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Greetings, |
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Just to give this another perspective. |
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On Wednesday, May 12, 2004, at 08:58 AM, Kevin wrote: |
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> On Wednesday 12 May 2004 07:48, Josh Glover wrote: |
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>> Quoth Kevin (Wed 2004-05-12 07:24:07AM -0400): |
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>>> |
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>>> Have you turned off hyperthreading? Why is it that only two CPUs |
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>>> show up? It looks like (flags include ht) the CPUs support |
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>>> hyperthreading... or am I way off base in drawing that conclusion |
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>>> here? |
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>> |
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>> No, the only part where you went off base was in assuming that I have |
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>> more than one *physical* CPU in the box. I have one, and with |
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>> hyperthreading turned on, it looks like two to the kernel. |
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> |
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> Oh.... Well, that seems like an important difference between yours |
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> and my |
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> arrangements. Are you running Gentoo on a box with more than one |
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> physical CPU? I had no problems running Gentoo on this box until after |
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> installing a second CPU. That's when the weirdness started. |
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> |
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> Is anyone here running Gentoo on a dual-physical CPU machine? What |
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> compiler flags are you using? |
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All my ppc64 hardware is SMP, and runs gentoo just fine. I suspect you |
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have some |
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specific intel-ish problem. Could be BIOS or any other variety of |
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problems. |
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|
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>>> CFLAGS="-O3 -march=pentium4 -pipe -fomit-frame-pointer" |
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>> |
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>> Might want to back off to -O2, at least when you compile the kernel if |
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>> nothing else. I believe the handbook recommends -O2, and optimising |
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>> too |
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>> highly can lead to some pretty bizarre problems. |
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> |
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> K. What CFLAGS are you using? (on both your single physical CPU box |
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> you |
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> described above and with any multiple physical CPU boxes) |
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CFLAGS="-O3 -mtune=power3 or -mtune=g5 " or just -mcpu=powerpc64 |
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|
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>>> MAKEOPTS="-j3" |
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>> |
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>> You have four CPUs, so set this to -j5. |
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> |
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> I was thinking "number of physical CPUs + 1" here, but ok. |
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I generally set to number of physical CPUs x 2. For HMT systems (which |
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include certain ppc64 boxes as well) number of physical CPUs x 4 is |
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fine. |
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Regards, |
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|
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Tom |
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|
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Tom Gall |
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gentoo-ppc64 lead -- God started with stage 1, shouldn't you? |
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tgall aatt gentoo.org |
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tgall aatt uberh4x0r.org |
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tom_gall aatt mac.com |
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|
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-- |
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