On March 8, 2005 03:50 pm, quoth Dubphil: I asked this question on the gentoo-users list and apparently if I put options realtime gid=18 mlock=1 into /etc/modules.d/realtime that should do the trick. I'll try it out tomorrow. Robert. -- Robert Persson "No matter how much ye shake yer peg The last wee drap rins doon yer leg."

james(a)dis-dot-dat.net writes: It enables programs to lock memory using the mlock() and mlockall() system calls. Since mlock=1 is the default, leaving it off has no effect. If you don't need to lock memory, setting mlock=0 will remove that capability. BTW, I recommend using the `gid' option instead of `any'. It provides noticeably better security for very little extra effort. -- joq

"Andreas Kuckartz" <A.Kuckartz(a)ping.de> writes: Often it makes no difference at all. That's why it's an option. :-) Programs like JACK ordinarily try to lock memory when running with the --realtime option to prevent data accessed by realtime-critical code being paged out. If that happens XRUNS will surely ensue, but it usually doesn't because these pages tend to be accessed regularly enough to escape the VM page replacement algorithm. But, without mlock(), there is no guarantee. If you decide to specify mlock=0, you should probably also specify the `jackd -m' (--no-mlock) option. -- joq

Thanks very much to everybody who has been helping me with this problem. I can now confirm that the way to get realtime-lsm working on Gentoo (with a 2.6 kernel) is to put the line options realtime gid=n (where n is the numeric id of the group to be allowed realtime scheduling) into /etc/modules.d/realtime, and to put the line realtime into /etc/modules.autoload.d/kernel-2.6 if you want the realtime module loaded at startup. For those who don't know, the numeric id of the group will be listed in /etc/group. I used the kde control center put user 'robert' into group 'audio' and I give audio (numeric id = 18) realtime priveleges. You could if you wanted create a special group called 'realtime'. That would make sense if you were also doing non-audio things that needed realtime priveleges, such as microsurgery. Run modules-update and then run "modprobe realtime" if you want to get it going without a reboot. And the mlock=1 option is indeed the default and doesn't need to be specified. Wasn't mlock how they killed Socrates? Robert. -- Robert Persson "No matter how much ye shake yer peg The last wee drap rins doon yer leg."