linux-kernel - Re: 2.6.20-rc6-mm3

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Message-ID: <20070206212011.GA32593@elte.hu>
Date:	Tue, 6 Feb 2007 22:20:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.20-rc6-mm3


* Ingo Molnar <mingo@...e.hu> wrote:

> > I don't have that enabled tho .. This is with HRT/dynamic tick both 
> > off..
> 
> your kernel utilizes the kernel in a more optimal way: the new 
                           ^hardware                            
> clockevents code now utilizes the local APIC timer irq (represented by 
> the LOC field) for periodic interrupts. The local APIC timer irq has a 
> cost of ~2 usecs per IRQ, while the PIT irq is ~10 usecs per irq. With 
> HZ=1000 this means savings of ~8000 usecs per second - i.e. 8 msecs per 
> second, which is 0.8% more raw CPU power available - which isnt that 
> bad.

	Ingo
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