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Re: [Xen-devel] [PATCH 2/5] MdePkg: Allow PcdFSBClock to by Dynamic
- To: "Gao, Liming" <liming.gao@xxxxxxxxx>
- From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Date: Mon, 3 Feb 2020 15:34:07 +0000
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- Cc: "Feng, Bob C" <bob.c.feng@xxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, "Justen, Jordan L" <jordan.l.justen@xxxxxxxxx>, "devel@xxxxxxxxxxxxxx" <devel@xxxxxxxxxxxxxx>, "Kinney, Michael D" <michael.d.kinney@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Laszlo Ersek <lersek@xxxxxxxxxx>
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On Mon, Feb 03, 2020 at 01:34:55AM +0000, Gao, Liming wrote:
> Anthony:
> This change is OK to me. But if this PCD is configured as Dynamic, its
> value will be got from PCD service. This operation will take some time and
> cause the inaccurate time delay. Have you measured its impact?
No, I haven't. But I don't think it matter in a Xen guest, the APIC timer is
emulated anyway, so reading from a register of the APIC is going to be
slower than getting the value from the PCD services, I think.
(Hopefully, I'm not too wrong.)
But I'll give it at measuring the difference, it would be interesting to
know.
Thanks,
--
Anthony PERARD
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