CVS commit: syssrc

["Michael L. Hitch" <mhitch%netbsd.org@localhost>]

Module Name:    syssrc
Committed By:   mhitch
Date:           Thu Nov  4 17:20:58 UTC 1999

Modified Files:
        syssrc/sys/arch/mips/mips: pmap.c

Log Message:
Only check for cache index compatiblity on MIPS3 if there is no secondary
cache.  With secondary cache, the CPU will detect cache coherency errors
and the Virtual Coherency Exception handler will flush the appropriate
cache lines to maintain cache coherency.  This allows much better
performance than inhibiting the cache for the entire page.  This is
very noticable when shared library mappings occur with incompatible
mappings, since there's a very likely chance the mappings will remain
for long periods of time.  Systems without secondary cache will still
have the cache inhibited, so there will still be performance issues if
shared libraries don't get mmaped() on correct memory alignments.

This fixes the current problems on DECstations using the R4x00 getting
coredumped programs.


To generate a diff of this commit:
cvs rdiff -r1.72 -r1.73 syssrc/sys/arch/mips/mips/pmap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.