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    SubjectRe: very poor performance in 2.5.66[-mm1]
    David Mansfield wrote:
    > Hi list.
    >
    > After all of the rave reviews about the interactivity fixes (both regular
    > and I/O scheduler related), I decided to give the 2.5.latest a try on my
    > desktop machine (system described below)
    >
    > I started X, everything seemed fine, maybe a bit faster. I opened a
    > 'gnome-terminal' and typed 'ls -ltr'. Wow, it was 20x slower.
    >
    > Here are the timings for 'ls -ltr':
    >
    > 2.5.66-mm1: 'ls -ltr' 31 seconds
    > 2.5.66-mm1: 'ls -ltr | cat' 2 seconds
    > 2.4.18-rhlatest: 'ls -ltr' 1.14 seconds

    I've noticed this on all kernels and it seems scheduling related
    hence why the latest triggers it for you. As far as I can see
    most times writing data to gnome-terminal WHICH CAUSES IT TO SCROLL
    it takes a ridiculous amount of time. If I take some CPU time away
    from gnome-terminal by the official "window wiggling" method it
    runs much faster. Note it's not rendering (antialiasing) related
    as I turned that off with the same effect.

    Pádraig.

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