On 12/15/21 8:56 AM, David Woodhouse wrote:
Doing the INIT/SIPI/SIPI in parallel for all APs and *then* waiting for them shaves about 80% off the AP bringup time on a 96-thread socket Skylake box (EC2 c5.metal) — from about 500ms to 100ms. There are more wins to be had with further parallelisation, but this is the simple part.
I applied this series and began booting a regular non-SEV guest and hit a failure at 39 vCPUs. No panic or warning, just a reset and OVMF was executing again. I'll try to debug what's going, but not sure how quickly I'll arrive at anything.
Thanks, Tom
