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Thread: Possible reason for higher Intel CPU temps

  1. #1
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    Possible reason for higher Intel CPU temps

    I happened to read this a couple hours ago:

    http://www.phoronix.com/scan.php?pag...tem&px=MTUzODc

    Intel Developer Finds 50 Watt Power Regression In Linux
    I had noticed in both Trusty and Saucy that my Intel Atom 230 ran a full 20 degrees Fahrenheit warmer than in previous versions of Ubuntu (and flavors) but I never could find a process that was consuming more resources. So, after reading that, I busted out my P3 Kill-A-Watt and sure as heck - at idle I'm still consuming nearly 17 watts in Trusty @idle whereas in Precise I'm consuming less than 3 watts

  2. #2
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    Re: Possible reason for higher Intel CPU temps

    1. Put in kernel boot command-line
    Code:
    idle=mwait
    2. After boot do
    Code:
    dmesg|grep idle
    3. With
    Code:
    uname -srvmpio
    post Your result(s).
    I'm trying to see what kernel do honor mwait since I'm using poll for least latency with
    Code:
    intel_idle.max_cstate=0 processor.max_cstate=0
    Thank You.

  3. #3
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    Re: Possible reason for higher Intel CPU temps

    Quote Originally Posted by zika View Post
    1. Put in kernel boot command-line
    Code:
    idle=mwait
    2. After boot do
    Code:
    dmesg|grep idle
    3. With
    Code:
    uname -srvmpio
    post Your result(s).
    I'm trying to see what kernel do honor mwait since I'm using poll for least latency with
    Code:
    intel_idle.max_cstate=0 processor.max_cstate=0
    Thank You.
    It may be a day or two until I get around to that

    Just lots of cold weather projects stacking up here.

  4. #4
    Join Date
    Aug 2012
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    50

    Re: Possible reason for higher Intel CPU temps

    Isn't this problem related to the new intel p_state cpu governor. When using it, my cpu never idles to 800mhz and idles at 3.5ghz instead. Ubuntu doesn't enable intel p_state by default.
    Intel 4770k + ASUS Z87 PRO + 8GB + AMD R9 290X

  5. #5
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    Re: Possible reason for higher Intel CPU temps

    Quote Originally Posted by zika View Post
    1. Put in kernel boot command-line
    Code:
    idle=mwait
    2. After boot do
    Code:
    dmesg|grep idle
    3. With
    Code:
    uname -srvmpio
    post Your result(s).
    I'm trying to see what kernel do honor mwait since I'm using poll for least latency with
    Code:
    intel_idle.max_cstate=0 processor.max_cstate=0
    Thank You.
    Sorry for the delay, hope I did this right:

    Code:
    lance@lance-desktop:~$ dmesg|grep idle
    [    0.000000] Malformed early option 'idle'
    [    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.12.0-7-generic root=UUID=f49bbc53-3369-47cf-89ae-c25795762898 idle=mwait
    [    0.000000] 	RCU dyntick-idle grace-period acceleration is enabled.
    [    0.106297] cpuidle: using governor ladder
    [    0.106340] cpuidle: using governor menu
    [    1.129214] intel_idle: MWAIT substates: 0x10
    [    1.129233] intel_idle: v0.4 model 0x1C
    [    1.129239] intel_idle: lapic_timer_reliable_states 0x2
    lance@lance-desktop:~$ uname -srvmpio
    Linux 3.12.0-7-generic #15-Ubuntu SMP Sun Dec 8 23:42:09 UTC 2013 i686 i686 i686 GNU/Linux

  6. #6
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    Re: Possible reason for higher Intel CPU temps

    ..
    Last edited by PJs Ronin; December 11th, 2013 at 07:54 AM.

  7. #7
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    Re: Possible reason for higher Intel CPU temps

    I'm not seeing this anymore since upgrading to 3.13.0-6-generic

  8. #8
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    Re: Possible reason for higher Intel CPU temps

    Quote Originally Posted by pnarciso View Post
    Isn't this problem related to the new intel p_state cpu governor. When using it, my cpu never idles to 800mhz and idles at 3.5ghz instead. Ubuntu doesn't enable intel p_state by default.
    that is not how intel_pstate works
    the clock speed changes dynamically for every 1% from 800MHz to 3.5GHz
    here is a chart generating script to show you the clock speeds over time using intel_pstate
    http://pastebin.com/PYj4wwCj
    requires php5-cli be installed
    Laptop: ASUS A54C-NB91 (Storage: WD3200BEKT + MKNSSDCR60GB-DX); Desktop: Custom Build - Images included; rPi Server
    Putting your Networked Printer's scanner software to shame PHP Scanner Server
    I frequently edit my post when I have the last post

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