https://www.theregister.co.uk/2018/07/26/meldown_spectre_batters_hpc/

HPC admin? Feeling slighted that all the good Spectre/Meltdown mitigation benchmarks ignore big iron? Fear not, a bunch of MIT boffins are on your side.

Unfortunately, what they found is that network connections, disk accesses, and computational workloads can all be affected by the fixes, whether in the operating system or the microcode.