Date: Sun, 16 Aug 2015 14:30:15 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: [PATCH] replace a mfence instruction by an xchg instruction 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. Rich
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