On Saturday, March 04, 2017 03:49:52 PM Pedro Giffuni wrote: > > > Il giorno 04 mar 2017, alle ore 14:43, John Baldwin <j...@freebsd.org> ha > > scritto: > > > > On Saturday, March 04, 2017 10:52:46 AM Pedro Giffuni wrote: > >> > >> On 03/04/17 10:32, Slawa Olhovchenkov wrote: > >>> On Sat, Mar 04, 2017 at 03:04:17PM +0000, Pedro F. Giffuni wrote: > >>> > >>>> Author: pfg > >>>> Date: Sat Mar 4 15:04:17 2017 > >>>> New Revision: 314669 > >>>> URL: https://svnweb.freebsd.org/changeset/base/314669 > >>>> > >>>> Log: > >>>> Drop i486 from the default i386 GENERIC kernel configuration. > >>>> > >>>> 80486 production was stopped by Intel on September 2007. Dropping the > >>>> 486 > >>>> configuration option from the GENERIC kernel improves performance > >>>> slightly. > >>>> > >>>> Removing I486_CPU is consistent at this time: we don't support any > >>>> processor without a FPU and the PC-98 arch, which frequently involved > >>>> i486 > >>>> CPUs, is also gone so we don't test such platforms anymore. > >>> > >>> What is realy mean? > >> > >> This means we don't do work-arounds that would be required for raw 486. > >> Instead we will use the 586 instructions by default. > > > > This doesn't change that. The kernel already has runtime tests in place > > for new things on 486 and later via cpuid. > > > > Hmm ..then I am wondering if I effectively changed anything?
The only change is a 486 now panics on boot when it used to work fine. :-/ Nothing for other CPUs has changed. > The number came out from an old posting involving buildworld times, which I > can’t find now :(. > Things seem to have changed a lot: it was surely using GCC back then, I don’t > believe clang does much distinction about 486 at all. > > BTW, does it make sense to keep i586 in the configuration still? Both i486 > and i586 were once removed but later re-instated in r205336. If anything I'd probably say we should do what bde@ suggested and just remove CPU class entirely (and act as if 486, 586, and 686 are always defined). -- John Baldwin _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
