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stardotstar
l33t
Joined: 10 Feb 2006
Posts: 887
Location: 2074/SYD/NSW/AU
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 Posted: Thu Nov 06, 2008 9:48 am Post subject: Intel Atom N270 - how best to configure kernel CPU |
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I see that my intel Atom N270
http://www.intel.com/products/processor/atom/index.htm
shows two cpu/cores in cpuinfo
| Code: |
eddy proc # cat cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU N270 @ 1.60GHz
stepping : 2
cpu MHz : 1600.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts pni monitor ds_cpl est tm2 ssse3 xtpr lahf_lm
bogomips : 3204.20
clflush size : 64
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU N270 @ 1.60GHz
stepping : 2
cpu MHz : 1600.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts pni monitor ds_cpl est tm2 ssse3 xtpr lahf_lm
bogomips : 3199.55
clflush size : 64
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I read that this is not really a core duo setup but the hyperthreading but I am far from experienced in these things.
So far I have followed what sense I could get from all the documentation and have this for my make.conf
| Code: | eddy proc # cat /etc/make.conf
# These settings were set by the catalyst build script that automatically
# built this stage.
# Please consult /etc/make.conf.example for a more detailed example.
CFLAGS="-O2 -march=prescott -pipe -fomit-frame-pointer"
CXXFLAGS="$CFLAGS"
# WARNING: Changing your CHOST is not something that should be done lightly.
# Please consult http://www.gentoo.org/doc/en/change-chost.xml before changing.
CHOST="i686-pc-linux-gnu"
MAKEOPTS="-j2"
USE="vim-syntax vim wifi audacious mp3 wma vorbis xcomposite ftp cdrw cddb jpeg gif win32codecs java cpufreq acpi xscreensaver dbus hal alsa gpm X cups mysql ipv4 -ipv6"
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and all seems well but I want to know what kernel cpu features I should have set for best performance - before I start clocking it and so on././
| Code: |
#
# Processor type and features
#
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
CONFIG_SMP=y
# CONFIG_X86_PC is not set
# CONFIG_X86_ELAN is not set
# CONFIG_X86_VOYAGER is not set
# CONFIG_X86_NUMAQ is not set
# CONFIG_X86_SUMMIT is not set
# CONFIG_X86_BIGSMP is not set
# CONFIG_X86_VISWS is not set
CONFIG_X86_GENERICARCH=y
# CONFIG_X86_ES7000 is not set
# CONFIG_X86_RDC321X is not set
# CONFIG_X86_VSMP is not set
CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
# CONFIG_PARAVIRT_GUEST is not set
CONFIG_X86_CYCLONE_TIMER=y
# CONFIG_M386 is not set
# CONFIG_M486 is not set
# CONFIG_M586 is not set
# CONFIG_M586TSC is not set
# CONFIG_M586MMX is not set
# CONFIG_M686 is not set
# CONFIG_MPENTIUMII is not set
CONFIG_MPENTIUMIII=y
# CONFIG_MPENTIUMM is not set
# CONFIG_MPENTIUM4 is not set
# CONFIG_MK6 is not set
# CONFIG_MK7 is not set
# CONFIG_MK8 is not set
# CONFIG_MCRUSOE is not set
# CONFIG_MEFFICEON is not set
# CONFIG_MWINCHIPC6 is not set
# CONFIG_MWINCHIP2 is not set
# CONFIG_MWINCHIP3D is not set
# CONFIG_MGEODEGX1 is not set
# CONFIG_MGEODE_LX is not set
# CONFIG_MCYRIXIII is not set
# CONFIG_MVIAC3_2 is not set
# CONFIG_MVIAC7 is not set
# CONFIG_MPSC is not set
# CONFIG_MCORE2 is not set
# CONFIG_GENERIC_CPU is not set
CONFIG_X86_GENERIC=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_L1_CACHE_SHIFT=7
CONFIG_X86_XADD=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_TSC=y
CONFIG_X86_CMOV=y
CONFIG_X86_MINIMUM_CPU_FAMILY=4
CONFIG_X86_DEBUGCTLMSR=y
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
# CONFIG_IOMMU_HELPER is not set
CONFIG_NR_CPUS=32
CONFIG_SCHED_SMT=y
CONFIG_SCHED_MC=y
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_MCE=y
CONFIG_X86_MCE_NONFATAL=y
CONFIG_X86_MCE_P4THERMAL=y
CONFIG_VM86=y
# CONFIG_TOSHIBA is not set
# CONFIG_I8K is not set
# CONFIG_X86_REBOOTFIXUPS is not set
CONFIG_MICROCODE=y
CONFIG_MICROCODE_OLD_INTERFACE=y
CONFIG_X86_MSR=y
CONFIG_X86_CPUID=y
# CONFIG_NOHIGHMEM is not set
CONFIG_HIGHMEM4G=y
# CONFIG_HIGHMEM64G is not set
CONFIG_PAGE_OFFSET=0xC0000000
CONFIG_HIGHMEM=y
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
# CONFIG_DISCONTIGMEM_MANUAL is not set
# CONFIG_SPARSEMEM_MANUAL is not set
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
# CONFIG_SPARSEMEM_STATIC is not set
# CONFIG_SPARSEMEM_VMEMMAP_ENABLE is not set
CONFIG_SPLIT_PTLOCK_CPUS=4
CONFIG_RESOURCES_64BIT=y
CONFIG_ZONE_DMA_FLAG=1
CONFIG_BOUNCE=y
CONFIG_VIRT_TO_BUS=y
# CONFIG_HIGHPTE is not set
# CONFIG_MATH_EMULATION is not set
CONFIG_MTRR=y
# CONFIG_EFI is not set
# CONFIG_IRQBALANCE is not set
CONFIG_SECCOMP=y
# CONFIG_HZ_100 is not set
# CONFIG_HZ_250 is not set
# CONFIG_HZ_300 is not set
CONFIG_HZ_1000=y
CONFIG_HZ=1000
CONFIG_SCHED_HRTICK=y
# CONFIG_KEXEC is not set
# CONFIG_CRASH_DUMP is not set
CONFIG_PHYSICAL_START=0x100000
# CONFIG_RELOCATABLE is not set
CONFIG_PHYSICAL_ALIGN=0x100000
CONFIG_HOTPLUG_CPU=y
CONFIG_COMPAT_VDSO=y
CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
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this is:
| Code: |
eddy proc # uname -a
Linux eddy 2.6.25-gentoo-r8-eddy-alpha #3 SMP Fri Nov 7 16:56:55 EST 2008 i686 Intel(R) Atom(TM) CPU N270 @ 1.60GHz GenuineIntel GNU/Linux
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Looking forward to your thoughts Gen2ers.
\\'
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nurachi
Tux's lil' helper
Joined: 16 May 2008
Posts: 92
Location: Paris
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| Posted: Fri Nov 07, 2008 1:40 am Post subject: |
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You can add these flags to your USE:
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stardotstar
l33t
Joined: 10 Feb 2006
Posts: 887
Location: 2074/SYD/NSW/AU
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| Posted: Fri Nov 07, 2008 8:56 am Post subject: |
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Thank you!
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darkstarbyte
Tux's lil' helper
Joined: 23 Aug 2010
Posts: 120
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| Posted: Sun Jan 09, 2011 8:38 pm Post subject: Re: Intel Atom N270 - how best to configure kernel CPU |
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| stardotstar wrote: | I see that my intel Atom N270
| Code: |
CONFIG_MPENTIUMIII=y
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If you want the most from that kernel of your architecture wise use.
If the Intel Atom N270 really is presscott like you said above then the CONFIG_MPENTIUM4=y should be set.
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You know you're a geek when...
you're whiling away some time in the computer department at your local store, spot a dialog box on the one of the laptops that calmly announces"Mcfee. Your computer is at risk",and totally get the unintended humor. |
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Gusar
Advocate
Joined: 09 Apr 2005
Posts: 2665
Location: Slovenia
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| Posted: Sun Jan 09, 2011 10:50 pm Post subject: |
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The kernel has an option specifically for Atom (CONFIG_MATOM=y), why not use that?
For CFLAGS, simply use -march=native |
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ffwd
n00b
Joined: 08 Aug 2007
Posts: 12
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| Posted: Fri Mar 25, 2011 7:09 pm Post subject: |
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regarding use flags u can add "ssse3" as well
as for kernel cpu selection, with gcc-4.5 you can select "atom", gcc-4.4 go for "core2" and select "generic x86 optimizations" |
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