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Tarball
Tux's lil' helper
Joined: 19 Jun 2002
Posts: 142
Location: Cheshire, UK
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 Posted: Wed Feb 12, 2003 7:09 pm Post subject: Moving from Intel CPU to AMD CPU |
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Hi,
I recently bought an AMD 1800XP CPU and Elite K7S5A MoBo to replace my aging Dual 466 Celeron and ABIT BP6 MoBo.
I have installed the new mobo and cpu, and I have just attached the drives to the new mobo.
I now have a couple of questions,
Firstly, I have noticed the the system is not particularly stable especially running X. I have recompiled the kernel and modules but the rest of the system is still running executables compiled with CFLAGS="-march=pentium2 -O3" so I this the likely cause of the instability??
Secondly, I now obviously want to compile the system with CFLAGS for my Athlon processor, so how can I force a recompilation of my entire system (I don't mind if I have to leave it working a couple of days) or is there an easy(-ish) way to perform a stage 1 install without a complete reformat??
Ok I just gotta sneak in a third one, would it be better to just compile my kernel with Althon optimisations and then compile the rest of the system optimised for i686 architechure? I don't intend to change the system for a while now but would this make it easier to switch between x86 processors and would this have any large detrimental effect on performance over compiling with althon optimisations???
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bsolar
Bodhisattva
Joined: 12 Jan 2003
Posts: 2764
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| Posted: Wed Feb 12, 2003 7:31 pm Post subject: |
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To recompile your system do .
After compilation with the right flags it should be stable.
I'd recompile everything with the better optimization but's just me... I don't think the performance gain is very high but I don't have numbers.
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I may not agree with what you say, but I'll defend to the death your right to say it. |
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Malakin
Veteran
Joined: 14 Apr 2002
Posts: 1692
Location: Victoria BC Canada
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| Posted: Wed Feb 12, 2003 8:48 pm Post subject: |
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| Quote: | | I don't intend to change the system for a while now but would this make it easier to switch between x86 processors and would this have any large detrimental effect on performance over compiling with althon optimisations? |
Performance loss is about 8% according to the gcc folks.
If you wanted the option of running the same system on different cpu's you could use "-march=i686 -mcpu=athlon-xp" which would perform cpu scheduling optimizations for an Athlon XP but would keep cpu compatability with i686. Doing this you wouldn't be compiling with 3dnow or sse (usually not a big deal though).
| Quote: | | so I this the likely cause of the instability?? |
I doubt it, test your memory first (test with the case on at full operating temperature)
http://www.memtest86.com/
You could drop to O2 if you continue to have problems and your memory tests fine. If you do get memory errors up the voltage 0.1 if you can with that motherboard and restest it, usually fixes it. |
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Kernel & Hardware
