Re: [PATCH] x86, efi: retry ExitBootServices() on failure

From: Matt Fleming
Date: Mon Jun 17 2013 - 06:17:54 EST

On Mon, 17 Jun, at 10:46:28AM, Jan Beulich wrote:
> To me, all this looks like it is being done on phenomenological basis,
> taking a particular build of a particular firmware implementation as
> the reference. Imo we shouldn't change the code in this way. This
> also applies to the fact that the step is being doubled rather than
> e.g. tripled: With it ending up a "again" anyway (see below), what's
> the point of avoiding one more of the iterations?
> Generic considerations would result in the increment being at least
> 3 * element size; twice the element size assumes that the allocator
> would behave in certain ways (like returning the head or tail part of
> a larger piece of memory).

I have no issue with changing the multiplier. But let's get
clarification from Zach as to what exactly is going on here.

> I agree that there ought to be an upper limit. But a single retry here
> again looks like a tailored solution to a particular observed (mis-)
> behavior, rather than something resulting from general considerations.

What value would you suggest for the retry?

Matt Fleming, Intel Open Source Technology Center
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