Re: [Xen-devel] [PATCH] tools/libxl: make default of max event channels dependant on vcpus

[Jan Beulich <jbeulich@xxxxxxxx>]

On 26.03.2020 10:45, Juergen Gross wrote:
> Today the maximum number of event channels for a guest is defaulting
> to 1023. For large guests with lots of vcpus this is not enough, as
> e.g. the Linux kernel uses 7 event channels per vcpu, limiting the
> guest to about 140 vcpus.

I don't think any particular guest OS should "dictate" the default
here. What if another OS (or even a future version of Linux) requires
more than 8? And why would the value depend on number of vCPU-s but
not number and kind of virtual devices?

Jan