Messages in this thread | | | Date | Sun, 11 May 2008 16:32:27 +0200 | From | Ingo Molnar <> | Subject | Re: [git pull] scheduler fixes |
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* Matthew Wilcox <matthew@wil.cx> wrote:
> > the gain is rather obvious: two parallel up()s (or just up()s which > > come close enough after each other) will wake up two tasks in > > parallel. With your patch, the first guy wakes up and then it wakes > > up the second guy. I.e. your patch serializes the wakeup chain, mine > > keeps it parallel. > > Yup. I explained why that's actually beneficial in an earlier email.
but the problem is that by serializing the wakeup chains naively you introduced a more than 50% AIM7 performance regression.
Ingo
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