i386/91328: L2/L3 cache of some IA32 CPUs not properly recognized.

[HATANOU Tomomi]

>Number:         91328
>Category:       i386
>Synopsis:       L2/L3 cache of some IA32 CPUs not properly recognized.
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan 05 01:50:06 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     HATANOU Tomomi
>Release:        FreeBSD 7.0-CURRENT i386
>Organization:
>Environment:
System: FreeBSD ryoko.infolab.ne.jp 7.0-CURRENT FreeBSD 7.0-CURRENT #13: Thu Jan 5 09:51:40 JST 2006 hatanou at ryoko.infolab.ne.jp:/usr/local/obj/usr/src/sys/CF-R3E i386
Machine:
1) Panasonic CF-R3E (Pentium-M 733 based micro notebook)
2) ASUS P2B-D with 2 x 700MHz Pentium-III

>Description:
As far as I know,

1) Pentium-M 733 (dothan core, ULV)
  L2 cache is not recognized.

2) Pentium-III w/ 256k L2
  L2 cache size is wrongly recognized as 128k.

>How-To-Repeat:
Boot verbosely, or view vm.stats.pagequeue.* sysctl variables.

>Fix:
Apply this patch to src/sys/i386/i386/identput.c

--- /sys/i386/i386/identcpu.c.orig	Tue Jan  3 23:43:38 2006
+++ /sys/i386/i386/identcpu.c	Thu Jan  5 10:33:46 2006
@@ -1344,6 +1344,12 @@
 	case 0x45:
 		printf("\n2nd-level cache: 2-MB, 4-way set associative, 32 byte line size");
 		break;
+	case 0x46:
+		printf("\n3rd-level cache: 4-MB, 4-way set associative, 64 byte line size");
+		break;
+	case 0x47:
+		printf("\n3rd-level cache: 8-MB, 8-way set associative, 64 byte line size");
+		break;
 	case 0x50:
 		printf("\nInstruction TLB: 4-KB, 2-MB or 4-MB pages, fully associative, 64 entries");
 		break;
@@ -1383,6 +1389,9 @@
 	case 0x72:
 		printf("\nTrace cache: 32K-uops, 8-way set associative");
 		break;
+	case 0x78:
+		printf("\n2nd-level cache: 1-MB, 4-way set associative, 64-byte line size");
+		break;
 	case 0x79:
 		printf("\n2nd-level cache: 128-KB, 8-way set associative, sectored cache, 64-byte line size");
 		break;
@@ -1395,6 +1404,12 @@
 	case 0x7c:
 		printf("\n2nd-level cache: 1-MB, 8-way set associative, sectored cache, 64-byte line size");
 		break;
+	case 0x7d:
+		printf("\n2nd-level cache: 2-MB, 8-way set associative, 64-byte line size");
+		break;
+	case 0x7f:
+		printf("\n2nd-level cache: 512-KB, 2-way set associative, 64-byte line size");
+		break;
 	case 0x82:
 		printf("\n2nd-level cache: 256-KB, 8-way set associative, 32 byte line size");
 		break;
@@ -1591,6 +1606,30 @@
 			*ways = 4;
 		}
 		break;
+	case 0x46:
+		/* 3rd-level cache: 4-MB, 4-way set associative,
+		 * 64 byte line size */
+		if (*size < 4096) {
+			*size = 4096;
+			*ways = 4;
+		}
+		break;
+	case 0x47:
+		/* 3rd-level cache: 8-MB, 8-way set associative,
+		 * 64 byte line size */
+		if (*size < 8192) {
+			*size = 8192;
+			*ways = 8;
+		}
+		break;
+	case 0x78:
+		/* 2nd-level cache: 1-MB, 4-way set associative,
+		 * 64-byte line size */
+		if (*size < 1024) {
+			*size = 1024;
+			*ways = 4;
+		}
+		break;
 	case 0x79:
 		/* 2nd-level cache: 128-KB, 8-way set associative,
 		 * sectored cache, 64-byte line size */
@@ -1623,11 +1662,27 @@
 			*ways = 8;
 		}
 		break;
+	case 0x7d:
+		/* 2nd-level cache: 2-MB, 8-way set associative,
+		 * 64-byte line size */
+		if (*size < 2048) {
+			*size = 2048;
+			*ways = 8;
+		}
+		break;
+	case 0x7f:
+		/* 2nd-level cache: 512-KB, 2-way set associative,
+		 * 64-byte line size */
+		if (*size < 512) {
+			*size = 512;
+			*ways = 2;
+		}
+		break;
 	case 0x82:
 		/* 2nd-level cache: 256-KB, 8-way set associative,
 		 * 32 byte line size */
-		if (*size < 128) {
-			*size = 128;
+		if (*size < 256) {
+			*size = 256;
 			*ways = 8;
 		}
 		break;

>Release-Note:
>Audit-Trail:
>Unformatted: