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

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Message-ID: <20061108223924.GA589@1wt.eu>
Date:	Wed, 8 Nov 2006 23:39:24 +0100
From:	Willy Tarreau <w@....eu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: [PATCH] HZ: 300Hz support

On Wed, Nov 08, 2006 at 08:42:37PM +0000, Alan Cox wrote:
> 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.

I'd like to keep 250 for a simple reason : the period is an integer
number of milliseconds. I find it very convenient to be able to convert
jiffies to ms. It serves at several places, for instance, poll(). In
fact, what I like with 250 is that there is no divide between ms and
jiffies, but just a bit shift.

Regards,
Willy

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