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Thread: GCC 4.7.0 can LTO the linux kernel

  1. #1
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    Default GCC 4.7.0 can LTO the linux kernel

    http://lwn.net/Articles/488180/
    https://github.com/andikleen/linux-misc/commits/lto

    GCC 4.7 has improved LTO and now can apparently link-time optimize the kernel. Maybe benchmark-worthy?

  2. #2
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    Default

    Quote Originally Posted by curaga View Post
    Maybe benchmark-worthy?
    Nope. The kernel consumes the least amount of CPU time to begin with.

  3. #3
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    In some cases (like properly built http servers) there is a huge amount of work in kernelspace, in fact the more the better.

    In any case, a smaller kernel = better cache usage, measuring this would be nice too.

  4. #4

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    Sys time is very hurge in desktop and server case. n some case better speed = low latency = less user space thread blocked = more performance.
    On my server, the kernel time is always at more than 25%.

    I'm very interested by benchmark and details for this.

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