One of the reasons MMIO is slower than port IO is
because it requires a page table lookup.
For normal memory accesses, this is solved by using the TLB
cache - but MMIO entries are either not present or reserved
and so are never cached.
To fix, allow installing an ioeventfd on top of a read only
One of the reasons MMIO is slower than port IO is
because it requires a page table lookup.
For normal memory accesses, this is solved by using the TLB
cache - but MMIO entries are either not present or reserved
and so are never cached.
To fix, allow installing an ioeventfd on top of a read only
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