Re: AIM7 40% regression with 2.6.26-rc1

[Andrew Morton]

On Wed, 07 May 2008 16:57:52 +0200 Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> Or figure out what made the semaphore consolidation slower? As Ingo
> pointed out earlier 40% is unlikely to be a fast path problem, but some
> algorithmic problem. Surely that is fixable (even for .26)?

Absolutely.  Yanmin is apparently showing that each call to __down()
results in 1,451 calls to schedule().  wtf?

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