tty

I''ve noticed that after I create 83 domains on a server, ''xm
create''
will create domains without a valid console tty value.

This corresponds approx. to 256 file descriptors. I''ve bumped up the  
limits for all daemon processes to 1500 file descriptors,
so I''m really puzzled where xen is hitting a resource limit.

Where is the code that creates the xs entries for a newly created  
domain??

Here''s a partial xs dump from a working domain:

console = ""
    ring-ref = "6761587"
    port = "2"
    limit = "1048576"
    type = "xenconsoled"
    tty = "/dev/ttyta"
name = "netbsd.072"
domid = "74"
cpu = ""
    0 = ""
      availability = "online"
store = ""
    ring-ref = "6761588"
    port = "1"
serial = ""
    0 = ""
     tty = "/dev/ttyta"

Here''s a dump from a broken domain:

console = ""
    ring-ref = "8205145"
    port = "2"
    limit = "1048576"
    type = "xenconsoled"
name = "netbsd.082"
domid = "84"
cpu = ""
    0 = ""
     availability = "online"
store = ""
    ring-ref = "8205146"
    port = "1"


Any ideas?

Thanks,

Joe


Joe McGuckin



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I''ve noticed that after I create 83 domains on a server, ''xm
create''
will create domains without a valid console tty value.

This corresponds approx. to 256 file descriptors. I''ve bumped up the  
limits for all daemon processes to 1500 file descriptors,
so I''m really puzzled where xen is hitting a resource limit.

Where is the code that creates the xs entries for a newly created  
domain??

Here''s a partial xs dump from a working domain:

console = ""
   ring-ref = "6761587"
   port = "2"
   limit = "1048576"
   type = "xenconsoled"
   tty = "/dev/ttyta"
name = "netbsd.072"
domid = "74"
cpu = ""
   0 = ""
     availability = "online"
store = ""
   ring-ref = "6761588"
   port = "1"
serial = ""
   0 = ""
    tty = "/dev/ttyta"

Here''s a dump from a broken domain:

console = ""
   ring-ref = "8205145"
   port = "2"
   limit = "1048576"
   type = "xenconsoled"
name = "netbsd.082"
domid = "84"
cpu = ""
   0 = ""
    availability = "online"
store = ""
   ring-ref = "8205146"
   port = "1"


Any ideas?

Thanks,

Joe


Joe McGuckin




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

On 02/07/2009 21:42, "joe mcguckin" <joe@via.net> wrote:
> I''ve noticed that after I create 83 domains on a server,
''xm create''
> will create domains without a valid console tty value.
> 
> This corresponds approx. to 256 file descriptors. I''ve bumped up
the
> limits for all daemon processes to 1500 file descriptors,
> so I''m really puzzled where xen is hitting a resource limit.
> 
> Where is the code that creates the xs entries for a newly created
> domain??
The missing tty nodes would be written by xenconsoled. See code in
tools/console/daemon/io.c:domain_create_tty(). Is the console daemon still
alive when this problem occurs (e.g., do other guest consoles continue to
work)?

You could try running xenconsoled with the -I command-line option. Then it
will not daemonize and you will see any error messages on stderr.

 -- Keir



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