If it matters for this discussion, I’m pretty sure central doesn’t build with VS2013 today. At least it doesn’t for me. — - Milan
> On May 6, 2016, at 13:17 , Gregory Szorc <g...@mozilla.com> wrote: > > On Fri, May 6, 2016 at 9:39 AM, Benjamin Smedberg <benja...@smedbergs.us> > wrote: > >> I agree that we should drop support for non-SSE2. It mattered 7 years ago >> (see https://bugzilla.mozilla.org/show_bug.cgi?id=500277) but it really >> doesn't matter now. >> > > Wait - are we talking about requiring SSE or SSE2? The thread up to this > point was talking about requiring just SSE, not SSE2. I just want to make > sure we're on the same page since according to mhoye's post the non-SSE2 > population is ~25x larger than the non-SSE population... > > >> >> We do need to avoid updating these users to a build that will crash, and >> do the same "unsupported" messaging we're doing for old versions of MacOS. >> Gregory, will you own that? You will probably need to add CPU feature >> detection to the update URL/params for 47, or use some kind of system addon >> to shunt these users off the main update path. >> > > Given that 47 is in Beta, is it too late/risky to make this change on that > channel? Should we revert to VS2013 on Aurora/48 and make the updater > modifications on that channel? I think this will have minimal negative > impact, as most of the impact to changing toolchains would be on central, > as that is where most developers and automation live. > > >> >> On Fri, May 6, 2016 at 10:10 AM, Mike Hoye <mh...@mozilla.com> wrote: >> >>> On 2016-05-06 12:26 AM, Gregory Szorc wrote: >>> >>>> FWIW, the crashes we've seen so far are from incorrectly emitted movss >>>> instructions. This instruction is part of the original SSE instruction >>>> set, >>>> which was initially unveiled by Intel on the Pentium 3 in 1999 and later >>>> by >>>> AMD on the Duron and Athlon XP in 2000-2001. I'm not sure why we still >>>> need >>>> Firefox to run on processors manufactured in the 90s. >>>> >>> Per an IRC conversation with chutten, Firefox users on CPUs that do not >>> support SSE are 0.015% of our user base. (compared to 0.4% for no-SSE2). A >>> third of those are on otherwise-unsupported configurations (pre-SP3 XP, >>> etc), this work provides continuity of support to 0.01% of our users. >>> >>> - mhoye >>> >>> >>> 09:59 <chutten> So, to put it clearly and precisely, of the Firefox >>> Population in release and beta who are reporting at least base telemetry >>> collection on machines running supported configurations, only 0.01% cannot >>> definitively say they have SSE. >>> 10:00 <chutten> (according to a 1% random sample as stored in the >>> longitudinal dataset) >>> >>> _______________________________________________ >>> dev-platform mailing list >>> dev-platform@lists.mozilla.org >>> https://lists.mozilla.org/listinfo/dev-platform >>> >> >> > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
