On 23.06.2022 10:24, Roger Pau Monne wrote: > Using cluster mode by default greatly limits the amount of vectors > available, as then vector space is shared amongst all the CPUs in the > logical cluster. > > This can lead to vector shortage issues on boxes with not a huge > amount of CPUs but with a non-trivial amount of devices, there are > reports of boxes with 32 CPUs (2 logical clusters, and thus only 414 > dynamic vectors) that run out of vectors and fail to setup interrupts > for dom0. > > This could be considered as a regression when switching from xAPIC > mode, as when using xAPIC only physical mode is supported.
When using more than 8 CPUs. You also don't mention the downside (higher IPI send effort) at all. Jan
