Displaying 2 results from an estimated 2 matches for "movw_fast".
2013 Feb 28
5
virtio PCI on KVM without IO BARs
...ransactions and their emulation on KVM on x86
(it would be trivial to use memory BARs on non x86 platforms
if they don't have PIO).
Example benchmark (cycles per transaction):
(io access) outw 1737
(memory access) movw 4341
for comparison:
(hypercall access): vmcall 1566
(pv memory access) movw_fast 1817 (*explanation what this is below)
This creates a problem if we want to make virtio devices
proper PCI express devices with native hotplug support.
This is because each hotpluggable PCI express device always has
a PCI express port (port per device),
where each port is represented by a PCI to P...
2013 Feb 28
5
virtio PCI on KVM without IO BARs
...ransactions and their emulation on KVM on x86
(it would be trivial to use memory BARs on non x86 platforms
if they don't have PIO).
Example benchmark (cycles per transaction):
(io access) outw 1737
(memory access) movw 4341
for comparison:
(hypercall access): vmcall 1566
(pv memory access) movw_fast 1817 (*explanation what this is below)
This creates a problem if we want to make virtio devices
proper PCI express devices with native hotplug support.
This is because each hotpluggable PCI express device always has
a PCI express port (port per device),
where each port is represented by a PCI to P...