On Sat, Nov 15, 2003 at 05:12:45PM +0000, James Stone wrote: > On Tue, Nov 11, 2003 at 09:13:58PM +0000, James Stone wrote: > > Hello everyone. > > > > I have a problem with midi timing.. I think I have set up enhanced rtc > > correctly and low latency patch on kernel 2.4.20. > > > > When I drive hydrogen (or even the inbuilt soundfont player on my > > SBLive) with seq24 or ardour, there is a noticable variation in midi > > timing. This was tested by using a run of closed hihats. When I play the > > sequence back, the hihats are grouped in batches rather than being > > evenly spaced. This was noticable when running as root and when using > > alsa and (to a lesser extent) jack. The midi connection is via alsa. > > > > Any hints on what I should do? > > > > James > > Just to reply to myself, > > I solved the problem: > > I needed to install the snd-rtctimer for alsa. This required a patch to > the kernel RTC (patch included with ALSA but also needed a tweak. see: > > http://www.geocrawler.com/archives/3/12349/2001/7/0/6299315/ So... you got the rtc patch to apply on kernel 2.4.20??? Are you using vanilla kernel sources with low-latency patch? It fails for me :-( I am using gentoo "gaming-sources" for 2.4.20, which have preemptible and lowlat patches already applied. I get three rejects (one in the makefile as described in that message), two in rtc.c which are trivial to fix by hand... but then "make modules" fails on rtc.c: make[2]: Entering directory `/usr/src/linux-2.4.20-gaming-r3/drivers/char' gcc -D__KERNEL__ -I/usr/src/linux-2.4.20-gaming-r3/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer -pipe -mpreferred-stack-boundary=2 -march=i686 -DMODULE -DMODVERSIONS -include /usr/src/linux-2.4.20-gaming-r3/include/linux/modversions.h -nostdinc -iwithprefix include -DKBUILD_BASENAME=rtc -DEXPORT_SYMTAB -c rtc.c rtc.c:150: redefinition of `rtc_task_lock' rtc.c:145: `rtc_task_lock' previously defined here rtc.c:151: redefinition of `rtc_callback' rtc.c:146: `rtc_callback' previously defined here rtc.c:591: redefinition of `rtc_do_ioctl' rtc.c:296: `rtc_do_ioctl' previously defined here rtc.c:780: redefinition of `__kstrtab_rtc_register_Rsmp_fdab2b9c' rtc.c:698: `__kstrtab_rtc_register_Rsmp_fdab2b9c' previously defined here rtc.c:780: redefinition of `__ksymtab_rtc_register_Rsmp_fdab2b9c' rtc.c:698: `__ksymtab_rtc_register_Rsmp_fdab2b9c' previously defined here rtc.c:781: redefinition of `__kstrtab_rtc_unregister_Rsmp_eddfe49d' rtc.c:699: `__kstrtab_rtc_unregister_Rsmp_eddfe49d' previously defined here rtc.c:781: redefinition of `__ksymtab_rtc_unregister_Rsmp_eddfe49d' rtc.c:699: `__ksymtab_rtc_unregister_Rsmp_eddfe49d' previously defined here rtc.c:782: redefinition of `__kstrtab_rtc_control_Rsmp_c9b27289' rtc.c:700: `__kstrtab_rtc_control_Rsmp_c9b27289' previously defined here rtc.c:782: redefinition of `__ksymtab_rtc_control_Rsmp_c9b27289' rtc.c:700: `__ksymtab_rtc_control_Rsmp_c9b27289' previously defined here rtc.c:785: redefinition of `rtc_register_Rsmp_fdab2b9c' rtc.c:703: `rtc_register_Rsmp_fdab2b9c' previously defined here rtc.c:811: redefinition of `rtc_unregister_Rsmp_eddfe49d' rtc.c:729: `rtc_unregister_Rsmp_eddfe49d' previously defined here rtc.c:843: redefinition of `rtc_control_Rsmp_c9b27289' rtc.c:761: `rtc_control_Rsmp_c9b27289' previously defined here rtc.c:145: warning: `rtc_task_lock' defined but not used rtc.c:146: warning: `rtc_callback' defined but not used rtc.c:296: warning: `rtc_do_ioctl' defined but not used {standard input}: Assembler messages: {standard input}:58: Error: symbol `rtc_task_lock' is already defined {standard input}:63: Error: symbol `rtc_callback' is already defined {standard input}:189: Error: symbol `__kstrtab_rtc_register_Rsmp_fdab2b9c' is already defined {standard input}:196: Error: symbol `__ksymtab_rtc_register_Rsmp_fdab2b9c' is already defined {standard input}:203: Error: symbol `__kstrtab_rtc_unregister_Rsmp_eddfe49d' is already defined {standard input}:210: Error: symbol `__ksymtab_rtc_unregister_Rsmp_eddfe49d' is already defined {standard input}:217: Error: symbol `__kstrtab_rtc_control_Rsmp_c9b27289' is already defined {standard input}:224: Error: symbol `__ksymtab_rtc_control_Rsmp_c9b27289' is already defined make[2]: *** [rtc.o] Error 1 make[2]: Leaving directory `/usr/src/linux-2.4.20-gaming-r3/drivers/char' make[1]: *** [_modsubdir_char] Error 2 make[1]: Leaving directory `/usr/src/linux-2.4.20-gaming-r3/drivers' make: *** [_mod_drivers] Error 2 Any clues? -- Paul Winkler http://www.slinkp.com Look! Up in the sky! It's IAMBIC HEART PROFESSOR! (random hero from isometric.spaceninja.com)
