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[Xen-devel] Buffered IO for IO?

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Subject: [Xen-devel] Buffered IO for IO?
From: "Zulauf, John" <john.zulauf@xxxxxxxxx>
Date: 2007年7月20日 14:33:14 -0700
Delivery-date: 2007年7月20日 14:30:58 -0700
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Thread-index: AcfJ+4xa03nXqi+ITfuOyWNblE0QKgBGW8sw
Thread-topic: Buffered IO for IO?
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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