linux-kernel - Re: [rtc-linux] Re: rtc max frequency setting

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Message-ID: <20070805024155.057d051d@i1501.lan.towertech.it>
Date:	Sun, 5 Aug 2007 02:41:55 +0200
From:	Alessandro Zummo <alessandro.zummo@...ertech.it>
To:	rtc-linux@...glegroups.com
Cc:	hpa@...or.com, Jan Engelhardt <jengelh@...putergmbh.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [rtc-linux] Re: rtc max frequency setting

On Sat, 04 Aug 2007 17:06:38 -0700
"H. Peter Anvin" <hpa@...or.com> wrote:

> > with the old rtc.ko module, there was a /proc/sys/dev/rtc/max-user-freq 
> > that could be set. With rtc_cmos.ko (or the new rtc infrastructure in 
> > general), I am missing this file. Where can I set the max-user-freq now, 
> > or is this obsolete now? (mplayer prefers to have user-freq to be >= 1024.)
> > 
> 
> Qemu wants something like this too.  Both of these really want something
> else, which is a high-frequency userspace timer.
> 
> What is the best way to do that on modern kernels?

 The rtc class is missing sysfs interface to the maximum settable
 value. I guess I'll have to add it. I should be able to find the time
 in the next few days.

 However, I agree that they both shold be using an userspace
 high freq timer :)

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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