Re: rtc max frequency setting

[Jan Engelhardt <jengelh@computergmbh.de>]

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
-- 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/