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APERF, Increase, Unpredictably

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Revision Guide for AMD Family 15h Models 00h-0Fh Processors 660 APERF May Increase Unpredictably 48063 Rev. 3.18 October 2012 Description The value of MSR0000_00E8 (APERF) may increase unpredictably after any of the following events: • A P-state transition, including those performed due to core performance boost (CPB). • A C-state transition. • A change in the P-state limit due to hardware thermal control (HTC), application power management (APM) or advanced platform management link (APML) TDP limiting. • Execution of the MWAIT instruction. Potential Effect on System Software may calculate the effective frequency of a core incorrectly or observe that the APERF register value appears to increase unpredictably. Suggested Workaround Contact your AMD representative for information on a BIOS update. Fix Planned Yes 52 Product Errata

Section	Page
List of Figures	3
List of Tables	4
Revision History	5
Overview	6
Revision Guide Policy	6
Conventions	7
Numbering	7
Register References and Mnemonics	7
Arithmetic and Logical Operators	8
Processor Identification	9
Revision Determination	9
D18F4x164 Fixed Errata Register	10
Mixed Processor Revision Support	11
Programming and Displaying the Processor Name String	11
Constructing the Processor Name String	11
Operating System Visible Workarounds	13
MSRC001_0140 OS Visible Work-around MSR0 (OSVW_ID_Length)	13
MSRC001_0141 OS Visible Work-around MSR1 (OSVW_Status)	13
Product Errata	14
Cross-Reference of Errata to Package Type	18
Cross-Reference of Errata to Processor Segments	21
361 Breakpoint Due to an Instruction That Has an Interrupt Shadow May Be Lost	24
503 APIC Task-Priority Register May Be Incorrect	25
504 Corrected L3 Errors May Lead to System Hang	26
505 Scrub Rate Control Register Address Depends on DctCfgSel	27
520 Some Lightweight Profiling Counters Stop Counting When Instruction-Based Sampling is Enabled	28
535 Lightweight Profiling May Not Indicate Fused Branch	29
536 Performance Counter for Instruction Cache Misses Does Not Increment for Sequential Prefetches	30
537 Performance Counter for Ineffective Software Prefetches Does Not Count for L2 Hits	31
538 Performance Counter Does Not Count for Some Retired Micro-Ops	32
540 GART Table Walk Probes May Cause System Hang	33
550 Latency Performance Counters Are Not Accurate	34
585 Incorrect Memory Controller Operation Due to a WrDatGrossDly Setting of 3.5 MEMCLKs	35
586 A Far Control Transfer Changing Processor Operating Mode May Generate a False Machine Check	36
592 VPEXTRQ and VPINSRQ May Not Signal Invalid-Opcode Exception	37
593 Last-Branch Record Enabled May Cause Machine Check and Incorrect LastBranchToIp	38
600 HyperTransport™ Link Retry Due to Partial CRC Error May Cause System Hang	39
602 HyperTransport™ Link Frequency Changes May Cause a System Hang	40
608 P-state Limit Changes May Not Generate Interrupts	41
619 Non-Posted Reads May Block Write Dependent on Probe Responses	42
623 Small Code Segment Limits May Cause Incorrect Limit Faults	43
624 SB-RMI Processor State Accesses May Persistently Timeout if Interrupted by a Warm Reset	44
625 SB-RMI Writes May Not Be Observed by Processor	45
636 Instruction Addresses Near Canonical Address Limit May Cause #GP Exception	46
637 Processor Does Not Report the Correct DRAM Address for MCA Errors Within the CC6 Save Area	47
657 MC1_STATUS Enable Bit Not Set When Logging Corrected Errors	49
658 CPUID Incorrectly Reports Large Page Support in L2 Instruction TLB	50
659 VMCB Interrupt Shadow Status May Be Incorrect	51
660 APERF May Increase Unpredictably	52
661 P-State Limit and Stop Clock Assertion May Cause System Hang	53
663 Local Interrupts LINT0/LINT1 May Occur While APIC is Software Disabled	54
667 Processor May Generate Incorrect P-state Limit Interrupts	55
668 Load Operation May Receive Incorrect Data After Floating-point Exception	56
671 Debug Breakpoint on Misaligned Store May Cause System Hang	57
672 SVM Guest Performance Counters May Be Inaccurate Due to SMI	58
673 Misaligned Page Crossing String Operations May Cause System Hang	59
674 Processor May Cache Prefetched Data from Remapped Memory Region	60
675 Instructions Performing Read-Modify-Write May Alter Architectural State Before #PF	61
685 Some Processor Cores May Have Inaccurate Instruction Cache Fetch Performance Counter	62
689 AM3r2 Six Core Processor May Limit P-State When Core C6 State Is Disabled	63
690 Northbridge FIFO Read/Write Pointer Overlap May Cause Hang or Protocol Error Machine Check	64
691 Processors Using 1 MB L3 Subcaches May Execute a Write-Back Invalidate Operation Incorrectly	65
693 Performance Counter May Incorrectly Count MXCSR Loads	66
694 IBS Sampling of Instruction Fetches May Be Uneven	67
695 Processor May Interpret FCW Incorrectly after FNSAVE/FSAVE Limit Fault	68
699 Processor May Generate Illegal Access in VMLOAD or VMSAVE Instruction	69
704 Processor May Report Incorrect Instruction Pointer	70
707 Performance Counter for Locked Operations May Count Cycles from Non-Locked Operations	71
708 Initial Value of Time Stamp Counter May Include an Offset Error	72
709 Processor May Be Limited to Minimum P-state After a P-state Limit Change	73
714 Processor May Check DRAM Address Maps While Using L2 Cache as General Storage during Boot	74
717 Instruction-Based Sampling May Be Inaccurate	75
718 Instruction-Based Sampling May Be Inaccurate	76
719 Instruction-Based Sampling Fetch Counter Always Starts at Maximum Value	77
720 Processor May Not Respect Interrupt Shadow	78
724 Unintercepted Halt Instruction May Cause Protocol Machine Check or Unpredictable System Behavior	79
725 Incorrect APIC Remote Read Behavior	80
726 Processor May Report Incorrect MCA Address for Loads that Cross Address Boundaries	81
727 Processor Core May Hang During CC6 Resume	82
734 Processor May Incorrectly Store VMCB Data	83
737 Processor Does Not Check 128-bit Canonical Address Boundary Case on Logical Address	84
739 Processor May Read Branch Status Register With Inconsistent Parity Bit	85
740 Lightweight Profiling May Cause System Hang with Concurrent Stop Clock	86
742 DRAM Scrub Request During Register Write May Cause Unpredictable Behavior	87
744 Processor CC6 May Not Restore Trap Registers	88
745 Processor May Incorrectly Report Cache Sharing Property in CPUID Topology	89
759 One Core May Observe a Time Stamp Counter Skew	90

Match case Limit results 1 per page

660

APERF

May

Increase

Unpredictably

Description

The

value

MSR

0000_00

8 (

APERF

may

increase

unpredictably

after

any

the

following

events

•

P-state

transition

including

those

performed

due

core

performance

boost

(

CPB

•

C-state

transition

•

change

the

P-state

limit

due

hardware

thermal

control

(

HTC

application

power

management

(

APM

advanced

platform

management

link

(

APML

TDP

limiting

•

Execution

the

MWAIT

instruction

Potential

Effect

System

Software

may

calculate

the

effective

frequency

core

incorrectly

observe

that

the

APERF

value

appears

increase

unpredictably

Suggested

Workaround

Contact

your

AMD

representative

for

information

BIOS

update

Fix

Planned

Yes

Revision

Guide

for

AMD

Family

Models

Processors

48063

Rev

. 3.18

October

2012

Product

Errata