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Thread: Why the pae kernel

  1. #81
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    Talking Re: Why the pae kernel

    ? IBM Thinkpad T40 Pentium M here doesn't do Unity-3D does Unity-2D just fine. Doesn't do pae.

    Lubuntu pangolin precise pae install 20120207 working fine, see below. Some installs of precise pangolin like Alpha2 20120204 complain about no pae and stop early in boot. Others like this one running O.K.??

    Code:
    DISTRIB_RELEASE=12.04
    DISTRIB_CODENAME=precise
    DISTRIB_DESCRIPTION="Ubuntu precise (development branch)"
    Linux ThinkPad-T40 3.2.0-14-generic-pae #23-Ubuntu SMP Fri Feb 3 23:33:53 UTC 2012 i686 i686 i386 GNU/Linux
    
    model name	: Intel(R) Pentium(R) M processor 1500MHz
    Go figure. Installed, updated, removed Chromium, installed aptitude, gparted, Firefox 11.0 up and running Adobe Flash full speed just fine.

    ?

    Jerry

  2. #82
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    Re: Why the pae kernel

    Quote Originally Posted by jerrylamos View Post
    ? IBM Thinkpad T40 Pentium M here doesn't do Unity-3D does Unity-2D just fine. Doesn't do pae.

    Lubuntu pangolin precise pae install 20120207 working fine, see below. Some installs of precise pangolin like Alpha2 20120204 complain about no pae and stop early in boot. Others like this one running O.K.??

    Code:
    DISTRIB_RELEASE=12.04
    DISTRIB_CODENAME=precise
    DISTRIB_DESCRIPTION="Ubuntu precise (development branch)"
    Linux ThinkPad-T40 3.2.0-14-generic-pae #23-Ubuntu SMP Fri Feb 3 23:33:53 UTC 2012 i686 i686 i386 GNU/Linux
    
    model name	: Intel(R) Pentium(R) M processor 1500MHz
    Go figure. Installed, updated, removed Chromium, installed aptitude, gparted, Firefox 11.0 up and running Adobe Flash full speed just fine.

    ?

    Jerry
    I don't have a Pentium M, but the February 8th Lubuntu i386 daily manifest shows only pae:

    Code:
    linux-generic-pae	3.2.0.14.14
    linux-headers-3.2.0-14	3.2.0-14.23
    linux-headers-3.2.0-14-generic-pae	3.2.0-14.23
    linux-headers-generic-pae	3.2.0.14.14
    linux-image-3.2.0-14-generic-pae	3.2.0-14.23
    linux-image-generic-pae	3.2.0.14.14
    Ultimately I'm going to have to rely on those with effected hardware to deal with this.

  3. #83
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    Re: Why the pae kernel

    Quote Originally Posted by jerrylamos View Post
    ? IBM Thinkpad T40 Pentium M here doesn't do Unity-3D does Unity-2D just fine. Doesn't do pae.

    Lubuntu pangolin precise pae install 20120207 working fine, see below. Some installs of precise pangolin like Alpha2 20120204 complain about no pae and stop early in boot. Others like this one running O.K.??

    Code:
    DISTRIB_RELEASE=12.04
    DISTRIB_CODENAME=precise
    DISTRIB_DESCRIPTION="Ubuntu precise (development branch)"
    Linux ThinkPad-T40 3.2.0-14-generic-pae #23-Ubuntu SMP Fri Feb 3 23:33:53 UTC 2012 i686 i686 i386 GNU/Linux
    
    model name	: Intel(R) Pentium(R) M processor 1500MHz
    Go figure. Installed, updated, removed Chromium, installed aptitude, gparted, Firefox 11.0 up and running Adobe Flash full speed just fine.

    ?

    Jerry
    Can you run a
    Code:
    grep PAE /boot/config-3.2.0-14-generic-pae
    That'll show if PAE is actually turned on in the installed kernel. If it says CONFIG_X86_PAE=y then run a cat /proc/cpuinfo just to make sure that pae isn't listed under the flags.

  4. #84
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    Question Re: Why the pae kernel

    xyzzyman, as you requested:

    Code:
    jerry@ThinkPad-T40:~$ grep PAE /boot/config-3.2.0-14-generic-pae
    CONFIG_X86_PAE=y
    
    jerry@ThinkPad-T40:~$ cat /proc/cpuinfo
    processor	: 0
    vendor_id	: GenuineIntel
    cpu family	: 6
    model		: 9
    model name	: Intel(R) Pentium(R) M processor 1500MHz
    stepping	: 5
    microcode	: 0x7
    cpu MHz		: 600.000
    cache size	: 1024 KB
    fdiv_bug	: no
    hlt_bug		: no
    f00f_bug	: no
    coma_bug	: no
    fpu		: yes
    fpu_exception	: yes
    cpuid level	: 2
    wp		: yes
    flags		: fpu vme de pse tsc msr mce cx8 mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 tm pbe up bts est tm2
    bogomips	: 1196.18
    clflush size	: 64
    cache_alignment	: 64
    address sizes	: 36 bits physical, 32 bits virtual
    Whatever that means to someone who knows the bits. pae isn't listed.

    Jerry
    Last edited by jerrylamos; February 9th, 2012 at 01:15 AM.

  5. #85
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    Re: Why the pae kernel

    What I've been able to find, only the following CPU's are not supported by pae:

    Intel CPUs prior to Pentium II
    400Mhz Pentium M
    VIA C3
    Geode LX

    Of course I can't be sure, but I just tried an old 335mhz PII and even it works with pae

  6. #86
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    Re: Why the pae kernel

    Quote Originally Posted by kansasnoob View Post
    What I've been able to find, only the following CPU's are not supported by pae:

    Intel CPUs prior to Pentium II
    400Mhz Pentium M
    VIA C3
    Geode LX

    Of course I can't be sure, but I just tried an old 335mhz PII and even it works with pae
    Yeah, that's why they're cutting non-PAE support. You did make a mistake as it's not 400MHz Pentium M's... You got that 400MHz from the 400 MT/s FSB speed. There were some later series Pentium M's with 533 MT/s FSB's that they did re-enable the PAE/NX support.

  7. #87
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    Re: Why the pae kernel

    Quote Originally Posted by xyzzyman View Post
    Yeah, that's why they're cutting non-PAE support. You did make a mistake as it's not 400MHz Pentium M's... You got that 400MHz from the 400 MT/s FSB speed. There were some later series Pentium M's with 533 MT/s FSB's that they did re-enable the PAE/NX support.
    Oops, thanks for the correction.

  8. #88
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    Smile Re: Why the pae kernel

    "kernel requires feature pae and won't boot" shows up on some precise pangolin live boots on my 1.5 gHz Pentium M Thinkpad T40 and sometimes it doesn't. pae is not listed on the flags. pab is I have no idea what that is.

    So I try one or the other zsync of the .iso until I find one that will boot, example 20120207, even though the generic-pae shows up in /boot and the cpuinfo does not show the pae flag.

    Anyone know if the pae function is even being used on precise pangolin?

    Thanks, Jerry

    p.s. The T40 running lubuntu precise pangolin just fine, full speed video on BBC news with flash firefox (takes less disk space than chromium and I've read less memory too).

  9. #89
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    Re: Why the pae kernel

    @jerrylamos, my Atom 270 powered netbook uses the pae kernel.

  10. #90
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    Re: Why the pae kernel

    Quote Originally Posted by cariboo907 View Post
    @jerrylamos, my Atom 270 powered netbook uses the pae kernel.
    All atom's support PAE.

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