3 ms·
Wouldn't virtualization kill the perf benefit, or is this supposed to run "on the metal"?
by z3t4 7y ago
Wouldn't virtualization kill the perf benefit, or is this supposed to run "on the metal"?
- rusk 7y agoI think that depends ... I'm not an expert on virtualisation but I've seen some cases where VMs get full bare-metal access to system functions, albeit supervised. I think this is the purpose of virtualisation extensions on modern architectures (e.g. VT-x) - this is how it's possible to have a 64-bit OS run virtualised on a 64-bit processor. EDIT - but even without this, the comparison with user-space holds.
- gjulianm 7y agoI don't know about other devices, but network cards have pretty good support for virtualization. A lot of them have virtual devices that the card generates and are added to the system as if they were different PCI devices. Then, each VM gets one of those virtual devices and they access it directly as a regular PCI device, with no virtualization layer whatsoever.
- nickysielicki 7y agoIt’s a VM in the JIT sense, not a VM in the VMWare sense.
- zymhan 7y agoVirtualized OSes can still access network hardware directly via SR-IOV