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author | diego <diego@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-06-30 22:10:47 +0000 |
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committer | diego <diego@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-06-30 22:10:47 +0000 |
commit | ed940993c89d18129a2b932e0967d59269f34db6 (patch) | |
tree | 2aa245e0e1f607cef97156dd8528acbcca881c8b /DOCS/documentation.html | |
parent | 307eeeeba81b46de6580b2fdb3ebdaa4d3c489c2 (diff) | |
download | mpv-ed940993c89d18129a2b932e0967d59269f34db6.tar.bz2 mpv-ed940993c89d18129a2b932e0967d59269f34db6.tar.xz |
further updates for RTC
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6618 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'DOCS/documentation.html')
-rw-r--r-- | DOCS/documentation.html | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/DOCS/documentation.html b/DOCS/documentation.html index 1402623972..5451cb2441 100644 --- a/DOCS/documentation.html +++ b/DOCS/documentation.html @@ -664,25 +664,37 @@ encode movies with <B>MPlayer</B>, read the <A HREF="#2.5">TV input</A> section. <CODE>usleep()</CODE> to tune A/V sync, with +/- 10ms accuracy. However sometimes the sync has to be tuned even finer.</LI> <LI><B>The new timer</B> code uses PC's RTC (Real Time Clock) for this task, - because it has precise 1ms timers. This requires root privileges, or a - <I>setuid root</I> <B>MPlayer</B> binary. If you are running kernel - 2.4.19pre8 or later you can adjust the maximum RTC frequency for normal - users through the <CODE>/proc</CODE> filesystem. Use this command to enable - RTC for normal users: + because it has precise 1ms timers. It is automagically enabled when + available, but requires root privileges, a <I>setuid root</I> + <B>MPlayer</B> binary or a properly set up kernel. + <BR> + If you are running kernel 2.4.19pre8 or later you can adjust the maximum + RTC frequency for normal users through the <CODE>/proc</CODE> filesystem. + Use this command to enable RTC for normal users: <P> - <CODE>echo 1025 > /proc/sys/dev/rtc/max-user-freq</CODE> + <CODE>echo 1024 > /proc/sys/dev/rtc/max-user-freq</CODE> </P> If you do not have such a new kernel, you can also change one line in - <CODE>drivers/char/rtc.c</CODE> and recompile your kernel. Find the line - <P> - <CODE>if ((rtc_freq > 64) && (!capable(CAP_SYS_RESOURCE)))</CODE> - </P> + <CODE>drivers/char/rtc.c</CODE> and recompile your kernel. Find the + section that reads + <PRE> + * We don't really want Joe User enabling more + * than 64Hz of interrupts on a multi-user machine. + */ + if ((rtc_freq > 64) && (!capable(CAP_SYS_RESOURCE))) + </PRE> and change the 64 to 1024. You should really know what you are doing, though. <BR> - You can see the new timer's efficiency in the status line. In some hardware - combinations (confirmed during usage of non-DMA DVD drive on an ALi1541 board) - usage of the RTC timer causes skippy playback. It's recommended to use the - following method in these cases.</LI> + You can see the new timer's efficiency in the status line. + <BR> + The power management functions of some notebook BIOSes with speedstep CPUs + interact badly with RTC. Audio and video may get out of sync. Plugging the + external power connector in before you power up your notebook seems to help. + You can always turn off RTC support with the <CODE>-nortc</CODE> switch. + In some hardware combinations (confirmed during usage of non-DMA DVD + drive on an ALi1541 board) usage of the RTC timer causes skippy playback. + + It's recommended to use the following method in these cases.</LI> <LI><B>The third timer code</B> is turned on with the <CODE>-softsleep</CODE> option. It has the efficiency of the RTC, but it doesn't use RTC. On the other hand, it requires more CPU.</LI> @@ -690,7 +702,7 @@ encode movies with <B>MPlayer</B>, read the <A HREF="#2.5">TV input</A> section. </LI> </UL> -Note: <B>NEVER install setuid MPlayer binary on a +Note: <B>NEVER install a setuid root MPlayer binary on a multiuser system!</B> It's a clear way for everyone to gain root. |