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Re: [Xen-devel] [RFC PATCH 2/5] XL: Increase event channels to support more vcpus

On Fri, Aug 25, 2017 at 10:57:26AM +0100, Roger Pau Monné wrote:
> On Fri, Aug 25, 2017 at 10:18:24AM +0100, Wei Liu wrote:
> > On Thu, Aug 24, 2017 at 10:52:17PM -0400, Lan Tianyu wrote:
> > > This patch is to increase event channels to support more vcpus in single 
> > > VM.
> > > 
> > > Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
> > 
> > There is no need to bump the default. There is already a configuration
> > option called max_event_channel.
> Maybe make this somehow based on the number of vCPUs assigned to the
> domain?
> It's not very used-friendly to allow the creation of a domain with 256
> vCPUs for example that would then get stuck during boot.
> Or at least check max_event_channel and the number of vCPUs and print
> a warning message to alert the user that things might go wrong with
> this configuration.

The problem is number of vcpu is only one factor that would affect the
number of event channels needed.

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