Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

David Miller
2008-11-17T19:21:57Z

From: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
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.