From: Willy Tarreau <w@1wt.eu>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Re: [PATCH] HZ: 300Hz support
Date: Wed, 8 Nov 2006 23:39:24 +0100 [thread overview]
Message-ID: <20061108223924.GA589@1wt.eu> (raw)
In-Reply-To: <1163018557.23956.92.camel@localhost.localdomain>
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
next prev parent reply other threads:[~2006-11-08 22:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-08 20:42 [PATCH] HZ: 300Hz support Alan Cox
2006-11-08 20:48 ` Arjan van de Ven
2006-11-08 21:12 ` Alan Cox
2006-11-08 21:01 ` Jiri Slaby
2006-11-08 22:39 ` Willy Tarreau [this message]
2006-11-10 8:35 ` Andi Kleen
2006-11-10 12:10 ` Jan Engelhardt
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