Hi, perhaps one of the maintainers mentioned at http://packages.debian.org/wheezy/linux-image-rt-686-pae could add a few notes.
On Wed, 2014-01-15 at 12:21 +1100, Zenaan Harkness wrote: > I installed the latest 3.12-1-rt-amd64 (rt) kernel, with dist-upgrade > and reboot of course. > > Reading some of the links provided in this thread, I note that > Debian's -rt kernel has: > CONFIG_HZ_250=y > # CONFIG_HZ_300 is not set > # CONFIG_HZ_1000 is not set > CONFIG_HZ=250 This might be ok if the new full no HZ features are used and unlikely will have impact to audio. For MIDI still hr timer/hpet does provide a much higher resolution than just 1000 Hz, it's 1000000000 Hz. FWIW until now no kernel-rt > 3.8 does work on my machine. [rocketmouse@archlinux ~]$ grep HZ /mnt/debi386/boot/config-3.2.0-4-rt-686-pae CONFIG_NO_HZ=y # CONFIG_HZ_100 is not set CONFIG_HZ_250=y # CONFIG_HZ_300 is not set # CONFIG_HZ_1000 is not set CONFIG_HZ=250 CONFIG_MACHZ_WDT=m [rocketmouse@archlinux ~]$ grep CONFIG_NO_HZ_FULL /mnt/debi386/boot/config-3.2.0-4-rt-686-pae Not available for this kernel version. [rocketmouse@archlinux ~]$ grep HPET /mnt/debi386/boot/config-3.2.0-4-rt-686-pae CONFIG_HPET_TIMER=y CONFIG_HPET_EMULATE_RTC=y CONFIG_HPET=y CONFIG_HPET_MMAP=y I also installed from the Debian repositories, usually I build linux-rt myself. It IMO is a bad idea to use 250 Hz since hr timer/hpet can't be used by everybody and for MIDI queue timer resolution you want at least 1000 Hz, assumed you care for lets say MIDI jitter. JFTR [rocketmouse@archlinux ~]$ grep CONFIG_NO_HZ /mnt/debi386/boot/config-3.2.0-4-rt-686-pae CONFIG_NO_HZ=y is not the same as CONFIG_NO_HZ_FULL. Next time I'll test such a 250 Hz kernel, but I will install a 1000 Hz kernel too. Regards, Ralf -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/1389751826.6024.31.camel@archlinux
