Re: [Xen-users] PV guests concurrent running limit

[Sarah Newman <srn@xxxxxxxxx>]

On 09/06/2016 06:29 AM, Andrey Schmiegelow wrote:
> Hello everybody.
> 
> After a lot of experiences with others kernels and it's parameters I found a 
> workaround.
> Removing the parameter "console=XXX " from the kernel line a new PV guest 
> deploys (beyond the others 50 PV guests already running with this parameter).
> Of course, after that I can't access this new guests through xl console 
> command.
> 
> Until now this problem seems to happen only with PV guests while I have no 
> problems deploying more HVM guests.
> 
> This workaround if fine for my current purpose, but it will be interesting 
> understand why this happen.
> 
> I will back if I have any news.
> Thank you for all you help me.

I believe that adding extra consoles will fail if the maximum number of open 
files available to xenconsoled is too low. There might be a distribution
specific way to increase it. You can look in /proc/<pid>/limits for the current 
value. That number can be adjusted dynamically with prlimit with a new
enough kernel, or you can increase the allowed amount in 
/etc/security/limits.conf and restart xenconsoled.

To my best knowledge, the reason you're seeing a problem with PV and not HVM 
domains is that (assuming you're not using stubdomains) qemu opens a pts
directly rather than going through xenconsoled.

--Sarah

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
https://lists.xen.org/xen-users