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Re: [Xen-devel] [PATCH v2 03/23] x86: zero BSS using stosl instead of stosb

On Tue, Jul 21, 2015 at 03:37:48AM -0600, Jan Beulich wrote:
> >>> On 20.07.15 at 16:28, <daniel.kiper@xxxxxxxxxx> wrote:
> ... because of ??? Nowadays - with X86_FEATURE_ERMS - rep stosb
> is expected to be faster than rep stosl.

OK, I did not know about that. However, as I know this feature
was introduced in 2012 with Ivy Bridge. So, I suppose that there
are still a lot of machines in the wild which does not support it.
Anyway, because this code is not performance critical I am not going
to insist on one or another solution. However, Andrew suggested that
thing, so, please agree with him in which direction we should go.
I will do what you agree.


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