Author: kib
Date: Wed Mar 10 15:50:38 2010
New Revision: 204957
URL: http://svn.freebsd.org/changeset/base/204957
Log:
Fall back to wbinvd when region for CLFLUSH is >= 2MB.
Submitted by: Kevin Day <toasty dragondata com>
Reviewed by: jhb
MFC after: 2 weeks
Modified:
head/sys/amd64/amd64/pmap.c
head/sys/i386/i386/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Wed Mar 10 15:47:33 2010 (r204956)
+++ head/sys/amd64/amd64/pmap.c Wed Mar 10 15:50:38 2010 (r204957)
@@ -1105,7 +1105,8 @@ pmap_invalidate_cache_range(vm_offset_t
if (cpu_feature & CPUID_SS)
; /* If "Self Snoop" is supported, do nothing. */
- else if (cpu_feature & CPUID_CLFSH) {
+ else if ((cpu_feature & CPUID_CLFSH) != 0 &&
+ eva - sva < 2 * 1024 * 1024) {
/*
* Otherwise, do per-cache line flush. Use the mfence
@@ -1122,7 +1123,8 @@ pmap_invalidate_cache_range(vm_offset_t
/*
* No targeted cache flush methods are supported by CPU,
- * globally invalidate cache as a last resort.
+ * or the supplied range is bigger then 2MB.
+ * Globally invalidate cache.
*/
pmap_invalidate_cache();
}
Modified: head/sys/i386/i386/pmap.c
==============================================================================
--- head/sys/i386/i386/pmap.c Wed Mar 10 15:47:33 2010 (r204956)
+++ head/sys/i386/i386/pmap.c Wed Mar 10 15:50:38 2010 (r204957)
@@ -996,7 +996,8 @@ pmap_invalidate_cache_range(vm_offset_t
if (cpu_feature & CPUID_SS)
; /* If "Self Snoop" is supported, do nothing. */
- else if (cpu_feature & CPUID_CLFSH) {
+ else if ((cpu_feature & CPUID_CLFSH) != 0 &&
+ eva - sva < 2 * 1024 * 1024) {
/*
* Otherwise, do per-cache line flush. Use the mfence
@@ -1013,7 +1014,8 @@ pmap_invalidate_cache_range(vm_offset_t
/*
* No targeted cache flush methods are supported by CPU,
- * globally invalidate cache as a last resort.
+ * or the supplied range is bigger then 2MB.
+ * Globally invalidate cache.
*/
pmap_invalidate_cache();
}
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