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    Subjectidle=poll burns my box [was Re: 2.6.22-rc2-mm1]
    On Wed, 23 May 2007 00:42:33 -0700, Andrew Morton <akpm@linux-foundation.org> wrote:

    >
    > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.22-rc2/2.6.22-rc2-mm1/
    >

    Don't know if it's specific to this kernel, but as I have realized it now...

    I booted with idle=poll to check some issues (with nvidia driver, btw).
    And suddenly I noticed my box was running near 80ºC hot.
    I pulled out the lid, an try to see what happened.

    In short, idle=poll rises the temperature about 20ºC.
    I have an ASUS PC-DL mobo, with a couple Xeon Northwood with HypertThreading
    at 2.4 GHz, for a total of 4 threads.

    If I boot the box with idle=poll, and let it doing _nothing_ but staring at
    the gnome desktop, I get this temperatures:
    (Time,VRM,CPU0,CPU1) (wihtout the side cover, remember...)

    15:46 64 56 54
    15:55 70 60 56
    16:02 71 62 57

    If I reboot without idle=poll, the box colds quickly:

    16:07 58 52 48
    16:12 50 43 42
    16:15 49 42 41

    I I put the box to do some multithreaded render, so all four cores stay
    above 98% usage, the box warms again:

    16:17 51 43 42
    16:24 67 57 54
    16:28 70 60 56
    16:30 72 61 57
    16:37 72 61 56

    And as soon as I stop the work, it colds again:

    16:41 71 60 56
    16:42 64 56 52
    16:43 60 54 50
    16:45 55 48 46
    16:46 53 46 44

    Left alone for awhile, it stays at 46 39 39 (for VRM and both CPUs, as I said).

    Is idle=poll a quick and dirty way to burn your box in flames ?
    To warm your cpu doing nothing ?
    Summer is coming, but this...

    Any ideas ?

    --
    J.A. Magallon <jamagallon()ono!com> \ Software is like sex:
    \ It's better when it's free
    Mandriva Linux release 2008.0 (Cooker) for i586
    Linux 2.6.21-jam03 (gcc 4.1.2 20070302 (4.1.2-1mdv2007.1)) SMP PREEMPT
    09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
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