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

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

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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