[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] tools/libxl: make default of max event channels dependant on vcpus
On 26/03/2020 09:45, 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. > > Instead of requiring to specify the allowed number of event channels > via the "event_channels" domain config option, make the default > depend on the maximum number of vcpus of the guest. > > In order not to regress current configs use 1023 as the minimum > default setting. > > Signed-off-by: Juergen Gross <jgross@xxxxxxxx> :( I suspect I regressed this by making it not actually dead code. 1023 is the 32bit EVT 2L ABI limit, but until I moved max_evtchn into the createdomain hypercall, I'm pretty sure a limit never used to get set. If this is the case, then unlimited should be the default. ~Andrew
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