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SubjectRe: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28
From: Ingo Molnar <>
Date: Mon, 17 Nov 2008 12:01:19 +0100

> The scheduler's overhead barely even registers on a 16-way x86 system
> i'm running tbench on. Here's the NMI profile during 64 threads tbench
> on a 16-way x86 box with an v2.6.28-rc5 kernel [config attached]:

Try a non-NMI profile.

It's the whole of the try_to_wake_up() path that's the problem.

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