linux-kernel - Re: Scheduler regression: Too frequent timer interrupts(?)

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Message-ID: <alpine.DEB.1.10.0904281700220.15947@qirst.com>
Date:	Tue, 28 Apr 2009 17:02:16 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Pavel Machek <pavel@....cz>
cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: Scheduler regression: Too frequent timer interrupts(?)

On Thu, 23 Apr 2009, Pavel Machek wrote:

> I'd say that taking interrupt and returning in below 1000nsec is
> impossible, even on very fast hw.

Hmmm.... Could it be that CONFIG_NO_HZ caused the timer interrupt to be
avoided in earlier releases? NO_HZ theory at least is to only schedule
interrupts when  necessary. So an interrupt is needed at the end of the
scheduling intervals and not at HZ frequency.

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