RE: Xenstore quota and driver domains

[Paul Durrant <xadimgnik@xxxxxxxxx>]

> -----Original Message-----
> From: Jürgen Groß <jgross@xxxxxxxx>
> Sent: 04 June 2020 09:11
> To: paul@xxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: Xenstore quota and driver domains
> 
> On 04.06.20 10:07, Paul Durrant wrote:
> >> -----Original Message-----
> >> From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of 
> >> Jürgen Groß
> >> Sent: 04 June 2020 06:03
> >> To: xen-devel@xxxxxxxxxxxxxxxxxxxx
> >> Subject: Xenstore quota and driver domains
> >>
> >> A recent report on xen-users surfaced a problem we have with driver
> >> domains in medium sized or large configuration: the driver domain can
> >> easily hit the default Xenstore quota (in the report it was a driver
> >> domain for disks which hit the quota when 15 domUs were active at the
> >> same time).
> >
> > Which quota is hit? Node or watch?
> 
> Node.
> 

Ok. Since each individual backend is going to watch at least its frontend's 
'state' node then a watch quota of 128 is still probably going to be 
restrictive for a global driver domain so this ought to be settable on a 
per-domain basis as well as the node quota.

  Paul