linux-kernel - Re: [PATCH] HZ: 300Hz support

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Message-ID: <p73zmazitru.fsf@bingen.suse.de>
Date:	10 Nov 2006 09:35:17 +0100
From:	Andi Kleen <ak@...e.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HZ: 300Hz support

Alan Cox <alan@...rguk.ukuu.org.uk> writes:

> Fix two things. Firstly the unit is "Hz" not "HZ". Secondly it is useful
> to have 300Hz support when doing multimedia work. 250 is fine for us in
> Europe but the US frame rate is 30fps (29.99 blah for pedants). 300
> gives us a tick divisible by both 25 and 30, and for interlace work 50
> and 60. It's also giving similar performance to 250Hz.
> 
> I'd argue we should remove 250 and add 300, but that might be excess
> disruption for now.

If we go down that path I would like to have 256.

Why? There are still lots of systems with broken Interrupt 0 routing
and usually on those the RTC works just fine. But unfortunately RTC
can be only programmed to power of two frequencies. 256 would fit.

-Andi
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