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    SubjectRe: BFS vs. mainline scheduler benchmarks and measurements
    On 09/08/2009 03:03 PM, Theodore Tso wrote:
    > On Tue, Sep 08, 2009 at 01:13:34PM +0300, Nikos Chantziaras wrote:
    >>> despite the untranslated content, it is clear that you have scheduler
    >>> delays (either due to scheduler bugs or cpu contention) of upto 68
    >>> msecs... Second in line is your binary AMD graphics driver that is
    >>> chewing up 14% of your total latency...
    >>
    >> I've now used a correctly installed and up-to-date version of latencytop
    >> and repeated the test. Also, I got rid of AMD's binary blob and used
    >> kernel DRM drivers for my graphics card to throw fglrx out of the
    >> equation (which btw didn't help; the exact same problems occur).
    >>
    >> Here the result:
    >>
    >> http://foss.math.aegean.gr/~realnc/pics/latop2.png
    >
    > This was with an unmodified 2.6.31-rcX kernel?

    Yes (-rc9). I also tested with 2.6.30.5 and getting the same results.


    > Does Latencytop do anything useful on a BFS-patched kernel?

    Nope. BFS does not support any form of tracing yet. latencytop runs
    but only shows a blank list. All I can say is that a BFS patched kernel
    with the same .config fixes all visible latency issues.


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