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.
Some Via CPU is like i486 (by instruction set).
CPU: VIA Ezra (800.04-MHz 686-class CPU)
Origin="CentaurHauls" Id=0x678 Family=0x6 Model=0x7 Stepping=8
Features=0x803035<FPU,DE,TSC,MSR,MTRR,PGE,MMX>
AMD Features=0x80000000<3DNow!>
486 never had MMX extensions.
This is a 686, performance should improve ~4%.
Pedro.
_______________________________________________
svn-src-head@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
