[Xen-devel] Buffered IO for IO?

["Zulauf, John" <john.zulauf@xxxxxxxxx>]

Has anyone experimented with adding Buffered IO support for "out"
instructions?  Currently, the buffered io pages is only used for mmio
writes (and then only to vga space).  It seems quite straight-forward to
add.

Two questions:

(1) Does buffering actually have a measurable performance impact in it's
current use?

(2) Has anyone experimented with adding COM port ioreq buffering?

If not I'll give it a rip and shout out what I find.

John

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