On Sat, 2007-07-21 at 22:26 +1000, James Cameron wrote: > On Sat, Jul 21, 2007 at 02:03:19PM +0200, Atte Andr? Jensen wrote: > > Whereas on debian I would get: > > > > atte@ajstrup:~$ ps aux | grep IRQ > > root 18 0.2 0.0 0 0 ? S< 13:34 0:00 [IRQ 9] > > Which kernel version is this? Homemade (with mingo rt-patch) 2.6.18-rt7 2.6.20-16-lowlatency > On Debian, I get ksoftirqd as well, one > per processor core. ksoftirqd is part of the 2.6 kernel series. I > imagine you're still using a 2.4 kernel on your Debian system, Nope... > or the > kernel is configured and built differently to mine. Might be... > It may be possible to rebuild the Ubuntu kernel you are using to match > what you are used to, but I don't know if that will get you what you > want. I grabbed a vanilla 2.6.22.1 and applied the latest patch and quick testing seems to suggest that the system is running at least at well as under debian: atte@ajstrup:~$ uname -r 2.6.22.1-rt4 atte@ajstrup:~$ ps aux | grep IRQ root 36 0.0 0.0 0 0 ? S< 18:15 0:00 [IRQ-9] root 268 0.0 0.0 0 0 ? S< 18:16 0:00 [IRQ-4] root 292 0.0 0.0 0 0 ? S< 18:16 0:00 [IRQ-12] root 293 0.0 0.0 0 0 ? S< 18:16 0:00 [IRQ-1] root 1108 0.0 0.0 0 0 ? S< 18:16 0:00 [IRQ-14] root 1139 0.0 0.0 0 0 ? S< 18:16 0:00 [IRQ-15] root 1140 0.2 0.0 0 0 ? S< 18:16 0:02 [IRQ-11] root 1936 0.0 0.0 0 0 ? S< 18:16 0:00 [IRQ-8] root 2025 0.0 0.0 0 0 ? S< 18:16 0:00 [IRQ-7] root 2103 0.3 0.0 0 0 ? S< 18:16 0:03 [IRQ-10] root 3432 0.0 0.0 0 0 ? S< 18:16 0:00 [IRQ-3] atte 4674 0.0 0.0 2888 772 pts/2 R+ 18:33 0:00 grep IRQ > I've never tried setting real-time priority on kernel threads > like that, and I don't know if it would achieve anything. I trust it > did for you? Alot! Bottom line: It seems it's still necessary to roll your own kernel to get optimal realtime performance under ubuntu :-( -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://atte.dk/compositions _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
