On Mon, Jan 8, 2018 at 2:25 PM, Andi Kleen <a...@linux.intel.com> wrote: >> So pjt did alignment, a single unroll and per discussion earlier today >> (CET) or late last night (PST), he only does 16. > > I used the Intel recommended sequence, which recommends 32. > > Not sure if alignment makes a difference. I can check. > >> Why is none of that done here? Also, can we pretty please stop using >> those retarded number labels, they make this stuff unreadable. > > Personally I find the magic labels with strange ASCII characters > far less readable than a simple number. > > But can change it if you insist. > >> Also, pause is unlikely to stop speculation, that comment doesn't make >> sense. Looking at PJT's version there used to be a speculation trap in >> there, but I can't see that here. > > My understanding is that it stops speculation. But could also > use LFENCE. >
Neither pause nor lfence stop speculation. > -Andi