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Another Look At Intel's Lynnfield Linux Performance

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  • phoronix
    started a topic Another Look At Intel's Lynnfield Linux Performance

    Another Look At Intel's Lynnfield Linux Performance

    Phoronix: Another Look At Intel's Lynnfield Linux Performance

    Earlier this month we provided a launch-day preview of the P55 Chipset on Linux along with benchmarks from the Core i5 750 and Core i7 870, which are the new quad-core Lynnfield processors. We noticed some odd performance issues under Linux when testing out these new processors, but Intel has since chimed in and we are in the process of running an updated set of tests.

    http://www.phoronix.com/vr.php?view=14203

  • reaktor
    replied
    Originally posted by Immo View Post
    Is it safe to overclock Lynnfields despite the fact lm_sensors doesn't work?
    sudo modprobe coretemp

    Then run:

    sensors

    This module is only in the 2.6.32 kernel and newer.

    Leave a comment:


  • reaktor
    replied
    Turbo mode is back for Linux as of the 2.6.33-rc5 kernel. w00t!

    See this bug report:

    http://bugzilla.kernel.org/show_bug.cgi?id=15064

    Unfortunately the next Ubuntu version is going to be using 2.6.32. So you'll have to roll your own kernel on Ubuntu for awhile.

    Here are some of my benchmark results running that kernel on a P55 i5 750:

    http://imgur.com/7YVWo.png

    Leave a comment:


  • lem79
    replied
    I wonder when we'll see Michael re-run the tests on his hardware, see if his numbers match up with Intel's ...

    I'm assuming the Intel supplied numbers are absolute best case scenario, you wont do any better without overclocking kind of thing, and you might not be able to match the numbers at stock if you live in a place where ambient temps hang around 32C.

    Leave a comment:


  • Immo
    replied
    Is it safe to overclock Lynnfields despite the fact lm_sensors doesn't work?

    Leave a comment:


  • Immo
    replied
    If you compare AMD's Phenom II 965 and i5 which one wins when looking Linux performance in desktop use?

    Leave a comment:


  • ad_267
    replied
    Originally posted by crat3rs
    One of it's shortcomings, Hyper-Threading Technology is not present, which is needed for working with heavy multi-threaded applications.
    The i7 has hyper-threading, but the i5's don't. I'm no expert but I'd say if you've got 4 cores, that should be enough for most multi-threaded applications.

    Edit: In case anyone is wondering why I replied to a non-existent post, it turns out the post was spam.
    Last edited by ad_267; 12-26-2009, 04:38 PM.

    Leave a comment:


  • Immo
    replied
    Thanks for answers.
    So Turbo doesnt work right then?
    I understood that if single core is under load, it should be 3.2Ghz and if all cores are under load they rise at 2.8Ghz.

    I am thinking of assembling my own computer and these Lynnfields look nice, but if they dont work properly under Linux i'll pass. Should I consider i7 920 or Phenom II instead?

    And sory for my bad English....

    Leave a comment:


  • Kano
    replied
    The Turbo mode can be shown only as a +1 mhz increase of default speed with /proc/cpuinfo while 2 other cores use a lower speed state.

    Leave a comment:


  • bnolsen
    replied
    Originally posted by Immo View Post
    Is there anymore problems with p55? I havent found answer for that question. Does Turbo Mode etc. work well under linux nowdays?
    Frequency scaling doesn't seem to work. Turbo mode may...the machine is idle and reports 2.93GHz, spec is 2.80. I haven't worked with any core2 quad single socket, I can only compare to dual socket c2d's.

    Monday I'll get my hands on a pair of dual socket i7's and will do some testing on those.

    Leave a comment:

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