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
