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Kasumi_Ninja
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Joined: 18 Feb 2006
Posts: 1825
Location: The Netherlands
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 Posted: Sat Apr 07, 2007 7:55 pm Post subject: (SOLVED) Mobile AMD Sempron Processor 3500+ CFlag question |
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Currently I am installing Gentoo on my laptop. I checked the wiki for cflags:
| Quote: | | Check it out, there are many different sempron mobile CPUs on sale, those that work at 1.8GHz are K8 (i.e. AMD SM 3000+), some others, older, aren't yet k8 but they're still k7 so you must specify athlon-xp instead of athlon64 |
http://gentoo-wiki.com/Safe_Cflags#Mobile_Sempron_.28AMD.29
I wonder thought if should use march=athlon-xp or athlon64 for cflags. Any help would be appreciated!
# cat /proc/cpuinfo
| Code: | processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 76
model name : Mobile AMD Sempron(tm) Processor 3500+
stepping : 2
cpu MHz : 1800.000
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow up pni cx16 lahf_lm cr8legacy ts fid vid ttp tm stc
bogomips : 3619.56 |
# lsmod (from Gentoo livecd)
| Code: | Module Size Used by
ipv6 178400 8
pcspkr 1760 0
snd_hda_intel 11956 1
snd_hda_codec 101120 1 snd_hda_intel
snd_pcm 45156 2 snd_hda_intel,snd_hda_codec
snd_timer 14212 1 snd_pcm
snd 30564 6 snd_hda_intel,snd_hda_codec,snd_pcm,snd_timer
snd_page_alloc 6024 2 snd_hda_intel,snd_pcm
forcedeth 19884 0
amd64_agp 8292 0
agpgart 17888 1 amd64_agp
rtc 8660 0
nfs 79276 0
lockd 41416 1 nfs
sunrpc 100540 2 nfs,lockd
jfs 143884 0
dm_mirror 14128 0
dm_mod 36024 1 dm_mirror
pdc_adma 6180 0
sata_mv 12712 0
ata_piix 8036 0
ahci 10756 0
sata_qstor 6372 0
sata_vsc 5380 0
sata_uli 4772 0
sata_sis 5188 0
sata_sx4 9732 0
sata_nv 6212 3
sata_via 5636 0
sata_svw 4900 0
sata_sil24 7780 0
sata_sil 6408 0
sata_promise 7748 0
libata 40044 15 pdc_adma,sata_mv,ata_piix,ahci,sata_qstor,sata_vsc,sata_uli,sata_sis,sata_sx4,sata_nv,sata_via,sata_svw,sata_sil24,sata_sil,sata_promise
sbp2 15848 0
ohci1394 25456 0
ieee1394 55416 2 sbp2,ohci1394
sl811_hcd 8960 0
ohci_hcd 14468 0
uhci_hcd 16296 0
usb_storage 55456 1
usbhid 31488 0
ehci_hcd 21608 0
usbcore 80448 7 sl811_hcd,ohci_hcd,uhci_hcd,usb_storage,usbhid,ehci_hcd |
Update: I also wonder which kernel option to set  :
| Code: |
│ ( ) Athlon/Duron/K7 │ │
│ │ (X) Opteron/Athlon64/Hammer/K8 |
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Last edited by Kasumi_Ninja on Thu Apr 12, 2007 9:31 pm; edited 1 time in total |
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ttuegel
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Joined: 18 Jan 2005
Posts: 176
Location: Illinois, USA
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| Posted: Sat Apr 07, 2007 9:04 pm Post subject: |
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| You can safely use "-march=athlon64" in your CFLAGS, as your Sempron chip runs at 1.8GHz (and is therefore a newer model). You can also use "-msse3" as your cpuinfo lists "pni" in the features. In the kernel, you can also select support for Athlon64/K8 chips. |
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aceFruchtsaft
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Joined: 16 May 2004
Posts: 438
Location: Vienna, Austria
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| Posted: Sat Apr 07, 2007 10:40 pm Post subject: |
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| ttuegel wrote: | | You can safely use "-march=athlon64" in your CFLAGS.... |
I think that depends on whether you run 32bit or 64bit Gentoo. I doubt that enabling 64bit instructions in gcc would be a good idea on a 32bit system. |
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ttuegel
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Joined: 18 Jan 2005
Posts: 176
Location: Illinois, USA
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| Posted: Sat Apr 07, 2007 10:48 pm Post subject: |
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| aceFruchtsaft wrote: | | ttuegel wrote: | | You can safely use "-march=athlon64" in your CFLAGS.... |
I think that depends on whether you run 32bit or 64bit Gentoo. I doubt that enabling 64bit instructions in gcc would be a good idea on a 32bit system. |
Using "-march=athlon64" does not enable 64bit instructions, unless your CHOST is set to "x86_64-pc-linux-gnu". For "i686-pc-linux-gnu" hosts, it enables all the 32bit optimizations for K8 processors, but none of the 64bit optimizations. The march setting will only affect what optimizations gcc uses: the type of machine code it produces is determined by CHOST. |
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aceFruchtsaft
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Joined: 16 May 2004
Posts: 438
Location: Vienna, Austria
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| Posted: Sat Apr 07, 2007 11:09 pm Post subject: |
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| ttuegel wrote: | | aceFruchtsaft wrote: | | ttuegel wrote: | | You can safely use "-march=athlon64" in your CFLAGS.... |
I think that depends on whether you run 32bit or 64bit Gentoo. I doubt that enabling 64bit instructions in gcc would be a good idea on a 32bit system. |
Using "-march=athlon64" does not enable 64bit instructions, unless your CHOST is set to "x86_64-pc-linux-gnu". For "i686-pc-linux-gnu" hosts, it enables all the 32bit optimizations for K8 processors, but none of the 64bit optimizations. The march setting will only affect what optimizations gcc uses: the type of machine code it produces is determined by CHOST. |
Ok, thanks.
I only checked the gcc manual which states that:
| Code: |
k8, opteron, athlon64, athlon-fx
AMD K8 core based CPUs with x86-64 instruction set support. (This supersets MMX, SSE, SSE2, 3dNOW!, enhanced 3dNOW! and 64-bit instruction set extensions.)
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without giving a more detailed explanation (it probably does somewhere else). |
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Kasumi_Ninja
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Posts: 1825
Location: The Netherlands
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| Posted: Thu Apr 12, 2007 9:30 pm Post subject: |
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Thanks all. It works flawlessly now  .
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