Re: [Xen-users] 1000 Domains: Not able to access Domu via xm console from Dom0

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2012-12-06 at 23:27 +0000, Paul Harvey wrote:

> Any help, or is this a limitation of Xen?

One limit you might be hitting is the number of event channels which
dom0 can handle. The maximum is currently 1024 for a 32-bit domains and
4096 for 64-bit (that's per domains, not total in the system). Depending
on the configuration of the mini-os domains (e.g. number of devices etc)
you might be hitting this -- "lsevtchn 0" might give a clue if this is
happening (that tool is in /usr/lib/xen somewhere).

Work has just started on expanding these limits to ~32k and ~512k for
32- and 64-bit domains respectively, the hope is that this will be done
in time for 4.3. Look for posts from Wei Liu on xen-devel this week.

If you aren't hitting the evtchn limits then maybe you are hitting some
dom0 OS level limitation, i.e. a ulimit on the number of open file
descriptors which xenconsoled can have or some limit on the number of
pty's.

Ian.


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