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

["Lan, Tianyu" <tianyu.lan@xxxxxxxxx>]

On 8/25/2017 6:04 PM, Wei Liu wrote:
> 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.
How about producing a warning about event channel maybe not enough when 
vcpu number is >128 and still uses default max event channel number?

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