Re: [PATCH] x86: Align jump targets to 1 byte boundaries

From: Borislav Petkov
Date: Fri Apr 10 2015 - 17:46:55 EST

On Fri, Apr 10, 2015 at 05:54:10PM +0200, Borislav Petkov wrote:
> On Fri, Apr 10, 2015 at 05:48:51PM +0200, Denys Vlasenko wrote:
> > As you know, manuals are not be-all, end-all documents.
> > They contains mistakes. And they are written before silicon
> > is finalized, and sometimes they advertise capabilities
> > which in the end had to be downscaled. It's hard to check
> > a 1000+ pages document and correct all mistakes, especially
> > hard-to-quantify ones.
> >
> > In the same document by Agner Fog, he says that he failed to confirm
> > 32-byte fetch on Fam16h CPUs:

So reportedly, the fetch window is 32-byte wide but I think there are
restrictions in the pipe elsewhere, which would have negative influence
on the actual throughput. And which could explain Agner's observations.


ECO tip #101: Trim your mails when you reply.
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