linux-kernel - Re: rtc max frequency setting

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Message-ID: <Pine.LNX.4.64.0708050956540.29913@fbirervta.pbzchgretzou.qr>
Date:	Sun, 5 Aug 2007 10:05:50 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	rtc-linux@...glegroups.com
Subject: Re: rtc max frequency setting


On Aug 4 2007 17:06, H. Peter Anvin wrote:
>Jan Engelhardt wrote:
>> Hi,
>> 
>> 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.

Something like that. They use it to fire the virtual timer (RTC in
the guest), otherwise there is no way to simulate a HZ=1000 guest
(esp. Freebsd 6.0) in a HZ=100 host without busy-waiting.

For mplayer it is not that important (I'd even ask "what for?" since
other players do not need it either by default).

>What is the best way to do that on modern kernels?
>
>	-hpa
>

	Jan
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