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Date: Sun, 16 Aug 2015 14:30:15 -0400
From: Rich Felker <>
Subject: Re: [PATCH] replace a mfence instruction by an xchg

On Sun, Aug 16, 2015 at 06:16:41PM +0200, Jens Gustedt wrote:
> > Still it
> > would be nice to know whether such failures still exist, and if so
> > where, so we can eventually clean this up.
> Replacing "mfence" by "lock ; orl $0,(%%rsp)" would provide us with
> security by not compromising performance :)

OK, I've done that for now. If we determine something else is better
in the future we can change it but for now I just want to reduce the
magnitude of the performance regression that will go in the release,
and this does it. :) Thanks.


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