512 entries, 12 cycles to refill each entry from L2, at 3GHz that's only 2 microseconds worst case to refill the L1 cache. And that's if you keep the same task in it. If you're switching tasks most of it is going to get evicted anyway.
GCE uses KVM, which defaults to the linux scheduler with time slices from 0.75ms to 6ms, so the extra impact should be negligible. It's possible they tuned it weirdly, but I can't think of any reason to do so.
Flushes that occur from hypervisor calls could possibly have an impact, but those will happen whether you share a CPU or not.
GCE uses KVM, which defaults to the linux scheduler with time slices from 0.75ms to 6ms, so the extra impact should be negligible. It's possible they tuned it weirdly, but I can't think of any reason to do so.
Flushes that occur from hypervisor calls could possibly have an impact, but those will happen whether you share a CPU or not.