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My two cents worth : |
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Update gcc before changing any hardware. |
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With gcc somewhat current, try this on the replacement CPU. |
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This gives a listing of all CPU supported compiler flags. |
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Including -mtune / -march :) |
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|
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gcc -c -Q -march=native --help=target |
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sample of output : |
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|
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-msse4 [enabled] |
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-msse4.1 [enabled] |
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-msse4.2 [enabled] |
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-msse4a [enabled] |
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-msse5 |
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-msseregparm [disabled] |
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-mssse3 [enabled] |
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-mstack-arg-probe [disabled] |
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-mstack-protector-guard= tls |
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-mstackrealign [disabled] |
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-mstringop-strategy= [default] |
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-mstv [enabled] |
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-mtbm [enabled] |
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-mtls-dialect= gnu |
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-mtls-direct-seg-refs [enabled] |
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-mtune-ctrl= |
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-mtune= bdver2 |
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-muclibc [disabled] |
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-mveclibabi= [default] |
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-mvect8-ret-in-mem [disabled] |
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-mvzeroupper [enabled] |
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-mx32 [disabled] |
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-mxop [enabled] |
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-mxsave [enabled] |
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-mxsavec [disabled] |
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-mxsaveopt [disabled] |
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-mxsaves [disabled] |
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|
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This will give you the L1 / L2 cache/line/size parameters : |
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|
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gcc -### -march=native /usr/include/stdlib.h |
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|
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sample of output : |
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|
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gcc version 7.3.0 (Gentoo 7.3.0-r3 p1.4) |
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COLLECT_GCC_OPTIONS='-march=native' |
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/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1 -quiet |
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/usr/include/stdlib.h "-march=bdver2" -mmmx -mno-3dnow -msse -msse2 |
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-msse3 -mssse3 -msse4a -mcx16 -msahf -mno-movbe -maes -mno-sha -mpclmul |
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-mpopcnt -mabm -mlwp -mfma -mfma4 -mxop -mbmi -mno-sgx -mno-bmi2 -mtbm |
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-mavx -mno-avx2 -msse4.2 -msse4.1 -mlzcnt -mno-rtm -mno-hle -mno-rdrnd |
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-mf16c -mno-fsgsbase -mno-rdseed -mprfchw -mno-adx -mfxsr -mxsave |
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-mno-xsaveopt -mno-avx512f -mno-avx512er -mno-avx512cd -mno-avx512pf |
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-mno-prefetchwt1 -mno-clflushopt -mno-xsavec -mno-xsaves -mno-avx512dq |
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-mno-avx512bw -mno-avx512vl -mno-avx512ifma -mno-avx512vbmi |
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-mno-avx5124fmaps -mno-avx5124vnniw -mno-clwb -mno-mwaitx -mno-clzero |
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-mno-pku -mno-rdpid --param "l1-cache-size=16" --param |
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"l1-cache-line-size=64" --param "l2-cache-size=2048" "-mtune=bdver2" |
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-quiet -dumpbase stdlib.h -auxbase stdlib -o /tmp/ccQiaXih.s |
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"--output-pch=/usr/include/stdlib.h.gch" |
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Reference Link : https://wiki.gentoo.org/wiki/GCC_optimization |
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On 12/6/18 3:27 AM, Dale wrote: |
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> Howdy, |
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> |
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> I mentioned in other threads that I'm doing some upgrades to my system. |
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> My first question is about a CPU upgrade. I currently have this for my |
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> CPU, from cpuinfo: |
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> |
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> AMD Phenom(tm) II X4 955 Processor |
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> |
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> Those were put there ages ago, likely when I built and installed Gentoo |
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> on this rig. Do I need to change those to something that is compatible |
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> with both CPUs and then change to the new CPU after it is installed? Or |
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> will the new CPU be close enough that it won't matter? Right now, I |
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> don't know for sure what the new CPU supports or doesn't. |
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> |
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