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Description of problem: /proc/cpuinfo does not announce several flags Version-Release number of selected component (if applicable): 2.6.18-238.1.1.el5 2.6.18-194.11.4.el5 2.6.18-194.el5 How reproducible: everytime Steps to Reproduce: 1. build program to query cpu-flags 2. cat /proc/cpuinfo 3. compare returned flags Actual results: > uname -r 2.6.18-194.11.4.el5 > grep "model name" /proc/cpuinfo model name : Intel(R) Xeon(R) CPU E5405 @ 2.00GHz model name : Intel(R) Xeon(R) CPU E5405 @ 2.00GHz model name : Intel(R) Xeon(R) CPU E5405 @ 2.00GHz model name : Intel(R) Xeon(R) CPU E5405 @ 2.00GHz > grep "flags" /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr sse4_1 lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr sse4_1 lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr sse4_1 lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr sse4_1 lahf_lm > ./cpu_flags SSE3: true PCLMULQD: false DTES64: true MONITOR/MWAIT: true SSE4_1: true SSE4_2: false > uname -r 2.6.18-238.1.1.el5 > grep "model name" /proc/cpuinfo model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz > /tmp/cpu_flags SSE3: true PCLMULQD: false DTES64: true MONITOR/MWAIT: true SSE4_1: true SSE4_2: false > uname -r 2.6.18-194.el5 > grep "model name" /proc/cpuinfo model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz model name : Intel(R) Xeon(R) CPU L5640 @ 2.27GHz grep flags /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm /tmp/cpu_flags SSE3: true PCLMULQD: true DTES64: true MONITOR/MWAIT: true SSE4_1: true SSE4_2: true On Xeon E5405.18-194.11.4.el5 DTES64 is supported but not reported via flags On Xeon E5420.18-238.1.1.el5 DTES64 is supported but not reported via flags On Xeon L5640.18-194.el5 DTES64 and PCLMULQD is supported but nor reported via flags Expected results: On Xeon E5405 at least DTES64 should be reported via flags On Xeon E5420 at least DTES64 should be reported via flags On Xeon L5640 at least DTES64 and PCLMULQD should be reported via flags Additional info: program-source #include <stdio.h> #define cpuid(func,ax,bx,cx,dx)\ __asm__ __volatile__ ("cpuid":\ "=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) : "a" (func)); int main(int argc, char *argv[]){ int a,b,c,d; cpuid(1,a,b,c,d); printf("SSE3:\t\t%s\n", (c&(1<<0))?"true":"false"); printf("PCLMULQD:\t%s\n", (c&(1<<1))?"true":"false"); printf("DTES64:\t\t%s\n", (c&(1<<2))?"true":"false"); printf("MONITOR/MWAIT:\t%s\n", (c&(1<<3))?"true":"false"); printf("SSE4_1:\t\t%s\n", (c&(1<<19))?"true":"false"); printf("SSE4_2:\t\t%s\n", (c&(1<<20))?"true":"false"); return 0; } I did not check for all flags.
This Bugzilla has been reviewed by Red Hat and is not planned on being addressed in Red Hat Enterprise Linux 5, and therefore is being closed. If this bug is critical to production systems, please contact your Red Hat support representative and provide a sufficient business justification in order to re-open it.