On Wed, Feb 05, 2025 at 03:43:54PM +0530, K Prateek Nayak wrote: > Hello Peter, > > Thank you for the background! > > On 2/5/2025 3:25 PM, Peter Zijlstra wrote: > > On Wed, Feb 05, 2025 at 03:18:24PM +0530, K Prateek Nayak wrote: > > > > > Have there been any reports on an x86 system / VM where > > > topology_span_sane() was tripped? > > > > At the very least Intel SNC 'feature' tripped it at some point. They > > figured it made sense to have the LLC span two nodes. > > > > But I think there were some really dodgy VMs too. > > > > But yeah, its not been often. But basically dodgy BIOS/VM data can mess > > up things badly enough for it to trip. > > Has it ever happened without tripping the topology_sane() check first > on the x86 side? That I can't remember, sorry :/
