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    SubjectRe: Scheduling latencies news: less RAM = less latency

    On Sat, 31 Jul 1999, Linus Torvalds wrote:

    > prune_dcache() I can believe. But the report was about d_lookup(). So
    > somebody is using bad profiling information, and that's dangerous.

    sure - d_lookup() is definitely bogus.

    > Also, the si_meminfo() etc stuff is just ridiculous. It's not a question
    > of latency: it's a question of CPU usage. We need to just get rid of
    > those functions instead of hacking around them - regardless of whether
    > you add "reschedule" calls in them, they just eat too much CPU, plain
    > and simple. Again, please don't treat the symptoms - I will not accept
    > patches that just say "oh, this is crap, so let's reschedule a bit
    > here". They need to be fixed properly or not at all.

    i agree - I wanted to have something for 2.2 for people to test - i wanted
    to cure symptoms first, we have way too many latency sources right now and
    i first wanted to get something that can be tested. I think that the
    uaccess.h changes are too intrusive as well - i'll rework these things.

    Ingo


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