25 Apr
2008
25 Apr
'08
1:23 p.m.
On Fri, 2008-04-25 at 07:27 -0700, Ben Tartsa wrote:
Hi guys, perhaps I'm missing the point here but
the kernels linked in
a later post here:
http://packages.ubuntu.com/gutsy/linux-image-2.6.22-14-rt
http://packages.ubuntu.com/hardy/linux-image-2.6.24-16-rt
are both patched w/ the rt patchset allowing full preemption. I am
aware you can get realltime as root though its a _bad_ idea. patches
are not available for the 25 series yet. Can someone sort this out?
it is time to once again make clear some fundamentals.
* the ability to obtain SCHED_FIFO scheduling and use mlock(2) are
*COMPLETELY* separate from whether or not a kernel has been
built with Ingo's RT patches
and the corollary:
* a kernel built with Ingo's RT patches is not required to and does
not by itself ensure that a non-root user can use SCHED_FIFO
and mlock(2)
Ingo's RT patches simply make the performance of a system using
SCHED_FIFO-scheduled threads *better*. They have *absolutely nothing* to
do with whether or not a normal user can successfully execute a program
that wants to use SCHED_FIFO. that is determined by other non-kernel
elements of your system (which parts varies by distro, but primarily PAM
on most current distros).
--p